Kaval Mehmet Emin, Capar Ismail Davut, Ertas Hüseyin, Sen Bilge Hakan
Department of Endodontology, School of Dentistry, Ege University, Bornova, Izmir, Turkey.
Department of Endodontology, School of Dentistry, Katip Çelebi University, Izmir, Turkey.
Clin Oral Investig. 2017 Jun;21(5):1527-1530. doi: 10.1007/s00784-016-1917-x. Epub 2016 Jul 26.
The purpose of the present study was to evaluate the cyclic fatigue resistance of F6 SkyTaper (Komet Brasseler, Lemgo, Germany), K3XF (SybronEndo, Orange, CA, USA), new generation OneShape (Micro Mega, Besancon, France) and TRUShape 3D conforming files (Dentsply Tulsa Dental Specialties, Tulsa, OK, USA).
Ten instruments from each group were selected and allowed to rotate using a low-torque motor in a stainless steel block with 1.5 mm diameter, 3 mm radius of 60° angle of curvature at the manufacturer's recommended speed, and the number of cycles (NCF) from the beginning to the fracture was recorded. The data were analyzed using one-way ANOVA followed by post-hoc Tukey's test (P = 0.05).
The ranking of the groups from the highest to the lowest NCF was as follows: F6 SkyTaper (959 ± 92), K3XF (725 ± 71), TRUShape (575 ± 84) and OneShape (289 ± 58). Statistically significant differences were detected between all groups (P < 0.05).
Within the limitations of this study, F6 SkyTaper instruments presented the highest cyclic fatigue resistance among the tested instruments. The S-shaped cross-sectional design of F6 SkyTaper instruments could be the most important factor on the superior cyclic life span of these instruments.
In endodontic practice, preferring the instruments with higher cyclic fatigue resistance would help to minimize the risk of instrument fractures; therefore especially during the preparation of curved canals, instruments with smaller core area and less cross-sectional metal mass, which could lead higher flexibility, can be proposed.
本研究旨在评估F6 SkyTaper（德国莱姆戈的Komet Brasseler公司）、K3XF（美国加利福尼亚州奥兰治的SybronEndo公司）、新一代OneShape（法国贝桑松的Micro Mega公司）和TRUShape 3D贴合锉（美国俄克拉何马州塔尔萨的登士柏西诺德牙科特种产品公司）的抗循环疲劳性能。
从每组中选取10支器械，使用低扭矩马达在直径1.5毫米、曲率半径3毫米、弯曲角度60°的不锈钢块中以制造商推荐的速度旋转，记录从开始到折断的循环次数（NCF）。采用单因素方差分析，随后进行事后Tukey检验（P = 0.05）对数据进行分析。
各组NCF从高到低的排名如下：F6 SkyTaper（959±92）、K3XF（725±71）、TRUShape（575±84）和OneShape（289±58）。所有组之间均检测到统计学上的显著差异（P < 0.05）。
在本研究的局限性内，F6 SkyTaper器械在测试器械中表现出最高的抗循环疲劳性能。F6 SkyTaper器械的S形横截面设计可能是这些器械具有卓越循环寿命的最重要因素。
在牙髓治疗实践中，选择具有更高抗循环疲劳性能的器械有助于将器械折断的风险降至最低；因此，特别是在弯曲根管的预备过程中，可以推荐具有较小核心面积和较少横截面金属质量、从而具有更高柔韧性的器械。
