Han Cheol-Min, Watanabe Keiichiro, Tsatalis Andrea E, Lee Damian, Zheng Fengyuan, Kyung Hee-Moon, Deguchi Toru, Kim Do-Gyoon
Division of Orthodontics, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA.
Division of Restorative and Prosthetic dentistry, College of Dentistry, The Ohio State University, Columbus, OH 43210, USA.
Clin Biomech (Bristol). 2019 Oct;69:21-27. doi: 10.1016/j.clinbiomech.2019.06.016. Epub 2019 Jun 26.
Miniscrew has been widely used as an absolute anchorage in orthodontic treatment. Types of miniscrew with different diameter, length, shape, and thread dimensions may have a substantial effect on mechanical stability of the miniscrew system. Thus, the objective of this study was to evaluate miniscrew type-dependent mechanical stability to assess mechanical properties of miniscrew systems in various thickness of artificial bone block using different measurement tools.
Two types of miniscrews (15 Tomas and 15 AbsoAnchor) were placed in artificial bone block with different thickness of 1.5, 2.0, 3.0 mm. Values of maximum insertion torque, removal torque, Periotest, implant stability quotient, static stiffness, dynamic stiffness, and energy dissipation ability were assessed for each miniscrew system.
The maximum insertion torque, removal torque, implant stability quotient, static and dynamic stiffness values significantly increased when the miniscrews were placed in thicker bone block while Periotest values decreased. The static stiffness, Periotest and implant stability quotient values were significantly correlated each other and also with other mechanical properties (p < 0.001) except tan δ (p > 0.35). However, the slopes of some correlations and absolute values of measurement were significantly different dependent on the miniscrew types (p < 0.025).
The current findings suggest that miniscrew type-dependent calibrations are required to estimate mechanical stability of the miniscrew systems despite the utilization of same measurement tool.
微型螺钉已被广泛用作正畸治疗中的绝对支抗。不同直径、长度、形状和螺纹尺寸的微型螺钉类型可能会对微型螺钉系统的机械稳定性产生重大影响。因此，本研究的目的是评估微型螺钉类型依赖性机械稳定性，以使用不同测量工具评估微型螺钉系统在各种厚度人工骨块中的机械性能。
将两种类型的微型螺钉（15 Tomas和15 AbsoAnchor）植入厚度分别为1.5、2.0、3.0毫米的人工骨块中。评估每个微型螺钉系统的最大插入扭矩、拆除扭矩、牙周探针值、种植体稳定性商数、静态刚度、动态刚度和能量耗散能力。
当微型螺钉植入较厚的骨块中时，最大插入扭矩、拆除扭矩、种植体稳定性商数、静态和动态刚度值显著增加，而牙周探针值降低。静态刚度、牙周探针值和种植体稳定性商数之间以及与其他机械性能之间均存在显著相关性（p < 0.001），但损耗因子（p > 0.35）除外。然而，某些相关性的斜率和测量的绝对值因微型螺钉类型而异（p < 0.025）。
目前的研究结果表明，尽管使用相同的测量工具，但仍需要根据微型螺钉类型进行校准，以估计微型螺钉系统的机械稳定性。
