Department of Orthodontics, Division of Clinical Research, Dental Research Center, School of Dentistry, Nihon University, Tokyo, Japan.
Am J Orthod Dentofacial Orthop. 2010 May;137(5):588.e1-5; discussion 588-9. doi: 10.1016/j.ajodo.2009.05.019.
The placement and removal torques of mini-implants were evaluated as an index of implant stability. We examined factors affecting the initial and long-term stability of mini-implants.
We measured the placement and removal torques of 134 mini-implants placed in buccal posterior alveolar bone and assessed the relationships among placement and removal torques, placement period, age, sex, and cortical bone thickness. The mini-implants were machine-surfaced, 1.6 mm in diameter and 8 mm long. A torque screwdriver was used to measure the peak torque values.
The placement and removal torques averaged approximately 8 and 4 N cm, respectively. A torque of 4 N cm suggests sufficient anchorage capability for mini-implants. No significant correlation between placement and removal torques was found. Placement torque was significantly related to age and cortical bone thickness in the maxilla, whereas removal torque was not significantly related to placement period, age, sex, or cortical bone thickness.
微型种植体的植入和去除扭矩可作为种植体稳定性的指标。我们研究了影响微型种植体初始和长期稳定性的因素。
我们测量了 134 个植入颊侧后牙槽骨的微型种植体的植入和去除扭矩，并评估了植入和去除扭矩、植入时间、年龄、性别和皮质骨厚度之间的关系。微型种植体采用机械表面处理，直径 1.6 毫米，长 8 毫米。使用扭矩螺丝刀测量峰值扭矩值。
植入和去除扭矩的平均值分别约为 8 和 4 N cm。4 N cm 的扭矩表明微型种植体具有足够的锚固能力。植入和去除扭矩之间没有显著相关性。植入扭矩与上颌的年龄和皮质骨厚度显著相关，而去除扭矩与植入时间、年龄、性别或皮质骨厚度无显著相关性。
