Research Outputs (Oral Health Sciences)
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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 A qualitative and quantitative histochemical investigation of the effects of pilocarpine stimulation on amylase levels in rat submaxillary and parotid glands(Sagepub, 1973) Shear, M.; Gibson, S.; van der Merwe, E.A histochemical study, using the starch substrate film technique, was done to compare amylase activity in fresh-frozen cryostat sections of paired male rat parotid and submaxillary-sublingual glands, before and after pilocarpine stimulation. A quantitative procedure was followed on the same material. Amylase depletion was apparent in sections of parotid gland incubated on starch films for short periods. Quantitative estimations on adjacent sections showed an amylase depletion of about 50%. In the submaxillary-sublingual gland, amylase was demonstrable in the blood vessels in both unstimulated and stimulated material and there appeared to be a higher concentration of the enzyme in the latter. Quantitative assays on adjacent sections demonstrated a very considerably raised level of amylase activity in the stimulated submaxillary gland. It was concluded that the histochemically demonstrable amylase in the blood vessels of the submaxillary and sublingual glands was blood amylase and that the raised level following pilocarpine stimulation might be interpreted as a passage to the blood of enzymes produced by other glands under the same stimulus.Item The effect of frozen irradiated bone homografts on the healing of defects in the mandible and femur of the rat(1971) Cleaton-Jones, P. E.; Retief, D. H.; Maier, G.1. The effects of frozen irradiated homogenous bone grafts on the healing of circumscribed defects in the mandibles and femora of forty albino rats have been studied. 2. The grafts were well tolerated by the host animals and did not appear in any way either to stimulate or to inhibit osteogenesis. The rate of healing of the defects containing the homografts compared favourably with that of the control defects.Item Clinical experience with an epoxy resin adhesive for direct bonding of orthodontic attachments*(1972) Dijkman, J. F. P.; Retief, D. H.An epoxy resin formulation developed in the Dental Research Unit has been subjected to further clinical trials. Six patients, were used in the study. They were divided into two age groups and all the teeth, including the first molars, bonded. Rubber dam was used to keep the crowns dry during the setting period of the resin. In the younger group the mean failure rates were 27 per cent for anterior teeth and 70 per cent for the first molars. In the older group these rates were 11 per cent for incisors, 11 per cent for canines, 20 per cent for premolars and 20 per cent for first molars. While no figures are available in the literature relating to direct bonding to first molars, the results obtained in this study for the other teeth compare favourably with data previously published by other authors after trials using other types of cement.Item The palatal vault in adult South African Bantu-speaking Negroids(1970) Cleaton-Jones, P.Item Papain in the treatment of bilateral cleft palates(1970) Dreyer, C. J.; Gavron, G.; Cleaton-Jones, P.Item Abnormal behavioural patterns in dogs with cleft palates(1973) Dreyer, C. J.; Preston, C. B.Item A metrical study of some periodontal structures in the Vervet Monkey(1973) Volchansky, A.; Cleaton-Jones, P.Item Protein-deficient diet, fluoride and amelogenesis(1972) Jansen van Rensburg, B. G.