5种手持根管器械预备弯曲人工根管的效果Ⅱ.成形能力比较

Effect on preparing curved artificial root canal with five handle endodontic instruments.Ⅱ comparison of shaping ability

目的比较5种手持根管器械的成形能力。方法用光学显微镜观察5种手持根管器械常规法预备弯曲人工根管后的根管形态变化。结果所有标本未发现根尖拉开、肘部形成和穿孔。K－Flex组有75％的标本出现台阶，台阶的出现与根尖部树脂屑栓的形成有很密切的关系。K－Flex组和H挫组的根尖偏移较大，与K针组比较，有显著性差异（PMO．05），其余各组之；b］无显著性差异（P＞0．05）。结论通过综合评价5种手持根管器械预备弯曲人工根管的切削能力和成形能力，作者认为Unifile和K型挫是首选的器械。

Objective To compared the shaping ability of five handle endodonticintruments. Methods The canal shape of prepared artificial root canals with five handleendodontic instruments were observed by light-microscope. Results Apical zips, elbows andperforations were not found. Ledges occurred in specimens of K-Flex group and they wererelating to resinous plugs. The apical transportations were relating to resinous plugs. Theapical transportations of K--Flex group and H file group are much greater than other groups.Conclusion Unifile or K file is first choice to prepare curved artificial root canals with routinepreparation technique by comprehensive evalution of the cutting ability and shaping ability offive handle endodontic instruments.[