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 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 healing mechanism in artificially created circumscribed defects in the femora of albino rats(1962) Melcher, A. H.; Irving, J. T.Item The effect of implanting various substances into artificially created circumscribed defects in rat femurs(1963) Melcher, A. H.; Irving, J. T.