ProTaper镍钛系统去除根管内充填物的效果评价

摘要

The canals of 30 extracted mandibular second premolars were prepared with ProTaper Universal rotary instruments to F3 and then divided into two groups. The canals in group A were filled lateral compaction technique and those in group B by warm vertical compaction technique respectively. In each group,ProTaper Universal rotary retreatment systems( Dl ,D2,D3) and ProTaper Universal systems (F2,F3, F4 ) were used to remove the filling material. The percentage of residual filling material was measured and the operating time was recorded. In group B, the percentage of residual filling material was significantly lower than that in group A, but the operating time was longer. The residual filling material in both group mainly lied in apical third of root canal. The cleaning efficacy of ProTaper Ni-ti instruments in group B was higher than in group A.%比较ProTaper镍钛系统去除不同充填方法的根管内充填物的效果.A组:侧方加压法充填;B组:热牙胶垂直加压法充填.2组均采用ProTaper Universal再治疗器械(D1,D2,D3)+ProTaper Universal(F2,F3,F4)去牙胶及根管再预备,测量镍钛器械操作时间及根管内充填物的残留量.B组根管壁充填物残留量低于A组,镍钛器械所需时间高于A组.2组中牙胶残留物均主要位于根尖三分之一区域.ProTaper镍钛系统去除垂直加压法充填的牙胶管壁清洁度较高.