Shen Ya, Cheung Gary Shun-pan, Bian Zhuan, Peng Bin
Department of Operative Dentistry and Endodontics, School of Stomatology, Wuhan University, Luoyu Road, Wuhan City, P.R.China 430079.
J Endod. 2006 Jan;32(1):61-5. doi: 10.1016/j.joen.2005.10.017.
The purpose of this study was to compare the incidence and mode of instrument separation of the two nickel-titanium (NiTi) rotary systems that were used according to a predefined schedule of clinical use by the same group of operators. A total of 166 ProFile and 325 ProTaper instruments, discarded from this endodontic clinic over 17 months, was analyzed. The incidences of instrument separation were 7% for ProFile and 14% for ProTaper (p < 0.05). The proportion of unwinding defects was 5% in ProFile and 0.3% in ProTaper instruments (p < 0.01). Flexural fatigue was implicated in the majority of separations in both groups. The results of this study indicated that while ProTaper was more likely to separate without warning, ProFile tended to exhibit unwinding of flutes more frequently.
本研究的目的是比较同一组操作人员按照预先确定的临床使用计划使用的两种镍钛（NiTi）旋转系统器械分离的发生率和模式。对该牙髓病诊所17个月内丢弃的总共166支Profile器械和325支ProTaper器械进行了分析。Profile器械分离的发生率为7%，ProTaper器械为14%（p<0.05）。Profile器械中展开缺陷的比例为5%，ProTaper器械中为0.3%（p<0.01）。两组中大多数分离都与弯曲疲劳有关。本研究结果表明，虽然ProTaper更有可能在无预警的情况下分离，但Profile器械的凹槽展开更为频繁。
