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 The relation between the action of vitamin E and protein in the body, and the influence of various fish-liver oils in the diet upon vitamin E activity in vivo(1955) Irving, J. T.; Budtz-Olsen, O. E.Item Alkali resistant haemoglobins from normal and sickle cell bloods(1955) Anderson, C. G.Item The relation between the action of vitamin E and protein in the body, and the influence of various fish-liver oils in the diet upon vitamin E activity in vivo(1955) Irving, J. T.; Budtz-Olsen, O. E.The experiments reported here were undertaken primarily to investigate further the histological changes occurring in the enamel organ of the rat’s incisor tooth during vitamin E deficiency. These changes were originally described by Irving (1942) and have been confirmed in general by Granados, Mason & Dam (1945, 1946) and by Pindborg (7950, 1952). It was, however, found by the present writers, usinga diet based on that of Gillman, Gilbert, Gillman & Spence (1952), that extreme changes in the enamel organ, avertable by vitamin E, could be produced in 21 days or less, whereas the changes described by the other authors took much longer to develop and were less extensive. In an attempt to determine further the effects of other dietary factors upon the enamel organ, certain additional findings seemed to be of significance. The present paper is concerned chiefly with these, and an account of the histological aspect is being prepared for publication. In particular it was found that the vitamin content of the oil containing highly unsaturated fatty acids was of importance and also that the actions of protein and vitamin E, which superficially appeared similar, differed in certain fundamental respectsItem Sectioning of the inferior dental nerve in rats(1969) Retief, D. H.; Dreyer, C. J.Item Relationship between fluoride concentration in enamel, DMFT Index, and degree of fluorosis in a community residing in an area with a high level of fluoride(1976) Bischoff, J. I.; Van Der Merwe, E. H. M.; Retief, D. H.; et al.The DMFT index, degree of fluorosis (DEGF), fluoride concentration in enamel (F), and depth of etch (D) were determined in participants living in an area with a high fluoride level. A statistically significant difference was found between men and women for F and D. A significant correlation was established between F and DEGF and between F and age for men, but not for women.Item Mitotic activity in the oral epithelium of the albino rat(1976) Cleaton-Jones, P.In groups of Wistar rats 3 and 12 months of age, colchicine and radioautography were used to assess mitotic activity in oral epitheliums. Apparent mitotic activity in the epitheliums of the cheek, hard palate, and central, intermediate, and lateral zones of the soft palate depended on the method used and the age of the rat.Item Radioautographic study of mesenchymal cell activity in the secondary palate of the rat(1976) Cleaton-Jones, P.Fifteen µCi of ³H-thymidine was injected into the amniotic cavity of fetal rats from day 15 to 19 postinsemination. Analysis of radioautographs from these rats did not show increased mesenchymal cell activity to be responsible for medial rotation of the palatal shelves. Variations in cell activity in the older fetuses were mainly due to developing bone and glands.