目的分析不同根管弯曲度测量法的几何原理。
AIM: To analyse the geometric principles of different measurements of root canal curvature.
结论：根管治疗的失败与牙位(牙类型和牙位置)、根管弯曲度和钙化度密切相关。
CONCLUSION: the tooth type or tooth position, root curvature and calcification have significantly influenced the outcome of root canal treatment.
分别预备到主尖锉30号和40号，对各组器械预备前后的根管弯曲度和预备时间进行测量。
Root canal preparation was carried out at two stages: first to size 30, then to size 40. The root canal curvatures before and after preparation as well as preparation time were measured.
分别预备到主尖锉30号和40号，对各组器械预备前后的根管弯曲度和预备时间进行测量。
Root canal preparation was carried out at two stages: first to size 30, then to size 40. The root canal curvatures before and after preparation as well as preparation time were measured.
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