Research Outputs (Oral Health Sciences)
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Item How to set about a research project(1986) Cleaton-Jones, P.Item Cemento-enamel junction variability within the mouth(1988) Grossman, E. S.; Hargreaves, J. A.Item Writing a research report, dissertation or thesis(1986) Cleaton-Jones, P.Item Seal development and composition at amalgam-ceramic interfaces after NaCl and Na2S storage(1987) Jodaikin, A.; Grossman, E. S.; Witcomb, M. J.Item Base solubility and marginal sealing in amalgam restored teeth(1991) Grossman, E. S.; Witcomb, M. J.; Matejka, J. M.Item Social class and dental caries in 11-12-year-old South African schoolchildren(1989) Cleaton-Jones, P.; Hargreaves, J. A.; Williams, S. D. L.; et al.The objective of this study was to examine effects of social class on dental caries in five African populations. Definitions of social class that could be used for the different ethnic groups are outlined. A total of 1 154 children from rural black, urban black, urban Indian, urban coloured and urban white groups were clinically examined and classified into social class by parental occupations. Within group comparisons showed no statistically significant differences in DMFT or DMFS scores by social class. Comparison of the urban white children to a similar group in South Wales showed slightly lower caries in South African children of similar social class. The complexity of the different ethnic groups in South Africa, in respect of social classification, is difficult to assess for comparison with social systems in developed countries. It is recommended that an appropriate social classification be developed for South Africa ’s developed/developing population mixture. Also as we enter the 1990’s sound baseline caries data need to be collected for longitudinal evaluation of changes in the disease patternItem Marginal adaptation in composite resin restored dentine cavities Showing gross marginal leakage(1986) Grossman, E. S.; Sparrius, O.The aim of bonding composite resin restorations to the tooth is to ensure retention and also to prevent marginal leakage at the tooth restoration interface, a process which can lead to further caries. An in vitro marginal leakage study' of composite resins in combination wTEh acid' etching and dentine and enamel bonding agents highlighted the lower sealing potential of both enamel and dentine bonding agents to dentine (36%>seal) compared to enamel (79%>seal). Several studies 2-4 suggest that if the inner surface of the resin restoration appears as a well replicated negative impression of the adjacent tooth surface, bonding has been achieved. This study was undertaken to examine the appearance of the inner surface of resin restorations which showed gross marginal leakage in restored dentine cavities to determine the degree of marginal adaptation between the restoration and cavity surface.Item Seal development and composition at amalgam-ceramic interfaces after NaC1 and Na2S storage(1987) Jodaikin, A; Grossman, ES; Witcomb, MJChlorine and sulphur -.have been found in the marginal seal of some tooth-amalgam interfaces . Although the role of Cl in the sealing process is relatively well established the role of S remains more obscure. The purpose of the present study was to compare the sealing properties and elemental composition of the seal formed at the interface of amalgams placed in ceramic cavities and stored in either a 10% NaCl or 10% Na2S aqueous solution. This investigation undertaken in a simple controlled environment, devoid of complex oral influences, would clarify the role that these two elements play in the sealing process at amalgam-tooth interfaces within the mouth.Item The effect of enamel etchants and a cleaning agent on cut dentine: an in vitro study(1985) Sparrius, O.; Grossman, E. S.Cavities 1,25 x 2,00mm were prepared in the cervical dentine of extracted human premolar teeth using a no. 577 tungsten carbide bur. The cavity depth was standardised at 1mm with the aid of a depth gauge fitted to the high speed airturbine. The cavities were hemisected with a low speed, water cooled, diamond disc saw, then cleaned with water and air. Thereafter the following solutions were applied to six cavities each as per manufacturers' instructions: Anhydron; Chemfill (Citric Acid); Enamelbond etchant and Scotchbond etchant gel. Once the cavities had been cleaned and dried, the specimens were prepared for scanning electron microscopy (SEM) and viewed at magnifications of x35, x200 and x2000. Cavity walls and floors were viewed separately and representative areas photographed. Similarly prepared unetched cavities served as a control.Item Systematic review of factors influencing oral healthrelated quality of life in children in Africa(2019-07-24) Kolisa Y; Yengopal V; Igumbor J; Nqcobo CBackground: Oral health-related quality of life (OHRQoL) is influenced by cultural and societal context. Existing OHRQoL children measurement tools have been conceptualised in high-income countries. Probing whether the factors influencing OHRQoL are context-reliant in the African setting is necessary and is the purpose of the current review. Aim: To investigate if the factors influencing OHRQoL are context-reliant. Methods: Seven databases were searched using search terms (‘oral health’; and ‘quality of life’, ‘health-related quality of life’, ‘patient-reported outcomes’, ‘well-being’; and ‘child*’, ‘adolescents’, ‘teen*’, ‘youth’; and ‘determinants’, ‘factors’, ‘predictors’; and ‘oral health quality of life tools/instruments/scales’; and ‘Africa*’). Abstracts identified were exported to a reference software manager. Three of the authors used specific selection criteria to review, firstly, 307 abstracts and, secondly, 30 full papers. Data were extracted from these papers using a pre-designed data extraction form, after which quantitative synthesis of data was performed. Results: Key factors influencing OHRQoL followed an existing conceptual framework where environmental and individual factors in the form of socio-economic status (SES), area of residence and children psyche status, and the presence of any oral condition other than dental caries were reported among child populations in Africa. Conclusion: There is preliminary evidence to suggest an association between individual factors such as children’s psyche and oral problems, excluding dental caries, and environmental determinants such as area of residence and SES in children’s OHRQoL in African children. The finding that dental caries was not a key factor in child-oral health is unexpected. There seemed to be a contextual viewpoint underpinning the current OHRQoL frameworks and OHRQoL was context-reliant.