Torque Generation of the Endodontic Instruments: A Narrative Review.
Torque Generation of the Endodontic Instruments: A Narrative Review.
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DOI：
10.3390/ma15020664
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发表时间：
2022-01-17
期刊：
影响因子：
--
通讯作者：
Haapasalo M
中科院分区：
文献类型：
--
作者：
Kwak SW;Shen Y;Liu H;Kim HC;Haapasalo M
随着镍钛（NiTi）文件系统在根管治疗中的应用越来越广泛；因此，知识和NiTi文件的特点的理解是必不可少的牙医。在根管成形过程中可能发生意外的突然骨折，了解可能导致器械骨折的情况非常重要。扭矩被定义为旋转NiTi锉所需的力，可以被认为是产生应力的参数。无论根管状况如何，根管发动机通过调节扭矩来保持恒定的转速。旋转器械的根管成形过程是一系列需要扭矩的动作，对牙齿和NiTi器械都产生应力。产生的应力会引起NiTi器械和根管壁上的应变积累，导致器械和牙本质壁上出现微裂纹。因此，了解所产生的扭矩和应力对于防止器械和牙齿的断裂非常重要。这种应力是通过各种实验方法测量的，包括使用显微镜或计算机断层扫描观察微裂纹，在牙齿上附加应变片和有限元分析。本文综述了在不同实验条件下，牙体和仪器在仪器过程中产生的应力。还讨论了与转矩产生有关的因素。
As the use of nickel-titanium (NiTi) file systems for root canal therapy has become popular; hence, knowledge and understanding of the characteristics of NiTi files is essential for dentists. Unintended sudden fracture can occur during root canal shaping, and it is important to understand the conditions that may cause instrument fractures. Torque is defined as the force required to rotate the NiTi file and can be considered of as a parameter for the stress generated. The endodontic engine maintains a constant rotational speed by adjusting torque regardless of the root canal conditions. The process of root canal shaping by rotary instruments is a series of actions that requires torque and generates stress to both the teeth and the NiTi instruments. The generated stress may induce the strain accumulation on NiTi instrument and the canal wall and lead to the development of microcrack in the instrument and dentinal wall. Therefore, understanding of torque and stress generated is important to prevent the fractures to the instrument and the teeth. This stress has been measured using various experimental approaches, including microcrack observation by using a microscope or computed tomography, attaching strain gauges to the teeth, and finite element analysis. This review focuses on the stress generated to the teeth and the instrument during instrumentation under various experimental conditions. The factors related to torque generation are also discussed.
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