本实验旨在报告感染根管的狗无髓牙的根尖周组织在根尖切除术和不同水平的根管充填后的组织学表现以评定暴露牙本质对愈合过程的影响。 作者将60只狗牙根管开放,去髓,经30天造成感染后,行根管清理、冲洗,均分为3组:1组行根尖切除术后,根管口用丁氧膏加银汞合金密封(未填组);2组根尖切除后,采用丁氧膏加牙胶行根管欠填2 mm(欠填组);3组同2组,但适填到根尖部(适填组)。180天后处 The purpose of this study was to report the histological findings of root apical periapical tissues of non-myelinated teeth infected with root canal after root apical resection and different levels of root canal filling to evaluate the effect of exposed dentin on the healing process. After the root canal was cleared and rinsed, the dogs were divided into three groups: Group 1 was treated with appendectomy Silver-amalgam sealed (not filled group); 2 groups of apical resection, the use of butoxybutadiene plus gum root canal filling less than 2 mm (underfill group); 3 groups with 2 groups, but appropriate to fill the root tip (Suitable for group). 180 days later