Kilic S, Dixon P M, Kempson S A
Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin, Midlothian, UK.
Equine Vet J. 1997 May;29(3):206-12. doi: 10.1111/j.2042-3306.1997.tb01670.x.
Ultrastructural examinations of equine dentine found that dentinal tubules extended from the amelodentinal junction towards the pulp forming primary curvatures. The number of dentinal tubules/unit area and their diameters increased significantly from the amelodentinal junction towards the pulp cavities, particularly in regular secondary dentine, but irregular secondary (tertiary) dentine contained no dentinal tubules. Dentinal tubules contained odontoblast processes that appeared to extend as far as the amelodentinal junction, but due to iatrogenic loss during specimen preparation, odontoblasts were seldom found in regular secondary dentine. In primary dentine, the dentinal tubules were surrounded by large amounts of peritubular dentine that increased in diameter from the amelodentinal junction towards the junction of primary and secondary dentine. The site of the dentinal tubule within the peritubular dentine varied at different dentinal sites. Peritubular dentine was present in primary dentine only and was surrounded by a thin layer of intertubular dentine. When acid etched, peritubular dentine gave dentine a honeycomb appearance adjacent to the junction of primary and secondary dentine.
马牙本质的超微结构检查发现，牙本质小管从釉牙本质界向牙髓延伸，形成初级弯曲。单位面积内牙本质小管的数量及其直径从釉牙本质界向牙髓腔显著增加，特别是在规则的继发性牙本质中，但不规则的继发性（第三期）牙本质中不含牙本质小管。牙本质小管内含有成牙本质细胞突起，这些突起似乎延伸至釉牙本质界，但由于标本制备过程中的医源性损失，在规则的继发性牙本质中很少发现成牙本质细胞。在原发性牙本质中，牙本质小管被大量的管周牙本质包围，管周牙本质的直径从釉牙本质界向原发性和继发性牙本质交界处增加。管周牙本质内牙本质小管的位置在不同的牙本质部位有所不同。管周牙本质仅存在于原发性牙本质中，并被一层薄薄的管间牙本质包围。酸蚀后，管周牙本质使原发性和继发性牙本质交界处附近的牙本质呈现蜂窝状外观。
