交替旋转与连续旋转：对器械寿命影响的比较研究。
Alternating versus continuous rotation: a comparative study of the effect on instrument life.
机构信息
Department of Operative Dentistry and Endodontics, School of Dentistry, University of Santiago de Compostela, Santiago de Compostela, Spain.
出版信息
J Endod. 2010 Jan;36(1):157-9. doi: 10.1016/j.joen.2009.09.023.
INTRODUCTION
Rotary nickel-titanium instruments have multiple advantages but with the risk of more fractures because of flexure or torsion. Alternating rotation appears to be an alternative to continuous rotary movement. The objective of this study was to determine the influence of the type of instrument rotation on the frequency of fractures or deformation.
METHODS
Instrumentation was performed on 120 molar root canals with an angle of curvature greater than 30 degrees using alternating rotation (group A: 60 degrees clockwise, 45 degrees counterclockwise) and continuous rotation (group B).
RESULTS
The results indicate that instruments used with alternating rotation have a higher mean number of uses (13.0) compared with the continuous rotation group (10.05); this difference was statistically significant (p < 0.05).
CONCLUSIONS
The ProTaper shaping instruments (S1 and S2) are those that achieved the greatest difference in use with alternating rotation, with S2 being the most resistant to fracture or deformation with the two types of movement used.
简介
旋转镍钛器械具有多种优势，但由于弯曲或扭转，其发生断裂的风险更高。交替旋转似乎是连续旋转运动的替代方法。本研究的目的是确定器械旋转类型对断裂或变形频率的影响。
方法
使用交替旋转（组 A：顺时针 60 度，逆时针 45 度）和连续旋转（组 B）对 120 个具有大于 30 度曲率角度的磨牙根管进行器械预备。
结果
结果表明，与连续旋转组（10.05）相比，使用交替旋转的器械平均使用次数更高（13.0）；这种差异具有统计学意义（p < 0.05）。
结论
ProTaper 成形器械（S1 和 S2）在使用交替旋转时差异最大，S2 在两种运动方式下最能抵抗断裂或变形。
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