Lumley P J, Walmsley A D, Walton R E, Rippin J W
Department of Restorative Dentistry, The Dental School, Birmingham, United Kingdom.
J Endod. 1993 Sep;19(9):453-7. doi: 10.1016/S0099-2399(06)80532-7.
This study investigated the effect of direction of file oscillation on the amount of debris and smear remaining within oval canals. Sixty-five lower premolars were allocated to six experimental groups (n = 10) and one control group (n = 5). Canals were prepared using Gates Glidden burs and hand instruments. Preparations were completed using either an ultrasonic size 15 K file or a sonic size 15 shaper file. Three preparation techniques were used: (a) file oscillation toward oval recesses within the canal, (b) file oscillation at right angles to the recesses, and (c) rotational movement of handpiece. Canals were examined under the scanning electron microscope and blindly scored for debris and smear layer. Log linear analysis revealed no significant difference (p > 0.05) between sonic or ultrasonic instrumentation as to debris or smear layer remaining. File oscillation directed toward oval recesses left the least amount of debris (p < 0.05). Smear layer remained unaffected by all techniques.
本研究调查了锉针振荡方向对椭圆形根管内残留碎屑和玷污层数量的影响。65颗下颌前磨牙被分配到6个实验组（n = 10）和1个对照组（n = 5）。使用盖茨-格利登钻和手动器械预备根管。预备完成时使用超声15号K锉或声波15号成形锉。采用了三种预备技术：（a）锉针朝着根管内的椭圆形凹陷振荡，（b）锉针与凹陷呈直角振荡，以及（c）手机的旋转运动。在扫描电子显微镜下检查根管，并对碎屑和玷污层进行盲法评分。对数线性分析显示，声波或超声器械在残留碎屑或玷污层方面无显著差异（p > 0.05）。朝着椭圆形凹陷的锉针振荡残留的碎屑量最少（p < 0.05）。所有技术对玷污层均无影响。
