自攻型和自钻型正畸微螺钉植入扭矩与机械稳定性的比较评估——一项体外研究
Comparative evaluation of insertion torque and mechanical stability for self-tapping and self-drilling orthodontic miniscrews - an in vitro study.
作者信息
Tepedino Michele, Masedu Francesco, Chimenti Claudio
机构信息
Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, Viale S.Salvatore, Edificio Delta 6, 67100, L'Aquila, Italy.
出版信息
Head Face Med. 2017 May 30;13(1):10. doi: 10.1186/s13005-017-0143-3.
BACKGROUND
The aim of the present study was to evaluate the relationship between insertion torque and stability of miniscrews in terms of resistance against dislocation, then comparing a self-tapping screw with a self-drilling one.
METHODS
Insertion torque was measured during placement of 30 self-drilling and 31 self-tapping stainless steel miniscrews (Leone SpA, Sesto Fiorentino, Italy) in synthetic bone blocks. Then, an increasing pulling force was applied at an angle of 90° and 45°, and the displacement of the miniscrews was recorded.
RESULTS
The statistical analysis showed a statistically significant difference between the mean Maximum Insertion Torque (MIT) observed in the two groups and showed that force angulation and MIT have a statistically significant effect on miniscrews stability. For both the miniscrews, an angle of 90° between miniscrew and loading force is preferable in terms of stability.
CONCLUSIONS
The tested self-drilling orthodontic miniscrews showed higher MIT and greater resistance against dislocation than the self-tapping ones.
背景
本研究的目的是评估微型螺钉的插入扭矩与稳定性之间在抗脱位方面的关系，然后比较自攻螺钉和自钻螺钉。
方法
在合成骨块中植入30颗自钻型和31颗自攻型不锈钢微型螺钉（意大利佛罗伦萨塞斯托的Leone SpA公司生产）时测量插入扭矩。然后，以90°和45°的角度施加逐渐增加的拉力，并记录微型螺钉的位移。
结果
统计分析显示两组观察到的平均最大插入扭矩（MIT）之间存在统计学显著差异，并且表明力的角度和MIT对微型螺钉的稳定性有统计学显著影响。就稳定性而言，对于两种微型螺钉，微型螺钉与加载力之间90°的角度更为可取。
结论
测试的自钻型正畸微型螺钉比自攻型微型螺钉表现出更高的MIT和更大的抗脱位能力。
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