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本文目的是评价转速对Ni-Ti锉变形和(或)折断的影响。 材料和方法 按以下标准挑选40颗根尖完全形成的离体磨牙:①龋坏小,②至少有三个根管,③任何一个根弯曲不超过60°,④至少有一根弯曲超过30°。弯曲度依Schneider法测定评估。牙齿分成两组,每组包括10颗上磨牙和10颗下颌磨牙,A组平均弯曲度是37.076°,B组是36.887°。本研究使用了50套04锥度机用Ni-Ti器械,每套包括1~#～3~#根管口成形器、4~# ～8~#锉,每套器械仅预备一颗牙。
The purpose of this paper is to evaluate the effect of rotational speed on the deformation and / or fracture of a Ni-Ti file. MATERIALS AND METHODS: Forty isolated root canals were selected according to the following criteria: ① small caries, ② at least three root canals, ③ any one root bent less than 60 °, ④ at least one bent more than 30 °. The degree of curvature is evaluated by the Schneider method. The teeth were divided into two groups, each consisting of 10 maxillary molars and 10 mandibular molars. The average curvature of group A was 37.076 ° and that of group B was 36.887 °. This study used 50 sets of 04 taper machine Ni-Ti equipment, each including 1 ~ # ~ 3 ~ # root canal forming device, 4 ~ # ~ 8 ~ # file, each device is only prepared a tooth.