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J Endod:NiTi往复旋转器械模拟临床使用后的抗循环疲劳强度

2020-08-28 lishiting MedSci原创

这篇研究的目的是为了评估全新热处理NiTi往复旋转器械在2种模式下的抗循环疲劳强度:全新和预备了3个弯曲根管后。

这篇研究的目的是为了评估全新热处理NiTi往复旋转器械在2种模式下的抗循环疲劳强度:全新和预备了3个弯曲根管后。

研究共使用60根3种不同的NiTi系统(n=20 per system):ProDesign R (PDR 25.06), Reciproc Blue (RB 25.08v)和WaveOne Gold (WOG 25.07v)。使用30根全新的器械(n=10 per system)预备90颗弯曲单根的下颌前磨牙(n=30)。每根器械预备3个根管,在根管预备后将器械进行超声清洗并高压蒸汽灭菌。另外30根器械未曾使用(n=10 per system)。随后,将全新以及使用过的器械置于具有30°度弯曲并且弯曲半径为5-mm的人造根管内进行循环疲劳强度测试。记录器械疲劳的时间和循环次数。数据采用unpaired t检验进行组内比较。采用ANOVA和Tukey's检验进行组间的多重比较。

全新器械组间比较的结果显示,PDR具有最高的抗循环疲劳强度,随后为RB和WOG (P<0.05)。使用过的器械当中,WOG的抗疲劳强度最低(P<0.05)。全新和使用过器械的组内比较显示,WOG和PDR在模拟临床使用后其抗循环疲劳强度存在明显下降(P<0.05);而在RB器械内未见显著差异(P>0.05)。

结论:ProDesign R具有最高的抗循环疲劳强度,而WaveOne Gold不论是全新还是使用过均最低。模拟临床使用会降低ProDesign R和WaveOne Gold的抗循环疲劳强度,但对Reciproc Blue并无明显影响。

原始出处:

Jussaro Alves Duque, Clovis Monteiro Bramante, et al. Cyclic fatigue resistance of NiTi reciprocating instruments after simulated clinical use. J Endod., 2020 Aug 17;S0099-2399(20)30607-5. doi: 10.1016/j.joen.2020.08.010.

 

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    2020-09-28 nymo
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    2020-08-30 tamgche
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