2种机用镍钛器械磨牙根管预备效果的临床观察

［摘要］ 目的比较2种机用镍钛器械Reciproc和Mtwo用于磨牙根管预备的效果。方法 选取因牙髓炎或根尖周炎需治疗的磨牙62例，随机分成R、M两组,其中R组32例，选用Reciproca进行根管预备，M组30例，选用Mtwo进行根管预备，采用热牙胶垂直加压充填技术进行充填。评价器械损耗、预备时间、预备效果。 结果 Reciproc无折断，Mtwo折断2支。预备时间：R组(15.45±3.16）min，M组(20.31±2.32) min，差异有统计学意义（P＜0.05)。两组均未发生根管偏移，无根尖阻塞、台阶及侧壁穿孔等并发症。 结论 两种机用镍钛器械Reciproc和Mtwo用于磨牙根管预备，均能达到良好的效果，但Mtwo时间略长，并且要预防器械折断。

Clinical effects evaluation of two types of rotary NiTi instruments in molar root canal preparation.

Abstract：　Objective　 To compare the effects of molar root canal preparation using two kinds of rotary NiTi instrumrnts. Reciproc and Mtwo instruments. Methods　 A total of 62 patients were enrolled in this study. The patients' molars needed root canal treatment because of pulpitis or periapital periodontitis. And the patients were randomly divided into Group R[Reciproc group(32 cases)]and Group M[ Mtwo group(30 cases)].The above two groups were filled with warm qutta-percha vertical condensation technique. The fractured files and the operating time were recorded. The shaping abilities of two types of NiTi files were analyzed. Results No Reciproc was separated, whereas two pieces of Mtwo were separated. The preparation time of Group R averaged (15.45±3.16) minutes, and Group M averaged (20.31±2.32) minutes, and the difference was statistically significant(P<0.05)．No transportatio，apical blockage,ledge or perforation was found in the two groups. Conclusion Two types of NiTi instruments also show high performance when they are used to molar root canal preparation,but Mtwo instruments need more time and we should pay attention to prevent the fracture of it．