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Effect of dentine cutting efficiency on the lateral force created by torque-controlled rotary instruments.
International Endodontic Journal ( IF 5 ) Pub Date : 2020-05-29 , DOI: 10.1111/iej.13319
S Deari 1 , M Zehnder 1 , A Al-Jadaa 1
Affiliation  

AIM To study the impact of dentine cutting efficiency of rotary instruments on the lateral force they create when instrumenting simulated root canals in bovine dentine. METHODOLOGY Lateral cutting efficiency of austenitic files (ProTaper Universal) was compared to that of counterparts of a reported identical geometrical design with a martensite phase component (ProTaper Gold) in bovine dentine disks (n = 6). Instrument shapes were studied using digital microscopy. The intracanal lateral force exerted by the two systems in simulated premolars (n = 9) made from bovine incisor roots containing a standardized narrow root canal of 16 mm length was monitored using a testing apparatus equipped with a torque-controlled endodontic motor/handpiece. Data were compared using parametric statistics, alpha error = 0.05. RESULTS The geometrical design of the two systems under investigation was found to be identical. The martensitic nickel-titanium rotary files had a significantly (t-test, P < 0.05) higher lateral cutting efficiency than austenitic counterparts. This difference, however, did not impact the lateral force that was created when instrumenting simulated premolar root canals. Furthermore, lateral force peaks were generated with the progressively tapered instruments under investigation towards the full working length. Even though a glide path was prepared, the first instrument in the full-length sequence (S1) created the highest lateral force (anova/Tukey's HSD, P < 0.05). CONCLUSIONS The current experimental set-up allows the study of the lateral force generated during root canal instrumentation. This force was not influenced by the dentine cutting efficiency of the instruments under investigation, but rather by their geometrical design.

中文翻译:

牙本质切割效率对由扭矩控制的旋转器械产生的横向力的影响。

目的研究旋转器械的牙本质切割效率对在牛牙本质中植入模拟根管时产生的横向力的影响。方法学将奥氏体锉(ProTaper Universal)的横向切割效率与已报道的相同几何设计的牛牙质牙盘中的马氏体相成分(ProTaper Gold)的横向切割效率(n = 6)进行了比较。使用数字显微镜研究仪器形状。使用配备有扭矩控制的牙髓马达/手机的测试设备,监测这两个系统在由包含16 mm长的标准化窄根管的牛切牙根制成的模拟前磨牙(n = 9)中施加的管内横向力。使用参数统计比较数据,α误差= 0.05。结果发现,所研究的两个系统的几何设计是相同的。马氏体镍钛旋转锉比奥氏体锉具有显着(t检验,P <0.05)的横向切削效率。但是,这种差异不会影响在对模拟的磨牙前根管进行器械植入时所产生的横向力。此外,在研究过程中,逐渐倾斜的器械朝着整个工作长度产生了横向力峰值。即使准备了滑行路径,全长序列(S1)中的第一台仪器也产生了最大的侧向力(Anova / Tukey的HSD,P <0.05)。结论当前的实验设置可以研究根管器械产生的侧向力。
更新日期:2020-05-01
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