A light and electron microscopic study of calcified dental tissues in normal horses
Başlık çevirisi mevcut değil.
- Tez No: 400982
- Danışmanlar: DR. P. M. DIXON, DR. S. A. KEMPSON
- Tez Türü: Doktora
- Konular: Veteriner Hekimliği, Veterinary Medicine
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1995
- Dil: İngilizce
- Üniversite: The Unıversıty Of Edınburgh
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
The structures ot normal equine en;iinei. deniine and cement were examined in 50 teeth from 16 horses. Prior to examinaiion these teeth were fractured, or sectioned by a laihe 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 tiiroughout 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. I h r e c types ot enamel were identilled 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 appearancc 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 45° with both the amclodentinal j u n c t i o n and the occlusal surface. This enamel was found adjacent to the amclodentinal junction. lEquine type 2 enamel contained prisms which ranged from circular to •'horseshoe“ shape on cross section and which were separated f r om each another 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 amclodentinal j u n c t i o n and the occlusal surface. I'his enamel was found adjacent to the amelocementaljunction. Equine type 3 enamel was compo.sed of round shaped prisms completely surrounded by large quantities of interprismatic material and this enamel was inconsistently present in a thin layer at theamclodentinal and amelocemcntal junctions. The largest component of peripheral enamel of upper teeth was type 1, compared to type 2 in the lower teeth. Incisor enamel contained increased proportion of type 2 enamel and unlike in cheek teeth, this consisted of bands of prisms that were aligned vertically, obliquely or horizontally to the occlusal surface. The diameters of types I and 2 enamel prisms were significantly greater in incisors than in cheek teeth. Dentinal tubules were branched at the amclodentinal junction and extended towards the pulp cavity tollowing straight vertical, oblique or ”S" shaped courses depending on their origin in the teeth. Tlie tubules of primary dentine were surrounded by a variable thickness of peritubuhir dentine and their position within the peritubular dentine varied f r om central to asymmetrical depending on their orientation in the teeth and the relationship between the origin of the dentinal tubules and the main pulp cavities. In primary deniine. the amount of intertubuiar dentine decreased and conversely the diameter of dentinaltubules and the amount of pi^ritubular dentine increased, from the amclodentinal junction towards thej u n c t i o n ot prim;\ry and secondary deniine. In regular secondary dentine peritubular dentine was absent,but the amounts of intertubuiar dentine and the density of dentinal tubules were increased compared to primary dentine. In irregular secondary dentine, the lumina ol all dentinal tubules were obliterated. The number of dentinal tubules containing odontoblast processes increased from the amclodentinal junction to the junction of primary and secondary dentine. Dentinal tubules with double odontoblast processes wereoccasionally found. Regular secondary deniine contained many dentinal tubules without odontoblastprocesses. Peritubular dentine had a compact appearance and a smooth surface in untreated sections, but when etched it became rough and obliquely oriented canaliculae became apparent. Equine cement contained lacunae which u.sually contained one, but tKcasionally two cementocytes. Significant differences were present between the diameters of cellular lacunae of infundibular and peripheral cement of upper and lower check teeth, but the ratio of lacunae: total cement volume and the number of lacunae/ unit area were non-signiilcantly different between the same regions of equine cheek teeth cement. Two types of cemental defects were found, the first appearing as small round spaces along the amelocemental junction of both upper and lower cheek teeth. The second type was found only in infundibular cement and represented the site of the former vasculature. Peripheral cement was deposited both directly, i.e. on unresorbed or resorbed enamel surface or indirectly, where the cement was separated f r om enamel by a thin calcified organic layer.
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