Date of Award
PhD (Doctor of Philosophy)
Professor C.D. Lynch
Tooth Abnormalities, Camelus
Introduction: Hunter-Schreger Bands (HSBs) are an optical phenomenon seen in mammalian tooth enamel related to orientation changes in the enamel prisms. HSBs are considered a factor in the development and progress of certain clinical conditions, including tooth wear, the resistance of enamel to fracture, cracked tooth syndrome, enamel bonding, abfraction, and vital tooth bleaching. They can also be used for personal identification in automated systems.
No previous investigations have described HSB patterns, or quantified their distribution, in camel teeth.
Aim: The aim of this study is to describe the dental morphology of the dromedary camel and examine the HSBs in the anterior teeth both qualitatively and quantitatively, availing of the opportunity to review the anatomy of the camel skull and the superficial muscles of mastication.
Method: 194 deciduous teeth and 35 permanent teeth were extracted from the skulls of ten juvenile camels, from which 220 teeth were included in this study. The dentitions in the skulls of six mature camels in the Hunterian Museum of RCSEng in London were also examined. Ground longitudinal sections were made from 49 anterior teeth in the mid-mesiodistal and mid-buccolingual planes. Reflected light photomicroscopy was used to demonstrate the HSBs and quantify their packing density. Two techniques to enhance the appearance of HSBs were tested. Statistical analyses were performed.
Results: The anatomy of the skull and superficial muscles of mastication and the morphology of the dentition was described. Consistent patterns of variation in HSB packing density in different parts of the enamel was demonstrated. An acid-etch application and an acidic drink treatment successfully enhanced the appearance of the HSBs.
Conclusion: The morphology of the teeth in the dentition of Camelus Dromedarius is quite complex, and HSBs are present in their tooth enamel with a predictable pattern of variation in their packing density.
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Radhi A. A Quantitative Study of Hunter-Schreger Brands in the Tooth Enamel of Camelus Dromedarius [PhD Thesis]. Dublin: Royal College of Surgeons in Ireland; 2017.
Available for download on Friday, November 30, 2018