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Title: A light and electron microscopic-study of calcified dental tissues in normal horses
Author: Kilic, S.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1996
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The structures of normal equine enamel, dentine and cement were examined in 50 teeth from 16 horses. Prior to examination these teeth were fractured, or sectioned by a lathe or diamond saw. Specimens were examined without further treatment or after acid etching or decalcification. Measurements of enamel thickness showed that in the transverse plane enamel thickness varied greatly throughout its folds, but that its thickness remained constant throughout the lengths of the tooth. Enamel was thickest in areas parallel to the long axis of the maxilla. Three types of enamel were identified on scanning electron microscopic (SEM) examination and were termed equine types 1, 2 and 3 enamel according to the shapes of their prisms on transverse section and the amount and appearance of interprismatic enamel they contained. Equine type 1 enamel contained rows of prisms that were oval on cross section and were separated by thick interprismatic enamel plates. Equine type 1 enamel prisms were oriented at an angle of approximately 45o with both the amelodentinal junction and the occlusal surface. This enamel was found adjacent to the amelodentinal junction. Equine type 2 enamel contained prisms which ranged from circular to "horseshoe" shape on cross section and which were separated from each other by thin organic prism sheaths, with no interprismatic enamel present. Equine type 2 enamel prisms were oriented at a wide variety of oblique angles to the amelodentinal junction and the occlusal surface. This enamel was found adjacent to the amelocemental junction. Equine type 3 enamel was composed of round shaped prisms completely surrounded by large quantities of interprismatic material and this enamel was inconsistently present in a thin layer at the amelodentinal and amelocemental junctions. The largest component of peripheral enamel of upper teeth was type 1, compared to type 2 in the lower teeth.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available