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.

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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.

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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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