适当或往复最佳扭矩逆向运动学对四根单根管循环疲劳的影响。
Influence of proper or reciprocating optimum torque reverse kinematics on cyclic fatigue of four single files.
作者信息
Pedullà Eugenio, Ambu Emanuele, Rovai Fabio, Chang Seok-Woo, Campedelli Federico, Corsentino Giacomo, Rapisarda Silvia, La Rosa Giusy R M, Grandini Simone
机构信息
Department of General Surgery and Surgical-Medical Specialties, University of Catania, Catania, Italy.
Department of Endodontics and Restorative Dentistry, University of Siena, Siena, Italy.
出版信息
J Investig Clin Dent. 2019 Aug;10(3):e12409. doi: 10.1111/jicd.12409. Epub 2019 Mar 7.
AIM
The aim of the present study was to evaluate the resistance to cyclic fatigue of heat-treated single files used in proper or in reciprocating optimum torque reverse motions.
METHODS
Ninety-six HyFlex electrical discharge machining (EDM), Reciproc R25 (Rec), WaveOne Primary (WO), and WaveOne Gold (WOG) Primary were used. Resistance to cyclic fatigue was determined by recording time to fracture in a stainless steel artificial canal. Differential scanning calorimetric analysis was performed. Data were analyzed by two-way analysis of variance and Bonferroni post-hoc tests at 0.05.
RESULTS
In both movements, HyFlex EDM showed higher time to fracture than other files (P < 0.0001). Rec showed higher time to fracture than WO (P < 0.0001), while WOG showed higher cyclic fatigue resistance than Rec and WO with both movements (P < 0.005).
CONCLUSIONS
Reciprocating optimum torque reverse motion improved significantly cyclic fatigue resistance of gold and controlled memory wire single files.
目的
本研究旨在评估经过热处理的单根管锉在正向或往复式最佳扭矩反向运动中对循环疲劳的抵抗力。
方法
使用了96根HyFlex电火花加工（EDM）根管锉、Reciproc R25（Rec）根管锉、WaveOne Primary（WO）根管锉和WaveOne Gold（WOG）Primary根管锉。通过记录在不锈钢人工根管中折断的时间来确定对循环疲劳的抵抗力。进行了差示扫描量热分析。数据采用双向方差分析和Bonferroni事后检验进行分析，检验水准为0.05。
结果
在两种运动方式下，HyFlex EDM根管锉的折断时间均长于其他根管锉（P < 0.0001）。Rec根管锉的折断时间长于WO根管锉（P < 0.0001），而在两种运动方式下，WOG根管锉的抗循环疲劳能力均强于Rec和WO根管锉（P < 0.005）。
结论
往复式最佳扭矩反向运动显著提高了金色和可控记忆合金单根管锉的抗循环疲劳能力。
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