J Endod:镍钛旋转器械基于入路角度和根管半径的循环疲劳强度

2020-01-24 lishiting MedSci原创

这篇研究的目的是为了评估不同的入路角度和弯曲半径对镍钛旋转器械循环疲劳强度的影响。

这篇研究的目的是为了评估不同的入路角度和弯曲半径对镍钛旋转器械循环疲劳强度的影响。

研究使用2种锉系统(2Shape [TS; MicroMega, Besan?on, France] and HyFlex CM [HCM; Coltène/Whaledent, Allst?tten, Switzerland])。在16-mm长、弯曲角度为60°的不锈钢人造根管内评估192只器械TS #25/.04 (TS1), TS #25/.06 (TS2), HCM #25/.04和HCM #25/.06在3个插入角度(0°, 10°, and 20°)和2种半径(5 mm and 3 mm)下的性能。采用专门的测试仪器通过检测循环失效数量(NCF)评估器械的循环疲劳强度。数据进行统计学评估,显著性水平设置为95%。

结果显示,3-mm半径根管中的器械循环疲劳强度明显低于在5-mm根管内(P < .05)。HCM #25/.06和所有.04锥度的器械入路角度为20°和在3-mm半径根管内入路角度为10°时NCF显著减少(P < .05),而TS2未见明显差异。在弯曲半径为5-mm时,尽管.06锥度的器械在每个测试角度中均无明显的NCF减少,但是.04锥度的器械在20°的测试中展现出NCF的显著降低(P < .05)。在相同型号器械的比较中,HCM的NCF比TS更高(P < .05)。在相同的热处理条件下.04锥度的器械比.06锥度的展现处更高的NCF (P < .05)。

结论:一个倾斜的入路角度会减少.04锥度热处理器械在所有测试弯曲半径下的循环疲劳强度。一个小的弯曲半径和入路角度的协同作用会减小热处理器械的疲劳强度。

原始出处:

Pedullà E, Maria La Rosa GR, et al. Cyclic Fatigue Resistance of Nickel-titanium Rotary Instruments according to the Angle of File Access and Radius of Root Canal. J Endod. 2020 Jan 3. pii: S0099-2399(19)30920-3. doi: 10.1016/j.joen.2019.11.015.

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    2020-05-12 nymo
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    2020-04-21 30397613
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    2020-01-26 tamgche
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