两种镍钛锉清除椭圆形弯曲单根管内充填物的效果评价

The effect evaluation of the curved oval root canal filling clearing by two kinds of nickel titanium files

目的评价两种镍钛器械清除椭圆形弯曲单根管内充填物的效果。方法 75颗椭圆形弯曲单根管下颌前磨牙经Hero642镍钛器械根管预备后用热牙胶垂直加压充填,随机分为3组,分别以机用ProTaper Universal Retreatment(ProTaper UR)镍钛锉、机用Mtwo镍钛锉和手用不锈钢H锉去除根管内充填物,X线片法测量各组根管内颊舌向和近远中向根管充填物的残留量百分比,并记录操作时间。结果 3组根管内均有根管充填物残留。ProTaper UR组和Mtwo组颊舌向(F=7.94,P<0.01)和近远中向(F=26.93,P<0.01)根管充填物残留量百分比、操作时间(F=37.6,P<0.01)均少于H锉组,但ProTaper UR组和Mtwo组间颊舌向(t=0.23,P=0.81)和近远中向(t=0.36,P=0.76)根管充填物残留量百分比和操作时间(t=41.35,P=0.08)的差异均无统计学意义。结论 ProTaper UR镍钛锉和Mtwo镍钛锉对椭圆形弯曲单根管内充填物的清除效果优于不锈钢H锉,且可缩短操作时间,但仍不能完全去除根管充填物。

Objective To evaluate the efficacy of the curved oval root canal filling clearing by two kinds of nickel titanium instruments. Methods 75 mandibular premolars with curved oval root canal were prepared with Heor642 and filled with warm vertical compaction technique. The teeth were randomly divided into three groups： ProTaper Universal Retreatment group（ ProTaper UR）, Mtwo group, and manual Hedstrm files group. The percentage of residual filling material from both buccolingual and mesial-distal direction were respectively calculated by X-ray photographs, and the operating time was recorded. Results None of the groups completely removed the filling materials. Two groups of nickel titanium rotary instruments resulted in a smaller percentage of residual filling material compared with the manual Hedstrm files group from both bucco-lingual and mesial-distal direction, while no significant difference was found between the ProTaper Universal group and Mtwo group. Both of the operating time in the two nickel-titanium groups were less than Hedstrom files group, while no difference was found between the two nickel-titanium groups. Conclusion Both ProTaper UR and Mtwo rotary instruments were effective and efficient in removing filling material, but none of the instruments can completely remove filling material in curved oval root canals.