CAJ | 학술논문

目的：比较机用镍钛Protaper、K3、iRaCe在重度弯曲根管预备中的根管成形能力。方法：收集新鲜拔除的人恒磨牙60颗，要求其中一个根管的弯曲角度为25°～45°，分为Protaper组、K3组和iRaCe组，每组20颗。每颗牙分别在根管预备前后拍摄标准化的平行投照片，通过影像分析来记录根管弯曲度的变化值和根尖偏移量，同时记录折断的器械和根管预备的时间。结果：实验过程中3个组均无器械折断。 K3组、iRaCe组在根管预备后根管弯曲角度的变化小于Protaper组，差异有统计学意义（P＜0．05），K3组和iRaCe组之间差异也具有统计学意义（P＜0．05）。Protaper组、K3组的根尖偏移量大于iRaCe组，差异有统计学意义（P＜0．05），Protaper组和K3组之间差异无统计学意义（P ＞0．05）。三组在操作时间上的差异无统计学意义（P＞0．05）。结论：iRaCe和K3在重度弯曲根管预备中的根管成形能力较Protaper要好，更适合用于重度弯曲根管预备。
목적：비교궤용얼태Protaper、K3、iRaCe재중도만곡근관예비중적근관성형능력。방법：수집신선발제적인항마아60과，요구기중일개근관적만곡각도위25°～45°，분위Protaper조、K3조화iRaCe조，매조20과。매과아분별재근관예비전후박섭표준화적평행투조편，통과영상분석래기록근관만곡도적변화치화근첨편이량，동시기록절단적기계화근관예비적시간。결과：실험과정중3개조균무기계절단。 K3조、iRaCe조재근관예비후근관만곡각도적변화소우Protaper조，차이유통계학의의（P＜0．05），K3조화iRaCe조지간차이야구유통계학의의（P＜0．05）。Protaper조、K3조적근첨편이량대우iRaCe조，차이유통계학의의（P＜0．05），Protaper조화K3조지간차이무통계학의의（P ＞0．05）。삼조재조작시간상적차이무통계학의의（P＞0．05）。결론：iRaCe화K3재중도만곡근관예비중적근관성형능력교Protaper요호，경괄합용우중도만곡근관예비。
Objective:To compare the shaping ability of Protaper,K3 and iRaCe NiTi files during the preparation of severely curved root canals in extracted human molar teeth. Method:Sixty human molars with anyone canals having angles of curvature ranging from 25° to 45° were divided according to the instrument used into three groups of 20 teeth each:group Protaper,group K3 and group iRaCe. Using standardized pre- and post-instrumentation radiographs,straightening of canal curvature and apical transportation were determined using image analysis software. Result:During root canal prepara-tion,no instruments fractured. The use of Protaper resulted in significantly greater canal straightening than K3 and iRaCe(P<0.05),there were also significant differences between K3 and iRaCe(P <0.05). There were significant differences between Protaper,K3 and iRaCe with respect to apical transportation (P <0.05),but there were no significant differences between Protaper and K3 (P >0.05). There were no significant differences between three groups in using time (P >0.05). Conclu-sion:iRaCe and K3 were better than Protaper in the shaping ability of severely curved root canals.