Cyclic fatigue of EndoSequence and K3 rotary files in a dynamic model
Cyclic fatigue of EndoSequence and K3 rotary files in a dynamic model
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DOI：
10.1016/j.joen.2007.07.041
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发表时间：
2007-12-01
影响因子：
4.2
通讯作者：
Rutledge, Richard E.
中科院分区：
文献类型：
--
作者：
Ray, Jarom J.;Kirkpatrick, Timothy C.;Rutledge, Richard E.
通过相对于高度抛光表面（与水平方向倾斜15度）旋转锉，比较K3和EndoSequence锉的抗循环疲劳性。对于每个品牌，在300和600 rpm下测试了0.04和0.06锥度的25尖端锉刀和0.04和0.06锥度的40尖端锉刀。3 mm轴向运动模拟了每秒1个周期的临床啄食运动。使用方差分析和独立Student t检验计算和分析失效旋转次数，通过Bonferroni校正的非参数Mann-Whitney U检验确认结果。在300和600 rpm下，K3锉的断裂循环次数在统计学上显著多于具有相同头端尺寸和锥度的EndoSequence对应器械。扫描电子显微镜图像表明表面特征与循环疲劳断裂一致。在这个模型中，文件设计似乎是最重要的决定因素的循环疲劳抗力。
The cyclic fatigue resistance of K3 and EndoSequence files was compared by rotating files against a highly polished surface inclined at 15 degrees to the horizontal. For each brand, files with a 25 tip in .04 and .06 taper and files with a 40 tip in .04 and .06 taper were tested at both 300 and 600 rpm. A 3-mm axial movement simulated a clinical pecking motion at 1 cycle per second. The number of rotations to failure was calculated and analyzed by using analysis of variance and Independent Student's t tests, with results confirmed by nonparametric Mann-Whitney U tests with a Bonferroni correction. At both 300 and 600 rpm, K3 files exhibited statistically significantly more cycles to fracture than their EndoSequence counterparts with the same tip size and taper. Scanning electron microscopy images demonstrated surface features consistent with fracture due to cyclic fatigue. In this model, file design appeared to be the most important determinant of cyclic fatigue resistance.