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Journal of Dental & Oro-facial Research Vol 13 Issue 02 Aug 2017 JDOR
RUAS 61
Modified Palatal Crib Appliance for Habit Correction:
A Case Report
*Shwetha G.1, Ashmitha K. Shetty2, Usha R.3 and Pushpalatha C.4
*Corresponding Author Email: gshwetha247@gmail.com
Contributors:
1Assistant Professor,
2,4 Reader,3 Lecturer,
Department of Pedodontics and
Preventive Dentistry, Faculty of
Dental Sciences, M.S. Ramaiah
University of Applied Sciences,
Bengaluru - 560054
Abstract
Digit sucking is the most commonly seen oral habit & one of the most common
learned patterns of behaviours seen in children of preschool age and is a habit of
concern as it is an important etiological factor in the development of malocclusion,
a secondary tongue thrust develops leading to the exaggeration of the condition. To
plan an appropriate treatment it is important to understand the etiology, which
includes psychological, physiological and anatomical and planning for behavior
eradication is critical for the positive outcomes. Starting from counselling to
appliance therapy, ample treatment modalities have been reported in the literature.
Many appliances have been developed for habit correction and have been modified
depending on the patient compliance. Palatal crib is one such appliance for treating
digit sucking habit & tongue thrusting. This case report describes a 12-year-old girl
who reported to our department with a history of digit sucking habit which was
intervened using modified palatal crib appliance.
Keywords: Modified Palatal Crib, Habit Breaking Appliance, Digit Sucking Habit,
Tongue Thrusting Habit
Introduction
Habit is defined as a fixed practice produced by a
constant repetition of an act1. Oral habits are
common in children. These habits include: non-
nutritive sucking habits (thumb/finger/pacifier),
tongue-thrusting, tongue sucking, lip or nail
biting habits & bruxism. Non-nutritive sucking
habit comprises the use of pacifiers, blankets and
digit sucking. The term digit sucking is
synonymous with finger sucking or thumb
sucking. It is defined as the placement of the
thumb or one or more fingers in various depths
into the mouth. The prevalence of this habit as
reported by investigators ranges from 1.7% to
47%2. This habit develops early in life around 29
weeks of age and continues from infancy through
primary, mixed and permanent dentition. If the
habit continues into the mixed dentition a
malocclusion may develop3.Proffit and Mason
defined tongue-thrusting habit as the protrusion
of the tongue against or in between the anterior
dentition with excessive circumoral muscle
activity during swallowing. They also stated that
one or more of the following conditions should
exist to define the thrust: first, the tongue should
move forward to contact the lower lip during
swallowing. Secondly, the forward movement of
the tongue between the anterior teeth during
speech may be observed. Finally, a forward
positioning of the tongue with the tip of the
tongue positioned between or against the anterior
teeth at rest.4
Various side-effects of these habits are anterior
open bite, increased overjet, labial inclination of
upper incisors & lingual inclination of lower
incisors, Posterior cross bite. Spontaneous
correction of the dental changes occurs if the
habit ceases before the age of 5 years and thus do
not require any treatment.5,6 The treatment
approaches for these habits should be carried out
in the following stages7
1. Direct counselling of the patient
2. Reminder therapy
3. Rewards concept
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4. Orthodontic appliance treatment.
This paper describes the clinical case report of a
12-year-old girl whose habit was corrected using
a modified palatal crib appliance.
Case Report
A 12-year-old girl accompanied by her mother
reported to the Department of Pedodontics and
Preventive Dentistry, Ramaiah University of
Applied Sciences Bengaluru, with a chief
complaint of digit sucking habit since she was 2
years old. A detailed history was recorded;
mother revealed that the child is practicing digit
sucking habit regularly for 8-9 hrs/day during
waking hours, also reported that the patient had
speech problems and was undergoing speech
therapy. On examination callous formation was
seen over the right middle and ring finger and
places her digits up to her 1st phalanges.[fig.1] As
duration and intensity of digit sucking was
intense, the child presented with anterior open
bite with simple tongue thrusting. [fig.2] & was
in mixed dentition stage and reversible pulpitis
wrt 85 which was restored using GIC type II. All
the other methods of habit cessation attempted
had failed in this patient. Thus appliance therapy
was planned. A fixed habit breaking appliance,
i.e., a palatal crib was planned and modification
was done to the palatal crib as the patient had
speech problems. Accordingly the first molars
were banded, and alginate impression was made.
The crib was fabricated on the cast using a 0.8mm
stainless steel wire8, then the joints of the crib
were soldered, and over the crib small round
beads were placed using silver solder [fig.3]. In
the next appointment, the appliance cementation
was done using GIC type I [fig.4] The patient
reported again after 2 weeks, mother gave a
positive feedback about the regression of the
habit. There were observable changes on the
finger, while follow-up check-up after 3 months
showed a marked reduction in the habit and the
callous formation on the digit had resolved
completely. Patient was asked to wear appliance
for at least 6 months after the reversal of habit to
avoid relapse of the habit, post-treatment follow-
up showed no relapse. After that period of 6
months, the appliance was removed.
Discussion
The habit of sucking the finger (or thumb) is
considered to be performed for oral gratification
and psychological reassurance. Severe digit
sucking can lead to proclination of maxillary
anteriors, constriction of the maxilla,
retroclination of the mandibular incisors,
increased overjet and anterior openbite9.
Usually, in cases with anterior open bite due to
thumb sucking, a secondary tongue thrust
develops leading to the exaggeration of the
condition. The line of treatment for the prolonged
digit sucking involves positive reinforcements,
developing a desire in the patient to quit the habit,
reminders and appliances which act as a
mechanical barrier as well as physical reminders.
Appliances consisting of cribs in the anterior
region are found to be very effective as reminders
as well as physical restrainers10-13.
In the present case the patient had digit sucking
habit along with tongue thrusting and also
reported to have difficulties during speech. To
plan an appropriate treatment it is important to
understand the etiology that includes
psychological, physiological and anatomical and
planning for behaviour eradication for the
positive outcomes.
Counselling to appliance therapy, ample
treatment modalities have been reported in the
literature, we planned to counsel the patient first
but there was no change in the habit. Hence we
planned to give an appliance to break both the
habits, but considering the speech problem, we
planned to modify the palatal crib appliance so
that there is no interference with the speech.
Pathophysiology of Finger-sucking Damage to
Occlusion
Several studies have been conducted to
understand the pathophysiology of finger-
sucking damage to the occlusion.
`Journal of Dental & Oro-facial Research Vol 13 Issue 02 Aug 2017 JDOR
RUAS 63
Fig. 1 Digits showing callous formation
Fig. 2 Patient showing anterior open bite with
simple tongue thrusting
A study by Ahlgren to examine the activity of the
mentalis, buccinator and lip muscles during non-
nutritive sucking habits using Electromyography
(EMG) found more electromyographic activity in
the lip and mentalis muscles than in the
buccinator muscle.14
Fig. 3 Fabrication of the modified palatal crib
appliance
Fig. 4 Cementation of the appliance
Proffit stated that the anterior open bite
malocclusion seen in thumb-sucking individuals
is caused by interference to eruption of the
incisors accompanied by eruption of the posterior
teeth. He indicated that the possible cause for the
posterior crossbite malocclusion is a combination
of lower tongue position and increased cheek
activity during sucking.15 On the contrary to what
Proffit hypothesized, Larsson and Ronnerman in
a comparative study in children aged between 9-
13years with prolonged finger sucking habit and
children without habit found that modelling of the
alveolar process was probable cause for open bite
and not the arrested eruption of the incisors. Once
the habit is stopped the inhibition of the vertical
growth of the anterior maxillary process might
self-correct, permanent effects on occlusion is
anticipated and self-correction might not occur if
the child continues the finger-sucking habit after
pubertal growth.16 Possible factors leading to
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retention of this abnormal malocclusion include
abnormal tongue and lip functions.
Effects of Tongue-thrust on Occlusion and
Speech: The effects of tongue-thrust on occlusion
have been the subject of controversy. Tongue-
thrust habit may be a contributing or a
maintaining factor in malocclusion, lisping or
both. Tongue-thrusting has been associated with
speech problems, like anterior lisp and
articulatory problems with some consonants such
as S, Z, T, D, L, and N17,18. Depending on the
severity of malocclusion and the child’s
compensative ability, the open bite may result in
articulation errors19. Tulley in a survey examined
over 1,500 11-year-old school children for a
tongue-thrust habit found that some children
displayed lisping in their speech though they had
an excellent occlusion20.
Relationship between Tongue-thrust and Thumb-
Sucking: All open bites are accompanied by a
tongue-thrust. In cases of the thumb-sucking
habit, spontaneous correction of the open bite
usually occurs after the elimination of habit
except in cases where there are other associated
habits. Other habits could include tongue-
thrusting, mouth breathing and hyperactive
perioral muscles21. In a case control study of 723
children aged 10-11 years, it was found that
children with thumbsucking habit showed an
increased tendency of tongue-thrust swallow and
teeth apart swallow compared to the control
group22. da Silva Filho et al in a study found the
difference that, in thumb-sucking subjects the
anterior open bite was circular in contour, in
tongue-thrust swallow it was diffuse or
rectangular in shape21.
Conclusion
Prolonged finger-sucking habit is a risk factor in
malocclusion predominantly anterior open bite. A
posterior crossbite might be associated with the
finger-sucking habit, but it occurs more with
prolonged pacifier use. It was found that the
longer the habit, the more the associated damage
to the primary and permanent dentition. Methods
for habit intervention include counselling,
positive reinforcement, a calendar with rewards,
an adhesive bandage, bitter nail polish, long
sleeves and appliance therapy. It is recommended
to start with the least invasive methods before
using habit breaking appliances. Some children
need additional help to stop the habit and in that
case habit-breaking appliances are indicated.
Habit-breaking appliances are either fixed or
removable. One of the fixed appliances used to
break the habit is the palatal crib appliance.
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