Angela Harris

Angela Harris
University of the Western Cape | uwc · Department of Orthodontics

PhD, MChD Orthodontics, FFD (SA) Orthodontics, BChD, Hons BSc, Dipl Ter Educ

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39
Publications
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702
Citations

Publications

Publications (39)
Article
Full-text available
Leeway space preservation in the mixed dentition is a well-documented method of space management. In the mandibular arch it may be saved for utilisation in the correction of minor anterior crowding by the placement of a passive lower lingual arch (LLA) during the transition from the mixed dentition to the permanent dentition.
Article
Full-text available
Mandibular canine impaction and transmigration have serious consequences for the patient, as removal of the tooth or teeth in question is often the only solution. The loss of one or both mandibular canines complicates orthodontic treatment. Early warning signs of mandibular canine ectopia are explored in this paper as well as how to assess the pote...
Article
Full-text available
The purpose of the study was to assess the relative base designs of three different maxillary molar stainless steel brackets with reference to the shear bond strength of three different adhesive resins. The molar brackets used were Victory series (3M Unitek), Upper Molar (GAC) and Optimesh XRT (Ormco). The adhesives used were Transbond XT (3M Unite...
Article
Full-text available
This paper focuses on the identification of ectopic eruption patterns of the maxillary canines from the dental ages of approximately 8 to 12 years. The timing and suitability of interceptive treatment in pre-adolescents are discussed.
Article
Full-text available
The mixed dentition pantomogram is routinely used in paediatric patients. This paper discusses the value of the pantomogram for early identification of problems in dental development during the mixed dentition stage. Aspects regarding dental maturity, leeway space, the sequence of eruption of the permanent teeth, anomalies and the development of th...
Article
Full-text available
Infraocclusion of primary molar teeth is a relatively common clinical finding and decision-making concerning the successful management of such cases can present a challenge to the general dental practitioner. This paper reviews the epidemiology, aetiology, diagnosis, treatment rationale and includes flow charts for easy reference to the various tre...
Article
Full-text available
An investigation was conducted to determine the outcome of nonextraction edgewise orthodontic treatment of thirty-five caucasian patients with Class II molar relationships (13 division 1 and 22 division 2 cases). Twenty-three females and 12 males aged between 10 and 16 years old were treated using Class II intermaxillary elastics worn with 0.016" x...
Article
Full-text available
Foetal alcohol syndrome (FAS) consists of multi-system abnormalities and is caused by the excessive intake of alcohol during pregnancy. The teratogenic effect of alcohol on the human foetus has now been established beyond reasonable doubt and FAS is the most important human teratogenic condition known today. The purpose of this study was to analyse...
Article
Full-text available
An investigation was conducted to determine a simple, effective method for reconditioning stainless steel orthodontic attachments in the orthodontic office. In total, 100 new brackets were bonded to premolar teeth, then debonded and the bond strength recorded as a control for the reconditioning process. The debonded brackets were divided into six g...
Article
The Visual Treatment Objective (VTO) is an extremely valuable tool in the process of working out the treatment plan for the individual. This is especially true for the inexperienced operator. Often it becomes clear that extractions are indicated, but there remains uncertainty as to which teeth should be chosen for extractions to give the best resul...
Article
The primary objective of this investigation was to provide a means of predicting the horizontal growth of the nose in growing individuals. Mathematical formulae were statistically derived and incorporated into a software program.
Article
Most dental patients are treated in the supine position, enhancing the risk of accidental aspiration or swallowing of foreign objects. This article presents a case report of an orthodontic patient who accidentally ingested a section of orthodontic wire and coil spring from a fixed expansion device placed in the maxillary dental arch. Some guideline...
Article
A prospective radiological study of 96 patients with mandibular condylar neck fractures was undertaken to assess frequency and nature of mandibular condylar displacement. Data collected included age, gender, aetiology, and anatomical site of fracture and direction of displacement. Men aged 20-29 years sustained the majority of condylar fractures. A...
Article
The possibility that personal lead shielding devices can increase absorption of radiation has not been entertained. The purpose of the present investigation specifically was to determine whether pituitary dose might be increased when a leaded apron and thyroid collar are used. Thermoluminescent dosimeters (TLDs) were used to measure absorbed dose....
Article
The primary object of this research project was to establish the amount of incisor retraction to be expected during full fixed mechanotherapy and to generate regression models that could provide more accurate prediction of each of the three most popular combinations of symmetrical premolar extractions, where extraoral anchorage would not be used. P...
Article
In this study the wear of mandibular acrylic resin teeth opposed by porcelain maxillary teeth arranged in a lingualized occlusal scheme over a period of 3 years was measured. Six edentulous subjects received complete dentures as above and with three baseline markers of amalgam. At yearly intervals casts were made of the mandibular occlusal surfaces...
Article
A table is presented by means of which changes in arch length and arch circumference can be more accurately predicted, thereby simplifying treatment planning for cases with special problems, e.g. a Bolton discrepancy. A fundamental condition for the use of this table is that the anterior arch from canine to canine forms a parabolic curve.
Article
Certain craniofacial characteristics were identified on the lateral cephalograms of 40 untreated subjects with shallow mandibular antegonial notches and 40 subjects with deep notches. Subjects with shallow notches demonstrated more on the morphological characteristics usually associated with horizontal mandibular growth patterns than did subjects w...
Article
Biostereometric evaluation of denture tooth wear in 25 subjects was used to determine whether there was a relationship between the gonial angle, mandibular length, Frankfort-mandibular angle, and abrasion of denture teeth. The results of this study indicated no correlation could be demonstrated between any of the factors.
Article
The Angle and Steiner classifications are used extensively in orthodontics. The prevalence of malocclusions in Caucasian patients living in the Western Cape was determined using both classifications and the degree of concordance of the data thus obtained was ascertained. A high prevalence of Angle Class I and II was found. No statistically signific...
Article
A 3-year longitudinal study on Heck's disease among school children was undertaken in 2 communities which are similar geographically, socioeconomically and ethnically. The variations in the annual prevalence rates (7% to 13%), the incidence rates per 1000 (38 to 68), the female to male ratios (1:0.4 to 1:1) and the average ages of the affected pupi...
Article
Anecdotal reports of bracket fracture and tooth damage associated with the use of certain esthetic orthodontic brackets have been reported in the literature. With the advent of new esthetic orthodontic brackets, the need has arisen to test the claims of the manufacturers. The objectives of this study were to determine: (1) shear peel bond strengths...
Article
The skeletal growth patterns of 103 subjects with Class I and III malocclusions were cephalometrically analyzed as advocated by Ricketts el al. to assess abnormal mandibular growth. The surface area (mm2) of the frontal sinus was assessed by a Summagraphics decoder linked to a microcomputer. The results indicate that there is a significant correlat...
Article
A tissue-equivalent anthropomorphic human phantom was used with a lithium fluoride thermoluminescent dosimetry system to evaluate the radiation absorbed dose to the ovarian and testicular region during dental radiologic procedures. Measurements were made with and without personal lead shielding devices consisting of thyroid collar and apron of 0.25...
Article
Full-text available
Previous authors have focused on technical, radiographic and perceptual aspects of dental radiology but scant attention has been paid to the thought processes and recording methods used in interpretation. The purpose of this investigation was to test the efficacy of a report-form template for radiological interpretation. Sixty-four senior dental st...
Article
In 1893, C. Garrè published an article dealing with the manifestations of acute osteomyelitis. Since then, his name has been associated with diseases such as Garrè's osteomyelitis, chronic sclerosing osteomyelitis, and periostitis ossificans, among others. Scrutiny of a translated version of the original article reveals that Garrè was not responsib...
Article
Four cases of intentional knife wounds of the maxillofacial region are presented. In all instances the patients were conscious at the time of admission, with a knife blade in situ. Treatment consisted of simple removal of the knife. Post surgical recovery was rapid and uneventful. No fatalities resulted and no permanent vascular or neurological dam...
Article
Radiographs of 25 patients with true ankylosis of the temporomandibular joint were compared with those of a group of age- and sex-matched controls for radiologic signs of temporomandibular joint ankylosis. Antegonial notching, elongation of the coronoid processes, dento-alveolar compensation and altered posterior tooth position on the affected side...
Article
Standardized radiographs of 60 adult black patients (30 female, 30 male) were compared with an identical number of patients from the Cape Coloured ethnic group. Features examined included sinus height, sinus width, perimeter, number of edge loculations, inter-orbital distance and sinus area. Measurements were compared between races and sexes using...
Article
The various methods of evaluation of radiopaque foreign bodies of the maxillofacial region are reviewed. Emphasis is placed on a systematic approach to the successful interpretation of images rather than radiographic technical methods. The weakness of panoramic radiographs in the localization of foreign bodies of this area is stressed.
Article
The image of the frontal sinus, as seen on rigidly standardized occipitomental radiographs, was analysed in 32 randomly selected patients from the same racial group. Radiographic tracings were compared and definite differences in sinus height, width, and number of edge loculations were seen between patients, with no two sinuses being alike in appea...
Article
The aims of this study were to determine the distribution of focal epithelial hyperplasia (FEH) among Cape Coloured communities, and whether a family connection could be traced. Two isolated communities near Cape Town were selected and it was attempted to examine as many population members as possible. After it was established that one community ha...

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