机用镍钛器械在塑化根管再治疗中的临床应用

目的：观察Hero642机用镍钛根管预备系统在磨牙塑化根管再治疗中的临床应用。方法：选择门诊患者56例牙髓塑化治疗后需进行根管再治疗的患牙56颗,其中,上颌磨牙26颗,下颌磨牙30颗,共168个根管,采用Hero642机用根管预备系统进行根管预备,牙胶尖侧压充填,记录根管疏通成功的患牙数和根管数。结果：56颗患牙中49颗患牙（上颌磨牙24颗,下颌磨牙25颗,共148个根管）的塑化根管再通成功,成功率为87.5%。根管再通成功率为88.1%,上颌磨牙塑化根管再通成功率高于下颌磨牙,差异有统计学意义（P〈0.05）。结论：Hero642机用镍钛根管预备系统可用于临床塑化根管的再治疗。

Root canal therapy of resinified teeth with rotary power-driven Nickel-Titanium rotary instrument

Objective:To evaluate the clinical application of Nickel-Titanium rotary instruments Hero642 to the root canal which underwent previous resinifying therapy.Methods:56 molars that had been treated with resinfying therapy before were selected for root canal therapy.The root canal of all cases were shaped by Nickel-Titanium rotary instruments Hero642,and obturated with lateral condensation technique.The number of teeth and root canal which were negotiated were recorded.Result:49 of 56 teeth and 148 of 168 root canals were negotiated and obturated,with a success rate of 87.5% and 88.1% respectively,the success rate of maxillary molars was higher than the mandibular ones',the difference was significant(P<0.05).Conclusion:Nickel-Titanium rotary instruments Hero642 can be used to treat root canals which underwent previous resinifying therapy.