Silva Emmanuel João Nogueira Leal, Villarino Laise Silva, Vieira Victor Talarico Leal, Accorsi-Mendonça Thais, Antunes Henrique Dos Santos, De-Deus Gustavo, Lopes Hélio Pereira
Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
J Endod. 2016 Dec;42(12):1789-1793. doi: 10.1016/j.joen.2016.08.026. Epub 2016 Oct 21.
This study evaluated the bending resistance and cyclic fatigue life of a new single-file reciprocating instrument (Unicone; Medin, Nové Město na Moravě, Czech Republic). Reciproc (VDW, Munich, Germany) and WaveOne (Dentsply Maillefer) instruments were used as references for comparison.
Flexibility was determined by 45° bending tests using a universal testing machine. The cyclic fatigue test was performed using a custom-made device. For this test, an artificial canal with a 60° angle and a 5-mm radius of curvature was used. Scanning electron microscopic analysis was performed to determine the mode of fracture and possible deformations at the helical shaft. Statistical analysis for the bending resistance test was performed using parametric methods (ie, 1-way analysis of variance). Post hoc pair-wise comparisons were performed using the Tukey test for multiple comparisons (P < .05). Weibull analysis was used to calculate the mean life, beta, and eta parameters.
Reciproc presented significantly lower bending resistance than the other tested systems (P < .05), whereas no differences were observed between WaveOne and Unicone (P > .05). When mean life was compared among the brands, Reciproc lasted longer than WaveOne with a probability of 99.9%, longer than Unicone in the "RECIPROC ALL" mode with a probability of 99.9%, and longer than Unicone in the "WAVEONE ALL" mode with a probability of 99.9% (all statistically significant). Moreover, WaveOne lasted longer than Unicone in the "RECIPROC ALL" mode with a probability of 98.5% and longer than Unicone in the "WAVEONE ALL" mode with a probability of 99.8% (all statistically significant). Finally, Unicone in the "RECIPROC ALL" mode lasted longer than Unicone in the "WAVEONE ALL" mode with a probability of 95.3% (statistically significant).
The new reciprocating instrument Unicone showed lower cyclic fatigue resistance compared with Reciproc R25 and WaveOne Primary files.
本研究评估了一种新型单根往复式器械（Unicone；Medin，捷克共和国摩拉维亚地区新梅斯托）的抗弯曲性能和循环疲劳寿命。将Reciproc（德国慕尼黑VDW公司）和WaveOne（登士柏美福公司）器械作为对照进行比较。
使用万能试验机通过45°弯曲试验测定柔韧性。循环疲劳试验使用定制装置进行。对于该试验，采用了一个角度为60°、曲率半径为5毫米的人工根管。进行扫描电子显微镜分析以确定骨折模式和螺旋轴处可能的变形。抗弯曲试验的统计分析采用参数方法（即单因素方差分析）。使用Tukey检验进行事后两两比较以进行多重比较（P <.05）。采用威布尔分析计算平均寿命、β和η参数。
Reciproc的抗弯曲性能明显低于其他受试系统（P <.05），而WaveOne和Unicone之间未观察到差异（P >.05）。当比较各品牌的平均寿命时，Reciproc比WaveOne持续时间长的概率为99.9%，在“RECIPROC ALL”模式下比Unicone长的概率为99.9%，在“WAVEONE ALL”模式下比Unicone长的概率为99.9%（均具有统计学意义）。此外，WaveOne在“RECIPROC ALL”模式下比Unicone持续时间长的概率为98.5%，在“WAVEONE ALL”模式下比Unicone长的概率为99.8%（均具有统计学意义）。最后，Unicone在“RECIPROC ALL”模式下比在“WAVEONE ALL”模式下持续时间长的概率为95.3%（具有统计学意义）。
新型往复式器械Unicone与Reciproc R25和WaveOne Primary锉相比，循环疲劳抗性较低。
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