[两种镍钛旋转系统根管预备后根尖根裂发生率的比较：一项体外研究]
[Comparison of the incidences of apical root cracks after canal preparation with two nickel-titanium rotary systems: an in vitro study].
作者信息
Chen Chen, Liang Yu-hong, Gao Xue-jun
机构信息
Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
出版信息
Beijing Da Xue Xue Bao Yi Xue Ban. 2015 Feb 18;47(1):129-33.
OBJECTIVE
To compare the incidences of root cracks after canal instrumentation with HyFlex CM system and the ProTaper Universal system.
METHODS
Sixty mandibular incisors were mounted in resin blocks with simulated periodontal ligaments, and the apex was exposed. The control group of 20 teeth was not prepared, and the other 40 teeth were divided into 2 experimental groups (n=20). The 40 root canals of the experimental groups were instrumented using HyFlex CM and ProTaper Universal to the major apical foramen (AF). The horizontal sections 1 mm, 2 mm, and 3 mm from the apex were observed under an optical stereomicroscope at 25×magnification. The presence of cracks was noted.
RESULTS
No cracks were found in the control teeth. Cracks were found in 1 of 20 (5%) teeth in HyFlex CM group, and 17 of 20 (85%) teeth in ProTaper Universal group. The difference between the two experimental groups was statistically significant (P<0.01).
CONCLUSION
The HyFlex CM files caused fewer root cracks than the ProTaper Universal files during the root canal instrumentation.
目的
比较使用HyFlex CM系统和ProTaper Universal系统进行根管预备后牙根裂纹的发生率。
方法
将60颗下颌切牙固定于带有模拟牙周膜的树脂块中，暴露根尖。20颗牙作为对照组不进行预备，另外40颗牙分为2个试验组（每组n = 20）。试验组的40个根管分别使用HyFlex CM和ProTaper Universal系统预备至根尖孔。在25倍放大率的光学体视显微镜下观察根尖上方1 mm、2 mm和3 mm处的水平切片，记录裂纹的存在情况。
结果
对照组牙齿未发现裂纹。HyFlex CM组20颗牙中有1颗（5%）出现裂纹，ProTaper Universal组20颗牙中有17颗（85%）出现裂纹。两组试验组之间的差异具有统计学意义（P < 0.01）。
结论
在根管预备过程中，HyFlex CM锉导致的牙根裂纹比ProTaper Universal锉少。
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