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Extrinsic stains and management: A new insight



Tooth discoloration is a frequent dental finding associated with clinical and esthetic problems. It differs in etiology, appearance, composition, location and severity. Knowledge of the etiology of tooth staining is of importance to dental surgeons in order to enable a correct diagnosis. The practitioners should also have the basic understanding of the mechanism of stain formation before carrying out any treatment procedures which will facilitate better treatment outcomes. Recently there have been advancements in the various treatment options in this field. This article is a comprehensive review on extrinsic stains and the treatment modalities.
J. Acad. Indus. Res. Vol. 1(8) January 2013 435
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
ISSN: 2278-5213
Extrinsic stains and management: A new insight
Sruthy Prathap, H. Rajesh, Vinitha. A. Boloor and Anupama. S. Rao
Dept. of Periodontics, Yenepoya Dental College, Nithyananda Nagar Post, Deralakatte, Mangalore-575018, Karnataka, India; +91 9980433489
Tooth discoloration is a frequent dental finding associated with clinical and esthetic problems. It differs in
etiology, appearance, composition, location and severity. Knowledge of the etiology of tooth staining is of
importance to dental surgeons in order to enable a correct diagnosis. The practitioners should also have the
basic understanding of the mechanism of stain formation before carrying out any treatment procedures which
will facilitate better treatment outcomes. Recently there have been advancements in the various treatment
options in this field. This article is a comprehensive review on extrinsic stains and the treatment modalities.
Keywords: Tooth discoloration, esthetic problems, tooth staining, treatment outcomes, extrinsic stains.
It is widely recognized that today’s youth and
appearance oriented culture prizes an attractive smile
and white teeth, with sales of whitening products rising
dramatically in the past decade. Some of these products
are sold as ‘over the counter products’ and have no
professional involvement in their application. The correct
diagnosis for the cause of color discoloration is important
as, invariably, it has profound effect on treatment
outcomes. It would seem reasonable, therefore that
dental practitioners have an understanding of the
etiology of tooth color discoloration in order to make a
diagnosis and enable the appropriate treatment to be
carried out (Aryan, 2005). Dental stains differ in etiology,
appearance, composition, location, severity and degree
of adherence. Attraction of material to the tooth surface
plays a critical role in the deposition of extrinsic dental
stains. However the mechanism that determines the
adhesion strength is not completely understood (Tirth et
al., 2009).
Normal variations in tooth color: A basic understanding of
the elements of tooth color is important for many aspects
in dentistry. Teeth are typically composed of various
colors and a gradation of color occurs in an individual
tooth from gingival margin to the incisal edge of the
tooth. Near the gingival margin, tooth often has a darker
appearance because of close approximation of the
dentine below the enamel. In most people canine teeth
are darker than central and lateral incisors and young
people characteristically have lighter teeth, particularly in
the primary dentition. Teeth become darker as a
physiological age change; this may be partly caused by
laying down of secondary dentin, incorporation of
extrinsic stains and gradual wear of enamel allowing a
greater influence on color of the underlying dentine. Also
and tooth wear and gingival recession can directly or
indirectly affect tooth color. The science of color is
important in dentistry with regard to color perception and
description, and can be improved with training.
The viewing conditions are extremely important and
variables such as the light source, time of day,
surrounding conditions and the angle of tooth viewed
affects the apparent tooth color. Light is composed of
differing wavelengths and the same tooth viewed under
different conditions will exhibit a different color, a
phenomenon known as metamerism (Watts and Addy,
Classification of tooth discoloration
Intrinsic discoloration: Intrinsic discoloration occurs
following a change to the structural composition or
thickness of the dental hard tissues. The normal color of
teeth is determined by the blue, green and pink tints of
the enamel and is reinforced by the yellow through the
brown shades of dentine beneath. A number of metabolic
diseases and systemic factors are known to affect the
developing dentition and cause discoloration as a
consequence. Local factors such as injury are also
1. Alkaptonuria.
2. Congenital erythropoietic porphyria.
3. Congenital hyperbilirubinaemia.
4. Amelogenesis imperfect.
5. Dentinogenesis imperfect.
6. Tetracycline staining.
7. Fluorosis.
8. Enamel hypoplasia.
9. Pulpal haemorrhagic products.
10. Root resorption.
11. Ageing.
Extrinsic discoloration: Extrinsic color discoloration is
outside the tooth substance and lies on the tooth surface
or in the acquired pellicle.
The origin of the stain may be:
1. Metallic.
2. Non-metallic.
J. Acad. Indus. Res. Vol. 1(8) January 2013 436
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
Table 1. Types of stains, source, appearance and common sites.
Types of stains Source and predisposing factors Appearance on the tooth surface Common sites
Brown stain
The color is due to tannin. Intake of coffee
and tea. Causes-insufficient brushing.
Inadequate cleansing action of dentifrice.
Chromogenic bacteria.
Thin, translucent, acquired
bacteria free pigment pellicle.
(1) Buccal surface of
maxillary molars.
(2) Lingual surface of
mandibular incisors.
Black stain
(1) Coal tar combustion products due to
(2) Penetration of pits and fissures, enamel
and dentine by tobacco juices.
Iron containing oral solutions.
Exposure to iron, manganese, silver.
These are tenacious dark brown
or black with brown
(1)Involves all the teeth.
(2) Common on pits and
Black stain
More common in woman, may occur in
excellent oral hygiene. High tendency for
(1) Associated with low incidence of caries
in children.
(2) Chromogenic bacteria-e.g. Gram
positive rods-Actimomyces species
Bacteriodes melaninogenicus.
Iron containing oral solutions.
This is a thin black line, firmly
attached on tooth surface.
(1) Near the gingival
margin of facial and
lingual surface of a tooth.
(2) Diffuse patch on the
proximal surface may be
Orange stain
Chromogenic bacteria Serratia marcescens,
Flavobactraium lutescens. Exposure to
chromic acid fumes in factory workers
(Manuel et al., 2010). Both facial and lingual
surface of anterior teeth.
Green stain
Children are frequently affected due to
inadequate daily plaque removal,
chromogenic bacterial deposits or
decomposed hemoglobin.
(i)Fluorescent bacteria- Penicillium.
(iii) Associated with children with T. B. or
cervical lymph node.
3) Copper salts in mouth rinse (Manuel
et al., 2010).
4) Exposure to copper and nickel in the
environment in factory workers (Manuel
et al., 2010).
These are green or greenish
yellow stains of considerable
thickness. This type of stain is
considered as stained remnants
of enamel cuticles.
Facial surface of
maxillary anterior teeth.
Metallic stain
This type of stain is caused by metals and
metallic salts. Metals are penetrated into
tooth substances and produces permanent
decolonization or they bind with pellicle and
produce surface stain.
Source of metals:
(I) Introduction of metals into oral cavity.
(II) Metal containing dust inhalation by
(III)Oral administration of drugs.
Some metals that cause’s
Copper dust-Green stain
Iron dust-Brown stain
Magnesium-Black stain
Silver- Black stain Iodine- Black
stain Nickel- Green stain.
Metal penetrating into tooth
substance causes permanent
discoloration where as that bind
with pellicle causes surface stain
(Manuel et al., 2010).
Generalised appearance
on all the teeth.
Yellowish brown stains
Chlorhexidine has affinity for sulfate and
acidic groups such as those found in
pellicle, plaque constituents, carious lesion
and bacterial cell wall. So it is retained into
oral cavity and stained oral tissues
(Manuel et al., 2010).
Yellowish brown to brownish.
The stains are not permanent in
nature. It can be removed with
proper brushing with dentifrice.
(i)Cervical and
interproximal area of the
(ii) Plaque and other
(iii) Dorsum of tongue.
Yellow Essential oil and phenolic mouth rinse
(Manuel et al., 2010).
Golden brown stains Due to use of stannous fluoride (Mosby's
Dental Dictionary, 2008).
Violet to black Presence of potassium permanganate in
the mouth rinses (Manuel et al., 2010).
Use of betel leaves and nuts commonly
seen in adults and children in the Eastern
Hemisphere, where betel leaves and nuts
are used as stimulants (Mosby's Dental
Dictionary, 2008).
Thick, hard, dark brown or black
extrinsic stain left on the teeth
after chewing the leaves of the
betel palm (Mosby's Dental
Dictionary, 2008).
Facial, lingual and
occlusal surfaces of both
anterior and posterior
J. Acad. Indus. Res. Vol. 1(8) January 2013 437
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
Internalised discoloration: Internalised discoloration is the
incorporation of extrinsic stain within the tooth substance
following dental development. It occurs in enamel defects
and in the porous surface of exposed dentine. The routes
by which pigments may become internalised are:
1. Developmental defects.
2. Acquired defects.
a) Tooth wear and gingival recession.
b) Dental caries.
c) Restorative materials (Manuel et al., 2010).
Extrinsic tooth discoloration: The causes of extrinsic
staining can be divided into two categories;
a) Direct extrinsic tooth staining: Those compounds
which are incorporated into the pellicle and produce a
stain as a result of their basic color.
b) Indirect extrinsic tooth staining: Those which lead to
staining caused by chemical interaction at the tooth
Direct extrinsic tooth staining has a multi-factorial
aetiology with chromogens derived from dietary sources
or habitually placed in the mouth (Fig. 1). These organic
chromogens are taken up by the pellicle and the color
imparted is determined by the natural color of the
chromogen. Tobacco smoking and chewing are known to
cause staining, as are particular beverages such as tea
and coffee (Fig. 2 and 3). The color seen on the tooth is
thought to be derived from polyphenolic compounds
which provide the color in food (Pearson, 1976). Indirect
extrinsic tooth staining is associated with cationic
antiseptics and metal salts. The agent is without color or
a different color from the stain produced on the tooth
surface. Interest in the mechanisms of extrinsic tooth
staining was rekindled in 1971 with the observation by
Flotra et al. (1971) that tooth staining increases with the
use of chlorhexidine (Fig. 4).
Classification of extrinsic tooth staining
Extrinsic tooth discoloration has usually been classified
according to its origin, whether metallic or non-metallic
(Gorlin and Goldman, 1971).
Non-metallic stains: The non-metallic extrinsic stains are
adsorbed onto tooth surface deposits such as plaque or
the acquired pellicle. The possible aetiological agents
include dietary components, beverages, tobacco,
mouthrinses and other medicaments. Chromogenic
bacteria have been cited in children (Fig. 5 and 6).
Particular colors of staining are said to be associated
with certain mouths, for instance, green and orange in
children with poor oral hygiene and black/brown stains in
children with good oral hygiene and low caries
experience (Theilade et al., 1973). Conclusive evidence
for the chromogenic bacterial mechanism has not been
forthcoming. The most convincing evidence for the
extrinsic method of tooth staining comes from the
differing amount of stain found in a smokers and
non-smokers (Ness et al., 1977).
Fig. 1. Stains due to betel nut.
Fig. 2. Smoking stains.
Fig. 3. Tobacco stains.
Fig. 4. Chlorhexidine stains.
J. Acad. Indus. Res. Vol. 1(8) January 2013 438
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
Metallic stains: Extrinsic staining of teeth may be
associated with occupational exposure to metallic salts
and with a number of medicines containing metal salts
(Addy and Roberts 1981). The characteristic black
staining of teeth in people using iron supplements and
iron factory workers is well documented (Nordbo et al.,
1982). In a study conducted on school going students of
black stain scraping was taken from 5 students and it
was subjected to analysis for trace elements. Trace
elements analysis was done by (ICP) Inductively
Coupled Photo spectrometry. Out of 5 scrapings,
3 showed presence of ferrous ions of about 2.56%,
calcium ions 17.15% and magnesium ions 0.72%, while
the remaining 2 samples showed calcium 14.86%,
magnesium ions 0.82% and no presence of ferrous ions
(Tirth et al., 2009). Copper causes a green stain in
mouthrinses containing copper salts (Waerhag et al.,
1984) and in workers in contact with the metal in
industries (Dayan et al., 1983) (Table 1).
A number of other metals have associated colors such
as potassium permanganate producing a violet to black
color when used in mouth rinses; silver nitrate salt used
in dentistry causes a grey color, and stannous fluoride
causes a golden brown discoloration (Ellingsen et al.,
1982). It was previously thought that the mechanism of
stain production was related to the production of the
sulphide salt of the particular metal involved (Moran
et al., 1991). This is perhaps not surprising since the
extrinsic stain coincided with the color of the sulphide of
the metal concerned. However, those proposing the
hypothesis appeared not to consider the complexity of
the chemical process necessary to produce a metal
sulphide. As mentioned earlier the interest aroused by
the staining noted with use of chlorhexidine mouth rinse
has prompted renewed interest in the mechanism of
stain formation. For this reason most of the research into
stain formation has been carried out on chlorhexidine,
although there are other antiseptics which cause staining
to a lesser extent and the mechanism proposed could be
applicable to staining found with polyvalent metals. The
characteristic staining of the tongue and teeth noted by
Flotra and co-workers in 1971 is not peculiar to
chlorhexidine, it has been reported in other cationic
antiseptics, the essential oil/phenolic mouth rinse
‘Listerine’ and following prolonged use of delmopinol
mouthrinses (Claydon et al., 1996). There is great
individual variation in the degree of staining from person
to person, this makes explanation more difficult as it may
be caused by intrinsic factors, differences in extrinsic
factors or both. No longer accepted theories of stain
formation with chlorhexidine include breakdown of
chlorhexidine in the oral cavity to form parachloroaniline
(Gjermo et al., 1973) and also that chlorhexidine may
reduce bacterial activity such that partly metabolised
sugars were broken down and then degraded overtime to
produce brown-colored compounds (Davies et al., 1970).
Most recent debate has centered around three possible
Fig. 5. Orange stains due to chromogenic bacteria.
Fig. 6. Black stains due to chromogenic bacteria.
Non-enzymatic browning reactions: Berk (1976)
suggested that the protein and carbohydrate in the
acquired pellicle could undergo a series of condensation
and polymerisation reactions leading to
colordiscoloration of the acquired pellicle. Chlorhexidine
may accelerate formation of the acquired pellicle and
also catalyze steps in the Maillard reaction (Yates et al.,
1993). Observation of furfurals, intermediate products in
Maillard reactions, in brown-discolored pellicle has lent
support to the theory (Nordbo, 1977), but the evidence is
inconclusive (Eriksen et al., 1985). Moreover, these
authors did not consider at all the same staining
phenomenon observed with the numerous other
The formation of the pigmented sulphides of iron and tin:
this theory suggests that chlorhexidine denatures the
acquired pellicle to expose sulphur radicals. The
exposed radicals would then be able to react with the
metal ions to form the metal sulphide. Warner and
coworkers have shown increased levels of iron in
chlorhexidine treated individuals compared with water
controls, no evidence was shown for tin (Warner et al.,
1993). They then went on to conclude that the
chromophore was not a sulphide, but a sulphur
containing organic compound and metal ion complex and
that chlorhexidine promoted the deposition of sulphate
proteins. However, somewhat anomalously although the
amount of stain and iron levels were increased.
J. Acad. Indus. Res. Vol. 1(8) January 2013 439
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
Management of stains
Proper diet and habits: Extrinsic staining caused by
foods, beverages, or habits (eg, smoking, chewing
tobacco, coffee and tea) is treated with a thorough dental
prophylaxis and cessation of dietary or other contributory
habits to prevent further staining (Azer et al., 2011).
Tooth brushing: Effective tooth brushing twice a day with
a dentifrice helps to prevent extrinsic staining. Most
dentifrices contain an abrasive, a detergent, and an
anti-tartar agent. In addition, some dentifrices now
contain tooth-whitening agents.
Over-the-counter products: Three types of whitening
toothpastes are manufactured. The first type, based on
use of an abrasive to remove extrinsic stains, has been
available for many years (Haywood and Robinson, 1997;
Council on Scientific Affairs, 1997). All toothpastes,
however, contain some abrasives and are capable of
potentially removing stains whether they are labeled
"whitening" or not. Toothpastes with a high content of
abrasives should not be recommended for daily use.
Secondly, the newer whitening toothpastes contain a
bleaching agent, such as peroxide, but the Council on
Scientific Affairs of the American Dental Association
(ADA) does not recommend them for long term use
(Hosoya and Johnston, 1989). Lastly, cosmetic
toothpastes, containing titanium dioxide, cover extrinsic
stains like paint covers a wall and do not change the
internal tooth color (Haywood and Robinson, 1997).
Professional tooth cleaning: Some extrinsic stains may
be removed with ultrasonic cleaning, rotary polishing with
an abrasive prophylactic paste, or air-jet polishing with
an abrasive powder (Weaks et al., 1984). However,
these modalities can lead to enamel removal; therefore,
their repeated use is undesirable (Croll, 1977).
Ultrasonic and sonic scaling: Ultrasonic and sonic
scalers are referred to as power-driven scalers. The
small, quick vibrations in combination with a water flow
give us a whole new level of effectiveness in removal of
deposits on the tooth surface. The benefits of ultrasonic
scaling include increased efficiency of calculus removal
and less need for hand scaling. High vibrational energy
generated in the oscillation generator is conducted to the
scaler tip, causing vibrations with frequencies in the
range of 25,000–42,000 Hz. The amplitude ranges from
10 to 100 μm. Micro-vibration crushes and removes
calculus under cooling water. Ultrasonic and sonic
scalers vary in their efficiency in removing calculus from
the tooth surfaces. Sonic scalers are air-turbine units that
operate at low frequencies ranging between 3000 and
8000 cycles per sec (Cps). Tip movement and the effect
of root surfaces can vary significantly depending on the
shape of the tip and type of the sonic scaler. In general,
tip movement is orbital. Sonic scalers provide a simple
and inexpensive mechanism.
Sonic scalers have a high intensity noise level because
of the release of air pressure needed for movement of
the tip of the sonic hand-piece (American Academy of
Pediatric Dentistry, 2000).
Selective polishing: Selective polishing involves polishing
only the areas of stains. In this procedure, the dental
auxiliary can select specific teeth to be polished using a
prophylactic angle and rubber cup with a fine paste, and
can brush the remaining teeth with a toothbrush to
remove bacterial biofilm on tooth surfaces. According to
the American Academy of Periodontology (2000) and
other sources (Mellberg, 1979), polishing for
approximately 30 sec with a prophylactic paste
containing pumice can remove between 0.6 µm and 4
µm of the outer enamel. The outer surface of the enamel
contains a natural component of fluoride, with the highest
amount of fluoride concentrated on its surface. When
using a prophylactic angle with a prophylactic cup on this
enamel-rich surface, the dental assistant may not only
remove the fluoride layer, but also introduce a rough
surface and/or scratches on the tooth surface, which can
contribute to the further harboring of bacteria on these
Benefits: Minimises irreversible loss of enamel. Prevents
damage to the restorative surfaces requires less time.
More time can be spent for patient education.
Prophylactic paste: Prophylactic pastes contain abrasive,
water, humectants, binder, sweetener, flavoring and
coloring agents. Prophylaxis polishing agents are
available in two basic forms: dry powders, also referred
to as flours that must be mixed with a liquid (water,
fluoride, or mouth rinse) and commercially prepared
polishing pastes that are available in bulk or individual
unit doses. Dry powders or flours are not graded
according to grit, rather they are graded in order of
increasing fineness: F, FF, and FFF. Powders or flours
with no wetting agent represent the greatest quantity of
abrasives that can be applied per unit of time and they
create excessive heat. Therefore, the use of dry
abrasives or powder on a dry polishing cup is
contraindicated due to the potential for thermal injury to
natural teeth. The grit of commercially prepared polishing
pastes is graded from fine to coarse, based on a
standard sieve through which the particles pass (Wilkins,
2009). The types of abrasive particles used in polishing
pastes vary among the commercial varieties and from
one grit size to another, yet there is no industry standard
to define what these terms mean or what size the
abrasive particle must be. The types of abrasive particles
used in commercial prophylaxis polishing pastes include
flour of pumice, aluminum oxide, silicon carbide,
aluminum silicate, silicon dioxide, carbide compounds,
garnet, feldspar, zirconium silicate, zirconium oxide,
boron, and calcium carbonate (Wilkins, 2009).
J. Acad. Indus. Res. Vol. 1(8) January 2013 440
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
Others include emery, perlite, and silica. Commercially
prepared prophylaxis polishing pastes combine
abrasives with a binder, humectants, coloring agent,
preservatives, and flavoring agents. Manufacturers
generally do not disclose the amount of ingredients in
their polishing pastes because the information is
proprietary. However, it is general knowledge that
pumice and glycerin are the most commonly used
ingredients in commercially prepared polishing pastes.
Some commercially prepared polishing pastes contain
fluoride. Fluoride in prophylaxis polishing pastes is not a
replacement for a fluoride treatment (Wilkins, 2009).
Unfortunately, many dental hygienists use whatever type
of polishing paste is available on every patient,
regardless of the grit size. Even worse is the fact that
some dental hygienists subscribe to the "coarse grit
theory." The premise for this ill-advised idea is that the
use of the coarsest polishing paste available will remove
the heaviest amounts of stain as well as the lightest
amounts, thus saving time. Providers who polish in this
fashion ignore the professionally recommended method
of using the polishing grits in a progression of coarse,
medium, and fine applications, which is supported by
well-established science and is applied not only in health
care but in mechanical polishing procedures in a variety
of industries. In an ideal setting the progression from
coarse to fine paste is best. In clinical practice, if a dental
hygienist is using medium grit paste it is best to follow
with fine grit. Coarse grit polishing pastes can produce
hypersensitivity, rough tooth surfaces, pastes are only
needed in situations of heavy stain.
Proof of the widespread use of the "coarse pumice
theory" lies in the published sales of coarse grit as the
leading selling brand of polishing paste; 80% of polishing
paste sales are in coarse grit and 10% are in medium
grit. Coarse grit polishing pastes may remove and
accelerate staining and the retention of dental plaque
and calculus.
Port polisher: Port polisher consisting of orangewood
points is helpful in situations when aerosol should not be
produced, in abraded cervical areas, or when electricity
is not available. However slowness of the procedure and
amount of hand strength for instrumentation are its
drawback. Although highly abrasive in nature, polishing
or finishing strips present an option for
inter-proximal areas or line angles but should be
cautiously used to avoid cutting of soft tissues.
New options and available evidence
For many years, the most notable advancement in
traditional polishing was the introduction of prophy
pastes in unit-dose cups. Since then, new formulations of
commercial polishing pastes have been added to the
polishing armamentarium. For more than a decade,
commercial polishing pastes that contain perlite as an
abrasive ingredient have been available.
Prophy pastes containing perlite make claims that the
abrasive particles break down and become less abrasive
under pressure. Scientific evidence supports the fact that
the abrasive agents in these products do break down
under load (pressure). However, scientific evidence
supports the fact that most abrasives in polishing pastes
break down under pressure. Amorphous calcium
phosphate (ACP) products that include a polishing paste
claim to remineralize enamel subsurface carious lesions.
These products are missing a body of research in vivo.
The current research exists only in vitro. Three scientific
questions need to be addressed: Is it possible to burnish
an ingredient such as ACP into enamel with a polishing
product that is abrasive and meant to remove stain?
What are the true benefits of ACP or similar products
such as casein phosphopeptide-amorphous calcium
phosphate (CPP-ACP) over the known remineralization
properties of fluoride? Why has fluoride been added to
some of these ACP and CPP-ACP products? Polishing
paste with calcium sodium phosphosilicate is a new
development. Calcium sodium phosphosilicate is a
bioactive glass that releases calcium and phosphorus
ions rapidly and is currently being incorporated into other
dental products. Scientific clinical research is not
available to support the claim that this product
immediately relieves dentinal hypersensitivity. Some in
vitro studies of ACP, CPP-ACP, and calcium sodium
phosphosilicate-containing products do indicate clinical
promise; however, the lack of in vivo research to date is
the matter of concern. It will be a leap forward if the
additives to polishing pastes can remineralize carious
lesions and immediately relieve hypersensitivity on a
long-term basis.
There is no doubt that polishing pastes are going through
a period of renewal as manufacturers are looking for
ways to add remarkably active ingredients to such an
inexpensive and easy delivery system. It is challenging,
however, for manufacturers to add these novel
ingredients while retaining the expected performance of
polishing pastes. Hopefully, the future will bring about
this much-needed research and the introduction of new
products (Litkowski et al., 1997).
Air jet polishing: Air polishing was first introduced to the
dental community in the late 1970s as a mechanism to
quickly and easily remove extrinsic stain and soft
deposits. It also helps minimize hand, wrist, neck and
eye fatigue like a cavitron tip, by helping to remove stain
quicker than scaling and polishing the conventional way.
Air polishing uses a water soluble sodium bicarbonate
mixture to help in the removal of stain and plaque during
a routine hygiene appointment. Air polishing is great to
help in the removal of stain due to smoking, coffee, tea,
chlorhexidene and other extrinsic factors. Aluminum
trihydroxide is an alternative solution to the sodium
bicarbonate for patients, they are sodium restricted and
have heavily stained enamel. Avoid use on dentin,
cementum and restorative resins.
J. Acad. Indus. Res. Vol. 1(8) January 2013 441
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
Use of the air polisher for stain removal involves three
steps: patient selection and preparation, clinician
preparation, and the actual clinical technique.
Air polishing should follow a careful review of the
patient's medical and dental history, and a thorough
examination of the oral hard and soft tissues. Indications
and contraindications, effects on hard tissues,
restorations, safety, and alternative uses should be
reviewed prior to treatment planning the use of the air
polisher. Preparation of the patient should include an
explanation of the procedure, removal of contact lenses,
an anti-microbial rinse, application of a lubricant to the
lips, placement of safety glasses or a drape over the
nose and eyes, and placement of a plastic or disposable
drape over the patient's clothing. Operators should use
universal precautions, including protective apparel, a
face shield or safety glasses with side shields, gloves,
and a well-fitting mask with high-filtration capabilities.
The actual air polishing technique includes proper patient
and operator positioning for adequate access and direct
vision, use of high-speed suction if an assistant is
available, or use of the saliva ejector and
aerosol-reduction device when working alone. The
suction orifice of the saliva ejector should be as close as
possible to the tip. It also may enhance patient comfort if
moistened 2x2 gauze square is placed over the tongue
or lip in the area being polished. Rapid, sweeping strokes
are recommended, with the tip directed at a 60 angle to
the tooth for anterior teeth, 80 for posterior teeth, and a
90 for occlusals. Cupping the lip with the forefinger and
thumb allow the water to pool in the vestibule for easier
evacuation and minimal aerosol dispersion. Polishing two
to three teeth at a time by fully depressing the foot pedal,
then rinsing the teeth and tongue by pressing the foot
pedal half way increases efficiency and minimizes the
saline taste. A systematic approach to polishing all teeth
will increase efficiency. Polishing for five seconds or less
per tooth is usually adequate to remove most of the
Tooth discoloration is a frequent dental findings
associated with clinical and esthetic problems. It differs in
etiology, appearance, composition, location and severity.
Knowledge of the etiology of tooth staining is of
importance to dental surgeons in order to enable a
correct diagnosis to be made when examining a
discolored dentition and allows the dental practitioner to
explain to the patient the exact nature of the condition. In
some instances, the mechanism of staining may have an
effect on the outcome of treatment and influence the
treatment options the dentist will be able to offer to
patients. Dental auxiliaries must use good judgment
when considering coronal polishing and practice
preventive procedures as the standard of care, which
means that treatment must be individualized.
Patients may not be aware of the effects of rubber-cup
polishing on the enamel, so it is the job of the dental
assistant to educate patients on the philosophy of
polishing based solely on need.
1. Addy, M. and Roberts, W.R. 1981. The use of
polymethylmethacrylate to compare the adsoprtion of
staining reactions of some cationic antiseptics. J.
Periodontol. 52: 380-385.
2. American Academy of Pediatric Dentistry. 2000. The role
of prophylaxis in pediatric dentistry. Pediatr. Dent. 22(7):
3. American Dental Hygienists' Association. 1999. Oral
Health Information: Tooth Whitening Systems. Retrieved
4. Aryan, H. 2005. Tooth whitening industry opens wide
with myriad procedures and products. San Diego Union-
5. Azer, S.S., Hague, A.L. and Johnston, W.M. 2011. Effect
of bleaching on tooth color discoloration from food
colorant in vitro. J. Dent. 39(3): e52-56.
6. Berk, Z. 1976. Non-enzymatic browning. In: Braveman’s
introduction to the biochemistry of foods. Amsterdam:
Elsevier. pp.149-167.
7. Claydon, N., Hunter, L. and Moran, J. 1996. A 6-month
home usage trail of 0.1% and 0.2% delmopinol
mouthwashes. Effects on plaque, gingivitis,
supragingival calculus and tooth staining. J. Clin.
Periodontol. 23: 220-228.
8. Council on Scientific Affairs. 1997. ADA position
statement on the safety of hydrogen peroxide-containing
dental products intended for home use. Adopted by the
American Dental Association Board of Trustees, April
14, Chicago, IL 60611.
9. Croll, T.P. 1997. Enamel micro-abrasion: Observations
after 10 years. J. Am. Dent. Assoc. 128 (Suppl.): 45S-
10. Davies, R.M., Jensen, S.B., Schiott, C.R. and Loe, H.
1970. The effect of topical application of chlorhexidine
on the bacterial colonization of the teeth and gingiva. J.
Periodont. Res. 5: 96-101.
11. Dayan, D., Heifferman, A., Gorski, M. and Begleiter, A.
1983. Tooth color discoloration- extrinsic and intrinsic
factors. Quintessence Int. 2: 195-199.
12. Ellingsen, J.E., Eriksen, H.M. and Rolla, G. 1982.
Extrinsic dental stain caused by stannous fluoride.
Scand. J. Dent. Res. 90: 9-13.
13. Eriksen, H.M., Nordbo, H., Kantanen, H. and Ellingsen,
J.M. 1985. Chemical plaque control and extrinsic tooth
discoloration. A review of possible mechanisms. J. Clin.
Periodontol. 12: 345-350.
14. Flotra, A. 1971. Side effects of chlorhexidine mouth
washes. Scand. J. Dent. Res.79: 119-125.
15. Gjermo, P., Rolla, G. and Arskaug, L. 1973. Effect of
dental plaque formation and some in vitro properties of
12 biguanides. J. Periodontal. Res. 12: 81-88.
16. Gorlin, R.J. and Goldman, H.M. 1971. Environmental
pathology of the teeth. In: Thoma’s oral pathology. 6th
ed. 1: 184-192.
J. Acad. Indus. Res. Vol. 1(8) January 2013 442
©Youth Education and Research Trust (YERT) Sruthy Prathap et al., 2013
17. Haywood, V.B. and Robinson, F.G. 1997. Vital tooth
bleaching with night guard vital bleaching. In Golub-
Evans J(ed). Curr. Opin. Cosmet. Dent. 4: 45-52.
18. Hosoya, Y. and Johnston, J.W. 1989. Evaluation of
various cleaning and polishing methods on primary
enamel. J. Pedod. Spring. 13(3): 253-269.
19. Litkowski, L.J., Hack, G.D, Sheaffer, H.B. and
Greenspan, D.C. 1997. Occlusion of dentinal tubules by
45S5 Bioglass®. In: Bioceramics 10, Proceedings of the
10th International Symposium on Ceramics in Medicine.
Sedel L, Rey C, eds. Oxford, England: Aldent Press,
20. Madan, C., Bains, R. and Bains, V.K. 2009. Tooth
polishing: Relevance in present day periodontal practice.
J. Ind. Soc. Periodontol. 13(1): 58-59.
21. Manuel, S.T., Abhishek, P. and Kundabala, S. 2010.
Etiology of tooth discoloration-a review. MNig. Dent. J.
18(2): 56-63.
22. Mellberg, J.R. 1979. The relative abrasivity of dental
prophylactic pastes and abrasives on enamel and
dentin. Clin. Prev. Dent. 1(1): 13-18.
23. Moran, J., Addy, M., Pal, D. and Newcombe, R. 1991.
Comparison of phenolic 0.2% chlorhexidine products on
the development of plaque and gingivitis. Clin. Prev.
Dent. 13: 31-35.
24. Mosby's Dental Dictionary. 2008. 2nd ed. © 2008
Elsevier, Inc. All rights reserved. 79(2): 219-221.
25. Ness, L., Rosekrans, D.L. and Welford, J.F. 1977. An
epidemiologic study of factors affecting extrinsic staining
of teeth in an English population. Community Dent. Oral
Epidemiol. 5: 55-60.
26. Nordbo, H. 1977. Color discoloration of dental pellicle by
tannic acid. Acta. Odontol. Scand. 35: 305-310.
27. Nordbo, H., Eriksen, H.M., Rolla, G., Attramadal, A. and
Solheim, H. 1982. Iron staining of the acquired enamel
pellicle after exposure to tannic acid or chlorhexidine.
Scand. J. Dent. Res. 90: 117-123.
28. Pearson, D. 1976. The chemical analysis of foods. 7th
ed. London: Churchill Livingstone, pp.1-450.
29. Theilade, J., Slots, J. and Fejerskov, S. 1973. The
ultrasound of black stain on human primary teeth.
Scand. J. Dent. Res. 81: 528-532.
30. Tirth, A., Srivastava, B.K., Nagarajappa, R., Tangade, P.
and Ravishankar, T.L. 2009. An investigation into black
tooth stain among school children in Chakkar Ka Milak of
Moradabad City. Ind. J. Oral Health Comm. Dent. 3(2):
31. Waerhag, M., Gjermo, P., Rolla, G. and Johansen, J.R.
1984. Comparison of the effect of chlorhexidine and
CuSO4 on plaque formation and development of
gingivitis. J. Clin. Periodontol. 11: 176-180.
32. Warner, R.R., Myers, M.C., Burns, J. and Mitra, S. 1993.
Analytical electron microscopy of chlorhexidine induced
stain in humans: Direct evidence for metal induced stain.
J. Periodont. Res. 28: 255-265.
33. Watts, A. and Addy, M. 2001. Tooth color discoloration
and staining: A review of literature. Br. Dent. J. 190(6):
34. Weaks, L.M., Lescher, N.B., Barnes, C.M. and Holroyd,
S.V. 1984. Clinical evaluation of the Prophy-Jet as an
instrument for routine removal of tooth stain and plaque.
J. Periodontol. 55(8): 486-488.
35. Wilkins, E.M. 2009. Clinical practice of the dental
hygienist. 10th ed. Philadelphia Lippincott Williams and
Wilkins. pp.727-740.
36. Yates, R., Jenkins, S., Newcombe, R.G., Wade, W.G.,
Moran, J. and Addy, M.A. 1993. 6 month home usage
trail of 1%chlorhexidine toothpaste. Effects on plaque,
gingivitis, calculus and tooth staining. J. Clin.
Periodontol. 20: 130-138.
... The effect of conventional smoking on the color change of composite resins has been reported in several studies [19][20][21][22]. Additionally, conventional smoking affects the translucency of dental enamel and resin composites [23,24]. ...
... The translucency of teeth differs from tooth to tooth and from area to area at the same tooth, for example, the translucency of the central upper incisor is 15 TP at the incisal area, and it decreases to 5 at the cervical area [19]. The mean TP of 1 mm thickness human tooth was 16.4 and another study suggests that there are some differences and variations in the TP values of sectioned human dentin with thicknesses ranging from 0.5 to 2.0 mm [20]. ...
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This in vitro study compared the effects of conventional and electronic cigarettes on the aesthetics (color stability and translucency) of two types of composite resins: micro and nano-hybrid. Methods: A total of 120 specimens from two different composite materials Filtek Z250 XT (Nano-hybrid, 3M) and Filtek Z250 (Micro-hybrid, 3M) were divided into four groups (n = 30); shade A2 was used. The samples were exposed to conventional and electronic cigarette smoke via a custom made chamber device. The color values and measurements were recorded using a spec-trophotometer before and after the exposure. The color and translucency were evaluated using the three-dimensional CIE Lab. Results: There was a significant change in the color (ΔE) and the trans-lucency parameter (TP) in all of the specimens exposed to electronic cigarettes and conventional cigarettes. The results showed that the highest ΔE mean is for the nano-hybrid composite exposed to conventional cigarettes with 1.74 ΔE while the same material is 0.64 under the electronic cigarettes and the difference is significant with (p < 0.05). The micro-hybrid composite data showed less changes in color under both exposures with 0.85 ΔE mean under the conventional cigarette smoke and 0.48 under the electronic cigarette smoke with (p < 0.004). Conclusions: The conventional cigarette smoke has more effect on the color stability of the composite resins than electronic cigarettes. From a clinical point of view, the effect of smoke exposure on the tested specimens' color, for the time duration to which the specimens were exposed, were moderate (ΔE < 2). The micro-hybrid composites showed better color stability as compared to the nano-hybrid composites.
... Additionally, enamel defects, dental caries, or restorative materials may facilitate the incorporation of such compounds within the tooth structure 5 . However, it should be noted that the extrinsic staining deposited on the enamel is not resistant to removal with either regular toothbrushing or professional prophylaxis 4,6 . ...
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Aim: To determine if the artificial staining with black tea (BT) influences the enamel microhardness before in-office bleaching and if BT staining is necessary to evaluate the efficacy of bleaching with 35% hydrogen peroxide Methods: Enamel/dentin blocks were randomized into groups according to the staining protocol (n=5/group): (CO) control – maintained in artificial saliva solution (AS); (BT4) immersed in black tea solution for 4 h; (BT24) immersed in black tea solution for 24 h. After the staining protocols, all specimens were kept in AS for one week, followed by bleaching (three sessions of HP application for 40 min). Knoop surface microhardness (kgF/mm2) was determined at baseline (T0), after staining (T1), after 7 days of storage in AS (T2), and after bleaching (T3). The color (ΔE00) and coordinate changes (ΔL, Δa, Δb) were measured using a digital spectrophotometer at T0 and T3. Data were submitted to one-way (ΔE00, ΔL, Δa, Δb) or two-way ANOVA repeated measures (kgF/mm2) and Tukey’s test (a=5%). Results: The staining protocols (BT4 and BT24) promoted significantly lower microhardness (T1 and T2, p<0.05) than CO, whereas CO was the only group to maintain microhardness values over time. Bleaching promoted perceptible ΔE00 without a significant difference among the groups regardless of the staining protocol (p=0.122). CO and BT4 showed no differences in terms of ΔL and Δa (p>0.05), but BT4 displayed a higher Δb than CO. Conclusion: The artificial staining with BT negatively affected the enamel surface microhardness and was not essential to evaluate the efficacy of 35% hydrogen peroxide bleaching.
... 47 Specifically, CHX mouthwash causes brown discoloration on the surface of the teeth which may be removed by a dental expert after scaling and polishing. 48 However, CHX mouthwash causes no or minimal discoloration after 1 or 2 weeks of treatment. 49 Other side effects of CHX include taste disruption and mouth lining pain, both of which are temporary and normally reversible after mouthwash use is stopped. ...
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The efficacy of mouthwash for reducing the viral load in patients with the novel coronavirus disease 2019 (COVID-19) remains unclear. This systematic review and meta-analysis comprehensively examined the effects of chlorhexidine (CHX) and povidone-iodine (PVP-I) on the viral load in patients with COVID-19. We performed methodological analysis, systematic review, and meta-analysis of included studies using the Comprehensive Meta-analysis Software. PubMed, EMBASE, Cochrane Library, and ProQuest were searched from December 1, 2019, to December 2, 2021. In total, we included 10 studies of 1,339 patients with COVID-19. Compared with the control group, both CHX and PVP-I significantly reduced the number of negative reverse-transcription polymerase chain reaction (RT-PCR) results ( p <0.001) among COVID-19 patients. The CHX and PVP-I were effective on reducing the number of negative RT-PCR results in COVID-19 patients. Additional studies using adequate randomization methods and larger samples are warned.
... There are different variations and types of stains depending on the aetiology, appearance, composition, location, severity and degree of adherence to the tooth. [8] The classification of tooth discolouration is mainly divided into intrinsic, extrinsic, and internalized. ...
... [1][2][3][4] Por lo general el consumo de este mineral se prescribe para las anemias ferropénicas que son muy frecuentes en nuestro país, pero no solo produce alteraciones dentarias, sino que a la vez también pigmentaciones en la mucosa y dérmicas. 10,11,13,15,16 Los compuestos de este mineral actúan sobre la superficie de los dientes, creando alteraciones negruzcas combinadas con bacterias de tipo cromógena las que se ponen en contacto con la secreción de glándulas salivales dando como formación la mancha negra. [5][6][7][8][9] En el Ecuador las patologías de tipo anémico son muy frecuentes, estrechamente relacionados con otros trastornos agravantes como la desnutrición, pacientes en estado de gestación, en la infancia y adolescencia. ...
Introducción: el hierro es un elemento que se prescribe en las afecciones generalmente de tipo anémico en los niños. Cuando este elemento se consume en dosis elevadas y en tiempos prolongados por lo general causa una afección denominada la mancha negra o tinción cromógena, que afecta a las piezas dentarias del niño. Metodología: se realizó un análisis descriptivo. La población fue de 40 niños, los cuales asistieron al Centro Infantil Santa Dorotea en el periodo 2017. Resultados: del estudio realizado, se tiene que el 80% de los casos presenta una pigmentación de mancha negra de tipo 1 (leve), el resto de los casos presentan una mancha negra de tipo 2 (moderada) no se registran datos severos de tinción. Se realizó una prueba de Chi-Cuadrado, para corroborar si existe una relación de dependencia entre tipo de mancha negra con el tiempo de ingesta. Discusión: en la presente muestra de estudio la incorrecta dosis de hierro tiene un efecto negativo sobre la estructura de las piezas dentarias provocando la mancha negra. Conclusión: mientras mayor sea el tiempo de ingesta aumentan los casos de pigmentación de mancha negra, no obstante, el tiempo de ingesta no influye para variar el tipo de mancha negra.
... Tooth surface discoloration considered to be the main reason to seek dental care as it can affect esthetic appearance of the patient's smile, it can also cause negative psychological effects to the patient. In order to make the correct treatment plan, a dental clinician must understand the etiology of tooth discoloration which can be divided to two main categories either internal discoloration or external discoloration (1)(2)(3)(4) . ...
... In mild to moderate cases, it is selected as a primary treatment option while in severe cases its selected as a secondary option to veneers. 2 In the esthetic era, the bleaching procedure becomes an essential treatment option rather than a sophisticated option. The outcome of bleaching must be free from complication. ...
Aim and objective: The aim of this study was to evaluate the efficacy of novel antioxidant oregano against conventional antioxidants sodium ascorbate and green tea through comparison of the baseline weight percentage (wt%) of minerals prior to bleaching with values after bleaching protocols and antioxidant application by employing energy-dispersive X-ray spectroscopy analysis (EDAX). Materials and methods: Thirty noncarious, freshly extracted human permanent maxillary incisors without any visible defects were selected as samples. They were divided into three groups (n = 10) based on the antioxidant treatment received as follows: group I-10% sodium ascorbate solution, group II-10% green tea solution, and group III-5% oregano solution. 35% hydrogen peroxide was employed for bleaching. The wt% of teeth was calculated at three time intervals. The initial wt% was calculated prior to the bleaching procedure. The second one was calculated after subjecting to bleaching protocols, and final one was calculated after antioxidant treatment using EDAX. Results: There was a statistically significant decrease in the calcium/phosphorus ratio for the bleached samples in comparison with the sound enamel. There was a comparable and significant increase in the calcium/phosphorus ratio values after application of the antioxidant with insignificant difference among the antioxidants evaluated in the study. Conclusion: Treatment with antioxidants helped in the reversal of mineral loss, which occurred due to the bleaching procedure while the efficacy of 10% oregano on reversal of the calcium and phosphorus ratio was found to comparable to that of 10% sodium ascorbate and green tea. Clinical significance: Application of antioxidants after bleaching reduced the time delay in performing the adhesive procedures without compromising their clinical efficacy.
... High concentrations of bleaching agents are applied to the teeth after the soft tissues are well eliminated. Here the dentist has full control (Ozduman & Celik, 2017;Prathap et al., 2013). The treatment can be finished when the desired color is achieved. ...
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Objective This trial evaluated the influence of polishing on enamel color change after in-office bleaching treatment. In addition, it evaluated the influence of polishing on tooth morphology and sensitivity. Materials and methods Fifty volunteers were randomized into two groups (n = 25): In-office bleaching with 35% hydrogen peroxide gel for 45 min without polishing (GSEM) or with polishing (GP). The color analysis was performed four times, at baseline, and immediately after the 1st, 2nd, and 3rd session of bleaching with Easyshade spectrophotometer (Vita-Zahnfabrik), using the CIELAB (ΔE) and CIEDE2000 (ΔE00) formulas, and whiteness index (ΔWID). A qualitative analysis of enamel morphology was performed using replicas obtained with epoxy resin observed in a scanning electron microscope (277× and 554× magnification). The tooth sensitivity was assessed daily using the visual analog scale (α = 0.05). Results There was no statistically significant difference (p > 0.05) in tooth color change when comparing ΔE, ΔE00, and ΔWID between groups. The enamel surface showed greater areas of irregularities and depressions in the GP group than in the GSEM group. There was no difference in tooth sensitivity (p > 0.05) between groups. Conclusions Polishing after in-office tooth whitening does not change the tooth color and sensitivity and promotes greater changes in enamel surface morphology. Clinical relevance: Polishing immediately after tooth whitening causes greater changes in enamel surface morphology.
Our prospective study analyzed clinical, radiographic, and histological characteristics of 102 intrinsically stained teeth. Sixty-nine dogs ranging from one to fifteen years of age were included in this study. Little more than half of the intrinsically stained teeth had no evidence of coronal injury (53.9%, 55/102). We found that most intrinsically stained teeth were histologically nonvital (87.6%, 85/97) and approximately 2/3 of these (57.7%, 56/97) had no histological endodontic or periodontal inflammation at the time of evaluation. Radiographic evidence of endodontic disease was present in 57% (58/102) of the intrinsically stained teeth. Radiographic evidence of periodontal disease was present in 48% (49/102) of intrinsically stained teeth and 28% (29/102) had radiographic evidence of tooth resorption. 18.6% (19/102) of intrinsically stained teeth were radiographically normal. Evidence of pulp necrosis was common in these intrinsically stained teeth, while only occasional teeth (12.4%, 12/97) had histologically confirmed pulpitis. All teeth with radiographic evidence of periapical lucency had pulp necrosis. Based on our histological findings, the majority of intrinsically stained teeth 87.6% are truly nonvital.
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Background Tooth discoloration is a frequent dental finding associated with clinical and esthetic problems. It differs in etiology, appearance, composition, location and severity. During routine school dental camps we found that there is black discoloration of tooth in children in a particular area of Moradabad city. Objective To assess the prevalence and to investigate the reasons for the black stains among school children of Moradabad city. Methods Three schools present in the municipal ward were selected for the study. All the children studying in the above schools were subjected to Type III investigation to identify the black stains. Out of 780 children 156 students showed black stains. Among them a sample of black stain scraping was taken from 5 students and it was subjected to analysis for trace elements. Trace elements analysis was done by (ICP) Inductively Coupled Photo spectrometry. Results Out of 5 scrapings 3 showed presence of ferrous ions of about 2.56%, calcium ions 17.15% and magnesium ions 0.72%, while the remaining 2 samples showed calcium 14.86%, magnesium ions 0.82% and no presence of ferrous ions. Conclusion Black extrinsic tooth stains were shown to be a form of dental plaque. The stains examined contained a black insoluble ferric compound.
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Time has seen the emergence of more efficient and effective devices like jet abrasives. However, the role of rubber cups with prophy angles cannot be overlooked as they are still being widely used and provide an economical alternative. Owing to several shortcomings associated with the air polishing device using sodium bicarbonate (NaHCO(3)), trends are shifting towards the usage of low abrasive powders. Recent demonstration of Glycine Powder Air Polishing (GPAP) in removing subgingival biofilm results in less gingival erosion than hand instrumentation or NaHCO(3) air-polishing. Despite the emergence of latest advances in polishing, data suggesting selective polishing of teeth is compelling.
Abstract – Extrinsic discoloration of teeth following a large consumption of tannin-containing beverages or a prolonged use of chlorhexidine mouthrinses is a well known observation. Tannins as well as chlorhexidine are denaturing agents. Based on preliminary studies revealing the presence of iron in chlorhexidine discolored pellicle material, the ability of iron to stain the integument after pretreatmentwith the two denaturants was studied in a human model. The denaturing effect of an acidic environment was also included. Enamel slabs fixedto acrylie appliances were carried in the oral cavity and alternately exposed to the test solutions in different sequences in vitro. Pretreatment with chlorhexidine or tannic acid led to marked discolorations upon iron application during 5-d tests, whereas the compounds individually had no such effect. A large content of the metal was found in the stained material. Stannous fluoride appeared to reduce the formation of the pigments, and strong oxidation completely bleached the established color. Possible mechanisms underlying the phenomena observed are discussed.
The purpose of this study was to evaluate the effect of bleaching on tooth discolouration from neutral food colourant media (NFCM). Freshly extracted human molar teeth (n = 32) were divided into four groups (n = 8): non-bleached treatment-NBT, non-bleached control-NBC, bleached treatment-BT and bleached control-BC. Bleached teeth specimens were subjected to 20% carbamide peroxide bleaching agent for 10h. Colour measurements (pre-test) were done using a non-contact spectroradiometer. The teeth specimens were immersed in a neutral buffer solution. NBT and BT groups had 0.025% red food colour (Red 40) added to the buffer solution. The immersed specimens were incubated for 4h at 37°C. Colour was again measured after immersion/incubation (post-test) and after subsequent polishing using plain-pumice slurry (post-polish). Differences in CIE a* (redness parameter) were analysed by repeated measures ANOVA with Bonferroni-corrected t-tests for the pairwise comparisons of interest. Tooth discolouration was measured as total stain (mean difference in a* between post-test minus pre-test), extrinsic stain (mean difference in a* post-polish minus post-test) and intrinsic stain (mean difference in a* post-polish minus pre-test) A statistically significant difference in the mean Δa* was observed (P = 0.009) between staining treatment for bleached and non-bleached teeth. Also, a statistically significant difference (P < 0.001) was noted between control and treatment groups of bleached teeth that were subjected to staining. Bleaching resulted in total and extrinsic tooth discolouration by the NFCM. It might be beneficial to avoid highly pigmented foods immediately following bleaching in order to optimize the effects of tooth whitening.
A survey is described in which extrinsic staining of teeth was assessed by practising dentists during routine clinical examinations. Habits information was also supplied by patients. The results show that extrinsic staining is markedly influenced by smoking habits and age, and that males tend to have more staining than females. The effect of tea and coffee consumption was not pronounced. No effect attributable to the use of a stannous fluoride toothpaste was observed.
The ability of tannic acid to discolor pellicle was studied in vitro and in vivo. Freshly extracted teeth were submerget in solutions of tannic acid, and in the clinical study individuals rinsed three times daily with 0.1% or 0.2% tannic acid. It was fount that 0.2% tannic acid caused brownish discolorations within 10-12 days both in vitro and in vivo. Discolored pellicle material collected from the in vivo test group was shown to contain furaldehyde after hydrolysis. The origin of the furaldehyde is not ascertained, but could be due to the presence of dietary deposits, transformation of pellicle pentoses, or from reactions between reducing sugars and amino compounds.
Chlorhexidine and phenolic mouthrinses have attracted considerable interest as adjuncts to oral hygiene. The aim of this study was to compare two well known proprietary mouthrinse products for their effects on plaque regrowth, the development of gingivitis and the formation of toothstaining. The study was a single-blind, randomized, placebo-controlled, triple cross-over experimental, gingivitis design. A group of 15 volunteers with a very high standard of oral hygiene and gingival health used each rinse for 19 days in the absence of normal toothcleaning. Each period was separated by a 21 day washout. Plaque scores were significantly different between the rinses, being lowest with chlorhexidine and highest with saline. The plaque area increased 3-fold with the phenolic rinse and 6-fold with the saline rinse compared to the chlorhexidine rinse. Similarly, gingivitis increments were lowest with chlorhexidine and highest with saline but differences between rinses did not reach significance. Staining was significantly different between rinses, primarily due to minimal staining associated with the saline rinse. Staining occurred with both the chlorhexidine and phenolic mouthrinses. It is concluded that the 0.2% chlorhexidine rinse offers greater oral hygiene benefits than the phenolic rinse. The question of indications and durations of use of mouthwash products should be addressed.
The purpose of this study was to investigate the effects of cleaning and polishing methods on primary enamel surfaces. Fifty-nine extracted or exfoliated caries free primary anterior human teeth were used. The cleaning and polishing methods used in this study were as follows: application of 10% NaOCl, polishing with a brush cone or a polishing brush at a low speed (600-6000 r.p.m.), polishing with a brush cone and various polishing pastes, cleaning with an air polisher Prophy-Jet or Quick-Jet with NaHCO3 powder and water. The following observations were obtained using the SEM: (1) Air polishing systems were useful for cleaning the enamel surface, (2) It was likely that materials such as organic films will remain on the enamel surface polished with a brush cone or polishing brush alone, and (3) The effect of 10% NaOCl application for 30 seconds was the lowest.