取断针失败后根管充填方法的选择和评价

Research of choose the methods and drugs in the root canal with separate instrument which failed to be taken out

目的探讨取断针失败后的根管的充填方法。方法制备80颗根尖含根管断针的离体牙模型,实验组对照组各半。实验组(预备组)预备根管,制备断针取出失败时的根管模型;对照组(非预备组)将断针模型不经预备直接进行根管充填,两组都用塑化液和牙胶根充糊剂进行根管充填,使用透明牙法观察对断针的封闭效果。结果①非预备组中塑化封闭根尖效果优于糊剂牙胶充填效果(P<0.05)②预备组塑化治疗与糊剂牙胶根尖封闭效果无明显差异(P>0.05)。结论临床上断针且取出失败时,宜选择牙胶和根充糊剂充填根管。

Objective To study and evaluate the methods and drugs in the root canal with broken instrument which failed to be take out. Methods 80 root canal models with fractured instrument were divide into two groups. In test group, 40 canal models were prepared to imitate the shape of those canals which have broken instrument and have been prepared in order to take then out. In contrast group, 40 canal models were regular prepared. Each group were divided into two teams and filled by resinifying therapy and root canal filling with zinc oxide paste （ZOE） gutta-percha point. Results In contrast group, the sealed ability of resinifying therapy was better than ZOE and gutta-percha point （P〈0.05）. In test group, no significant difference was found between resinifying therapy and root canal filling （P〉0.05）.Conclusions Root canal filling by ZOE and gutta-percha point is a feasible and effective method in treating the canal with fractured instrument which failed to be take out.