【摘要】 目的观察牙根裂的组织病理改变，以探讨牙根裂的病因。方法常规组织学方法，光镜下观察，以除外牙根裂的残根作为对照。结果２２个患根中２０个为扁根，其中１４个牙根含２个扁根管。横断切片上主裂隙多沿牙本质生长线发生（１４个牙根）。纵向切片上主裂隙侧壁在根尖１／３有明显的牙本质吸收。主裂隙中存在修复现象。结论含２个根管的扁牙根形态较多发生牙根裂。牙本质中的生长线是牙根组织结构上的弱点。牙根裂的修复和愈合不是不可能的。更多还原

【Abstract】 Objective To analyze the causes of root fractures by examining fractured roots histologically.Methods Fractured roots were sectioned for microscopic analysis in conventional histological ways.Results ①Among 18 roots cut transversely were 14 flat roots with 2 canals, ②most of the fractures passed along incremental line in dentine, ③ of the longitudinally sectioned roots, areas of marked resorption were visible on the dentine within the fractures of apical third, and ④ repairs of both soft and hard tissues were observed in the fracture spaces.Conclusion The fractures of roots were associated with morphology of roots and incremental lines in dentine. The repair and cure of fractured roots were not impossible.更多还原