镍钛旋转器械在弯曲根管中临床使用后疲劳抗力的降低。
Decrease in the fatigue resistance of nickel-titanium rotary instruments after clinical use in curved root canals.
作者信息
Bahia Maria Guiomar A, Buono Vicente Tadeu Lopes
机构信息
Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.
出版信息
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2005 Aug;100(2):249-55. doi: 10.1016/j.tripleo.2004.10.013.
OBJECTIVE
The changes in fatigue resistance of nickel-titanium rotary ProFile instruments after clinical use for shaping 10 curved molar root canals were evaluated in this study.
STUDY DESIGN
Twenty-five sets of files #20, #25, and #30 and tapers .04 and .06 were divided into 2 groups, one with 10 sets of new files that were tested in a fatigue test bench device as a control. The other, experimental group, with 15 sets of clinically used files, was tested in the same device. The Student t test was employed to compare mean values of the measured parameters.
RESULTS
A statistically significant decrease in the number of cycles to failure was determined for the clinically used files, as compared with the new ones. The fracture point was the same for all files tested.
CONCLUSIONS
The clinical use of ProFile instruments for shaping curved canals reduces their fatigue resistance.
目的
本研究评估了镍钛旋转ProFile器械在临床用于预备10个弯曲磨牙根管后抗疲劳性能的变化。
研究设计
将25套20号、25号和30号锉，锥度为0.04和0.06的锉分为两组，一组为10套新锉，在疲劳试验台上进行测试作为对照。另一组为实验组，有15套临床使用过的锉，在同一设备上进行测试。采用Student t检验比较测量参数的平均值。
结果
与新锉相比，临床使用过的锉在失效循环次数上有统计学意义的显著降低。所有测试锉的断裂点相同。
结论
ProFile器械临床用于预备弯曲根管会降低其抗疲劳性能。
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