离体牙塑化后根管再通的探讨

目的探讨不同器械去除根管内塑化物的效果及其影响因素。方法89颗离体牙的197个根管塑化后，分别用声波、超声和手动器械掏取根管内塑化物，于立体显微镜下观察未通根管的纵剖面。结果振动器械扩通率显著高于手用器械：胶状塑化根管的扩通率为76．0％～84．0％，粗根管为90．0％-100．0％，轻度弯曲根管为93．8％-100．0％；细弯、硬塑化根管的扩通率均较低（0～20％）。63％未通根管发生操作缺陷，多位于根管的弯曲拐点处。结论振动器械有助于胶状塑化物的去除。

An in vitro study of intraradicular resinifying material removal

OBJECTIVE: To investigate the associated factors that influence the removal of intraradicular resinifying material. METHODS: One hundred and ninety-seven root canals were treated with resinifying therapy, then the canals were negotiated with sonic, ultrasonic and hand instrument. Those failed to be negotiated were splinted longitudinally and observed with ZOOM-630E stereomicroscope. RESULTS: Sonic and ultrasonic instrument negotiated more canals, especially those with jelly-like resinifying material (76.0% approximately 84.0%) and of smaller curvature (90.0% approximately 100.0%) or larger initial apical file (IAF) size (93.8% approximately 100.0%). Those with hard resinifying material and of bigger curvature or smaller IAF size were hard to be negotiated no matter which kind of instrument was used (0 approximately 20%). CONCLUSIONS: Vibratory instrument can effectively removal intraradicular resinifying material.