可变锥度镍钛锉在树脂弯曲根管中成形效果的观察

目的 比较不锈钢K型锉与可变锥度ProTaper镍钛锉在仿制树脂弯曲根管中的成形效果。方法 将30个仿制树脂根管随机分为3组，分别使用不锈钢K型锉、手用ProTaper锉、机用ProTaper锉预备，记录预备后根管全长内外侧树脂去除量、预备后根管宽度、根管弯曲度变化、根管偏移。结果 与不锈钢K型锉相比，手用和机用Pro Taper锉预备后的根管在根尖外侧和弯曲起始部内侧的树脂去除量较少（P＜0.05），根管直化度较小（P＜0.05），无明显根管偏移。结论 ProTaper锉成形效果优于不锈钢K型锉，预备后能形成一个与原形相似、流畅的锥形根管。

Shaping Ability of Multi-taper Nickel-titanium Files in Simulated Resin Curved Root Canal

Objective To compare the shaping ability of ISO standard stainless steel K files and multi-taper ProTaper nickel-titanium files in simulated resin curved root canals.Methods Thirty simulated resin root canals were randomly divided into three groups and prepared by stainless steel K files,hand ProTaper,rotary ProTaper,respectively.The amount of material removed from inner and outer wall and canal width after canal preparation was measured,while the canal curvature before and after canal preparation and canals aberrations were recorded. Results The stainless steel K files removed more material than hand ProTaper and rotary ProTaper at the outer side of apex and inner side of curvature(P<0.05).The mean degree of straightening in stainless steel K files group was significantly bigger than in ProTaper group(P<0.05).The canals prepared by ProTaper had no evident aberration. Conclusion The shaping ability of ProTaper is better than stainless steel K files.