Browse
Recent Submissions
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 Preservation of residual hearing after cochlear implant surgery an exploration of residual hearing function in a group of recipients at cochlear implant unitsKatherine Gautschi; Katijah Khoza-Shangase; Dhanashree PillayItem The burden of oral conditions among adolescents living with HIV at a clinic in Johannesburg South AfricaYolanda Kolisa; Veerasamy Yengopal; Khumbo Shumba; Jude IgumborItem Comparative analysis of healthcare provision to individuals with cleft lip and or palate at specialised academic centres in South AfricaPhumzile Hlongwa; Tarisai Dandajena; Laetitia RispelItem Health care reform in Iran Implications for nurses moral distress patient rights satisfaction and turnover intentionM Hatamizadeh; Mohammadali Hosseini; Colleen Bernstein; H RanjbarItem Epidemiology and clinical profile of individuals with cleft lip and palate utilising specialised academic treatment centres in South AfricaPhumzile Hlongwa; Jonathan Levin; Laetitia RispelItem Failure at the dental restorative-etched enamel interface(1973) Retief, D. H.Item Failure at the dental restorative etched enamel interface(1973) Retief, D. H.None of the restorative materials available to the dental profession adhere to tooth structure. The bonding of these materials could be greatly increased by etching the enamel surface prior to the placement of the restorative material. Conditioning of the enamel surface with phosphoric acid or an attenuated phosphoric acid solution is now an accepted procedure and widely applied in restorative and preventive dentistry.Item 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 A comparative sem study of keratinized and non-keratinized oral mucosa of the vervet monkey(1981) Grossman, E. S.; Cleaton-Jones, P. E.Scanning electron microscopy has revealed that the surfaces of keratinized and non-keratinized oral epithelial cells have characteristic features which enable these tissue types to be readily distinguished. These features include pits, villus-like projections and ridge-like folds called microplications. The origin and functional significance of these structures is not known, although several hypotheses have been proposed. Microplications have been interpreted as a reserve area for cell stretching but further studies have yielded conflicting results. Cellular interdigitation resulting from the microplications may aid adhesion between the stratified epithelial cells. This view has been supported by subsequent investigations of superficial epithelial cells. The situation in the deeper cell layers is not entirely clear.Item Intercellular junctions in the attached gingiva and alveolar mucosa in the vervet monkey (cercopithecus aethiops)(1979) Grossman, E. S.; Austin, J. C.; Cleaton-Jones, P.This study was undertaken to determine the distribution of hemidesmosomes on the basal cell membranes adjacent to the basement lamina and the spinous cell membranes on unloaded keratinized AG and non- keratinized AM.Item Analyses of marginal seals in aged amalgam restorations using extraction replicas(1984) Grossman, E. S.; Witcomb, M. J.; Jodaikin, ASince dental amalgam does not bond chemically to tooth structure, a microcrevice is present at the amalgam/tooth interface of a freshly placed restoration. This gap is of sufficient width to allow fluids and microorganisms to pass along the cavity walls and thereby facilitating the recurrence of dental caries, which accounts for the majority of amalgam restoration replacements.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 Ultrastructural features of exfoliating surface cells in keratinised and non-keratinised oral mucosa(1979) Austin, J. C.; Grossman, E. S.; Cleaton-Jones, P.Healthy keratinised and non-keratinised oral mucosa (attached gingiva and alveolar mucosa) were obtained from 6 adult vervet monkeys, fixed in situ by simultaneous perfusion and immersion fixation using cacodylate buffered 2,5% glutaraldehyde and prepared for examination by SEM and TEM.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.