Removal torque of miniscrews used for orthodontic anchorage--a preliminary report.
Removal torque of miniscrews used for orthodontic anchorage--a preliminary report.
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发表时间：
2006-03
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通讯作者：
Yi-Jane Chen;Yuan-Hou Chen;Li-Deh Lin;C. Yao
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作者：
Yi-Jane Chen;Yuan-Hou Chen;Li-Deh Lin;C. Yao
目的 在正畸治疗期间，立即装载微型螺钉和微型钢板等种植体锚固器以进行固定。本研究的目的是测量临床使用后立即加载的微型螺钉的移除扭矩，并确定与该值相关的可能因素。材料和方法 从 29 名错牙合患者中取出 46 颗微型螺钉，并用扭矩计测量取出扭矩。对移除扭矩值进行统计分析，以了解不同临床特征的可能关联。结果 平均移除扭矩值为 1.10 kg x cm，50% 种植体的移除扭矩大于 0.89 kg x cm (8.7 N x cm)。下颌骨的移除扭矩值明显高于上颌骨。 15 毫米和 17 毫米微型螺钉的拆卸扭矩明显高于 13 毫米微型螺钉。因此，植入位置和微型螺钉长度是与移除扭矩相关的重要因素。然而，移除扭矩值与年龄、性别、愈合时间或功能时间之间没有显着相关性。讨论 当微型螺钉用作直立尖磨牙的锚固时，逆时针方向的过大扭矩可能会使螺钉松动。根据本次调查获得的测量结果，微型螺钉足以维持直立力矩。结论 本研究人群中大多数微型螺钉在作为正畸支抗立即加载时的移除扭矩值大于 0.89 kg x cm，这足以使这些种植体实现其在 3 维牙齿移动中作为锚固的目的。
PURPOSE Implant anchors such as miniscrews and miniplates have been loaded immediately for anchorage during orthodontic treatment. The purpose of this study was to measure the removal torque of immediately loaded miniscrews after clinical usage and to determine the possible factors associated with this value. MATERIALS AND METHODS From 29 patients with malocclusions, 46 miniscrews were removed, and removal torque was measured with a torque gauge. Removal torque values were subjected to statistical analysis for possible association of different clinical characteristics. RESULTS The mean removal torque value was 1.10 kg x cm, and removal torques for 50% of the implants were greater than 0.89 kg x cm (8.7 N x cm). Removal torque values were significantly higher in the mandible than in the maxilla. The removal torques of 15-mm and 17-mm miniscrews were significantly higher than those of 13-mm miniscrews. Therefore, the site of implantation and miniscrew length were important factors associated with removal torque. However, there was no significant correlation between the removal torque value and age, gender, healing time, or time in function. DISCUSSION When miniscrews are used as anchorage for uprighting tipped molars, excessive torque in a counterclockwise direction may loosen them. From the measurements obtained in this investigation, miniscrews can sufficiently sustain an uprighting moment. CONCLUSION The removal torque values of the majority of miniscrews in this study population when loaded immediately as orthodontic anchorage were greater than 0.89 kg x cm, and this was sufficient for these implants to fulfill their purpose as anchors in 3-dimensional tooth movements.