Faculty of Health Sciences
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Item How to set about a research project(1986) Cleaton-Jones, P.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 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.