Defects in rotary nickel-titanium files after clinical use
Defects in rotary nickel-titanium files after clinical use
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DOI：
10.1097/00004770-200003000-00008
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发表时间：
2000-03-01
影响因子：
4.2
通讯作者：
Messer, HH
中科院分区：
文献类型：
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作者：
Sattapan, B;Nervo, GJ;Messer, HH
本研究的目的是分析镍钛旋转根管锉在临床常规使用、酸洗后的缺陷类型和频率，以得出失败原因的结论。对专家牙髓病诊所正常使用超过 6 个月后丢弃的所有文件（总计：378 个，Quantec Series 2000）进行了分析。近 50% 的文件显示出一些明显的缺陷； 21% 发生骨折，28% 有其他缺陷但未发生骨折。根据观察到的缺陷特征，断裂锉刀可分为两组。所有断裂锉刀中，55.7% 发生扭转断裂，而 44.3% 发生弯曲疲劳。结果表明，扭转失效（可能是由于在器械安装过程中使用过多的根尖力引起的）比弯曲疲劳（可能是在弯曲根管中使用引起的）更频繁地发生。
The purpose of this study was to analyze the type and frequency of defects in nickel-titanium rotary endodontic files after routine clinical use, acid to draw conclusions regarding the reasons for failure. All of the files (total: 378, Quantec Series 2000) discarded after normal use from a specialist endodontic practice over 6 months were analyzed. Almost 50% of the files showed some visible defect; 21% were fractured and 28% showed other defects without fracture. Fractured files could be divided into two groups according to the characteristics of the defects observed. Torsional fracture occurred in 55.7% of all fractured files, whereas flexural fatigue occurred in 44.3%. The results indicated that torsional failure, which may be caused by using too much apical force during instrumentation, occurred more frequently than flexural fatigue, which may result from use in curved canals.