Faculty of Health Sciences

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Failure at the dental restorative-etched enamel interface
(1973) Retief, D. H.
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.
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.
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.
Analyses of marginal seals in aged amalgam restorations using extraction replicas
(1984) Grossman, E. S.; Witcomb, M. J.; Jodaikin, A
Since 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.
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.
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.
The Auricle. 1963; April
(The Students` Medical Council University of the Witwatersrand, 1963-04) Students` Medical Council
The Auricle. 1963; March
(The Students` Medical Council University of the Witwatersrand, 1963-03) Students` Medical Council
The Auricle. 1963; February
(The Students` Medical Council University of the Witwatersrand, 1963-02) Students` Medical Council

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