Yang Guo-bin, Zheng Yu-lu, Xu Wei-qun, Li Hao-lai, Wu Hong-kun
Key. Laboratory of Oral Biomedical Engineering of Ministry of Education, Sichuan University, Chengdu 610041, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2007 Aug;25(4):386-9.
To compare the shaping ability of rotary ProTaper and Flexofile in simulated resin root canals.
Forty simulated resin root canals were randomly assigned to two groups, one group for rotary ProTaper with crown-down technique and the other for Flexofile with balanced force technique. Change of working length and incidence of canal aberration and instruments failure were recorded. After preparation, the change of root canal curvature and the amount of resin removed at the inner and outer canal walls were measured with Image Pro Plus 5.0. The centring ability and total amount of resin removed were also assessed.
In the model of simulated resin canals, ProTaper instruments maintained working length better. Canals prepared with ProTaper instruments remained better curvature and showed fewer aberration compared with those prepared with Flexofile (P < 0.01). ProTaper instruments performed a better centring ability.
ProTaper instruments have a better shaping ability in simulated resin root canals.
比较旋转ProTaper锉和Flexofile锉在模拟树脂根管中的塑形能力。
将40个模拟树脂根管随机分为两组，一组采用冠向深入技术使用旋转ProTaper锉，另一组采用平衡力技术使用Flexofile锉。记录工作长度的变化、根管偏移发生率及器械折断情况。预备后，使用Image Pro Plus 5.0测量根管弯曲度的变化以及根管内壁和外壁去除的树脂量。同时评估定心能力和去除树脂的总量。
在模拟树脂根管模型中，ProTaper器械能更好地保持工作长度。与使用Flexofile锉预备的根管相比，使用ProTaper器械预备的根管保持了更好的弯曲度且偏移较少（P < 0.01）。ProTaper器械具有更好的定心能力。
在模拟树脂根管中，ProTaper器械具有更好的塑形能力。
