即刻桩腔预备对三种根管预备方法预备的直根管根尖封闭性的影响

目的 研究三种不同根管预备方法根管预备、根管充填后即刺桩腔预备对直根管根尖封闭性的影响.方法 离体直单根管上前牙124个,其中120个随机平均分为3组(n=40),A组:不锈钢根管锉常规法;B组:G 型钻根管冠部预处理 不锈钢根管锉常规法;C组:手用Pr01raper镍钛根管锉冠向下法,刺余4个随机平均分为阴性对照组和阳性对照组.所有根管均用侧方加压法充填,即刻手持垂直加压器去除部分充填材料,然后P型钻桩腔预备.用染料渗透法评价各组根尖封闭能力.结果 B组G型钻根管冠部预处理 不锈钢根管锉常规法预备的根管和C组手用ProTaper镍钛根管锉冠向下法预备的根管即刻桩腔预备后,其根尖微渗漏较A组常规法预备的轻(P<0.05).结论 大锥度根管预备,根管充填后即刻桩腔预备的根尖封闭性较好.

Effect of immediate post space preparation after three different root canal preparation technique on apical sealing ability in slraight root canals

Objective To investigate the effect of immediate post space preparation after root canal obturation with different root canal preparation technique on apical sealing ability in straight root canals.Methods One hundred and twenty four upper anterior teeth with straight root canals were collected, 120 teeth were randomly assigned to 3 groups (n=40). Group A: stainless steel file conventional root canal preparation technique; group B: Gate-Glidden drill coronal preflaring plus stainless steel file conventional root canal preparation technique; group C: ProTaper for hand crown-down technique. The remained four teeth were equally divided into negative control group and positive control group. All the prepared canals were obturated with cold lateral condensation. A portion of the root canal filling material was removed with vertical plugger, and post space was prepared with Peeso reamer. Dye penetration was used to evaluate the apical sealing ability of different groups.Results The apical microleakage of group B and C was less than that of group A(P<0.05).Conclusion The apical sealing ability of immediate post space preparation after root canal obturation with large taper root canal preparation was better than conventional root canal preparation.