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该研究的目的是:①将测量根管弯曲度的传统方法(Schneider technique.ST)与新的长轴测量方法(long-axis technique,LAT)加以比较。②评价CM器械在人离体下颌磨牙弯曲根管中的作用,并与后退法(step-back, SB)、平衡力(balanced-force, BF)预备根管等方法进行比较。 材料和方法 选择人离体下颌第一、二磨牙53颗,75个近中根管,弯曲度均≥15°(ST)。全部根管按弯曲度排列,然后再顺序分为3组。第一组(CM组)用
The purpose of this study was to: (1) Compare the traditional method of measuring root canal curvature (Schneider technique. ST) with the new long-axis technique (LAT). ② To evaluate the effect of CM instrument on the curved root canal of human mandibular molars, and to compare with the method of step-back (SB) and balanced-force (BF) preparation of root canal. MATERIALS AND METHODS: Human mandibular first and second molars 53 and 75 proximal mid-canal were selected. The curvature was ≥15 ° (ST). All root canal arranged by curvature, and then divided into 3 groups. The first group (CM group) use