【摘要】 目的:比较3种机用镍钛器械预备弯曲根管产生的根向力。方法:选择30颗离体单根管的下颌前磨牙,弯曲度10°～20°,随机分成3组,分别以ProTape Next(PTN)、ProTaper Universal(PTU)、M3器械预备根管,测量并比较预备根管产生的根向压力和时间。结果:PTN组的压力峰值显著小于其他两组(P<0.05),PTU组和M3组比较差异无统计学意义。结论:PTN组镍钛器械预备弯曲根管产生的根向压力较小,安全性更高。更多还原

【Abstract】 Objective: To compare the apically vertical load induced by three NiTi instruments during canal shaping of extracted teeth. Methods: Thirty extracted mandibular premolar teeth which had single canal with a curvature between 10-20 degree were shaped with ProTape Next(PTN; Dentsply Maillefer, Switzerland), ProTaper Universal(PTU,Dentsply Maillefer, Switzerland), and M3(China) systems(n=10 for each system). During root canal shaping, time and apically vertical load were recorded. Results: PTN group had the lowest apically vertical load, while PTU group and M3 group had no significant difference. Conclusion: ProTaper next NiTi instrument system(PTN) had the lowest values of apically vertical load while shaping, which may attributed to its safety.更多还原