螺钉和宿主因素对旋入扭矩和拔出强度的影响。
Effects of screw and host factors on insertion torque and pullout strength.
机构信息
Department of Orthodontics, Orthodontic Department, St Louis University, St Louis, MO, USA.
出版信息
Angle Orthod. 2012 Jul;82(4):603-10. doi: 10.2319/070111-427.1.
OBJECTIVE
To experimentally study the effects of altering implant length, outer diameter, cortical bone thickness, and cortical bone density on the primary stability of orthodontic miniscrew implants (MSIs).
MATERIALS AND METHODS
Maximum insertion torque (IT) and pullout strength (POS) of 216 MSIs were measured in synthetic bone with different cortical densities (0.64 g/cc or 0.55 g/cc) and cortical thicknesses (1 mm or 2 mm). Three MSIs were evaluated: 6-mm long/1.75-mm outer diameter, 3-mm long/1.75-mm outer diameter, and 3-mm long/2.0-mm outer diameter. To test POS, a vertical force was applied at the rate of 5 mm/min until failure occurred.
RESULTS
The 6-mm MSIs displayed significantly (P < .001) higher IT and POS than the 3-mm MSIs did. The 3-mm MSIs with 2.0-mm outer diameters showed significantly higher (P < .001) IT and POS than the 3-mm MSIs with 1.75-mm outer diameters. The IT and POS were significantly (P < .001) greater for the MSIs placed in thicker and denser cortical bone.
CONCLUSION
Both outer diameter and length affect the stability of MSIs. Increases in cortical bone thickness and cortical bone density increase the primary stability of the MSIs.
目的
通过实验研究改变种植体长度、外径、皮质骨厚度和皮质骨密度对正畸微种植体（MSI）初始稳定性的影响。
材料与方法
在不同皮质骨密度（0.64 g/cc 或 0.55 g/cc）和皮质骨厚度（1mm 或 2mm）的合成骨中测量了 216 个 MSI 的最大植入扭矩（IT）和拔出强度（POS）。评估了三种 MSI：长 6mm/外径 1.75mm、长 3mm/外径 1.75mm 和长 3mm/外径 2.0mm。为了测试 POS，以 5mm/min 的速率垂直施加力，直到发生故障。
结果
6mm 的 MSI 显示出明显更高的 IT 和 POS（P <.001），比 3mm 的 MSI 更高。外径为 2.0mm 的 3mm MSI 的 IT 和 POS 明显高于（P <.001）外径为 1.75mm 的 3mm MSI。在较厚和密度较高的皮质骨中，MSI 的 IT 和 POS 明显更高（P <.001）。
结论
外径和长度都影响 MSI 的稳定性。增加皮质骨厚度和皮质骨密度可提高 MSI 的初始稳定性。
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