Prof. Angela Harris
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| Position: | Head of Orthodontics |
| Department: | Orthodontics & Paediatric Dentistry |
| Faculty: | Dentistry |
| Qualifications: | PhD FCD(SA) Orthodontics, MChD, Hons BSc (Epidemiology), BChD, Dipl Tertiary Education |
| My publications in this repository | |
| More about me: | here, and here |
| Tel: | 021 937 3105 |
| Fax: | 021 931 2287 |
| E-mail: | ampharris@uwc.ac.za |
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Item Use of the passive lower lingual arch in the management of anterior mandibular crowding in the mixed dentition(South African Dental Association, 2013) Hudson, Athol; Harris, Angela; Mohamed, Nadia; Joubert, Jo-AnneLeeway space preservation in the mixed dentition is a well-documented method of space management. In the mandibular arch it may be saved for utilization 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 dentitionItem Orthodontic molar brackets: the effect of three different base designs on shear bond strength(Master Publishing Group, 2011) Hudson, Athol; Grobler, Sias Renier; Harris, AngelaThe 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 Unitek), Enlight (Ormco) and Sure Ortho Light Bond (Sure Orthodontics). The human enamel specimens (144) were randomly divided into nine groups and each group (n=16) was allocated to a bracket/adhesive combination. The contact surface of each of the bracket bases was measured three dimensionally using a reflex microscope. The base designs were also subjected to further microscopic investigations. The brackets were bonded to the enamel, temperature cycled and the shear bond strength was measured. The size and design of each of the brackets was different. The base size, surface treatment, mesh strand diameter and aperture size of the bracket base mesh have a significant effect on the shear bond strength at the bracket/adhesive interface. The shear bond strengths of all three Ormco bracket/adhesive resin combinations (5.8-6.8 MPa) were significantly lower (p<0.05; Kruskal-Wallis) than the other six bracket/adhesive combinations (9.4-12.1 MPa). The different adhesive types (3 types) could not be mainly responsible for the low shear bond values found for the Ormco bracket. The 3M Unitek combination of the Victory series bracket and Transbond XT adhesive proved to have a high shear bond strength without enamel damage.Item Early identification and management of mandibular canine ectopia(South African Dental Association, 2011) Hudson, Athol; Harris, Angela; Mohamed, NadiaMandibular 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 potential for displacement, impaction and/or transmigration. This paper highlights the value of interceptive treatment once the early signs of an aberrant mandibular canine have been detected.Item Maxillary canine management in the pre-adolescent: A guideline for general practitioners.(South African Dental Association, 2010) Hudson, Athol; Harris, Angela; Mohamed, NadiaThis 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.Item The mixed dentition pantomogram: A valuable dental development assessment tool for the dentist(South African Dental Association, 2009) Hudson, Athol; Harris, Angela; Mohamed, NadiaThe 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 the canines will be reviewed.