Smith Angie, Hosein Yara K, Dunning Cynthia E, Tassi Ali
a Private practice, Kelowna, British Columbia, Canada.
Angle Orthod. 2015 Jan;85(1):26-32. doi: 10.2319/112213-860.1.
To investigate the fracture resistance of six commonly used self-drilling orthodontic mini-implants by comparing their respective fracture torques during insertion.
Ninety self-drilling mini-implants from six manufacturers (Aarhus, Dual-Top, OrthoEasy, Tomas-pin, Unitek, and VectorTAS), with diameters ranging from 1.4 to 1.8 mm, were inserted into acrylic blocks using a custom-made insertion device. Insertion torques were measured using a 6-degree-of-freedom load cell fixed to the base of the acrylic blocks, and peak torques experienced at the time of fracture for each of the mini-implants were recorded. One-way analysis of variance (α = .05) was used to compare the fracture torques among the six different groups.
Statistical analysis revealed significant differences (P < .05) in the peak fracture torques among mini-implant groups. Mean fracture torques ranked as follows: Unitek (72 Ncm) > Tomas-pin (36 Ncm) > Dual-Top (32 Ncm) ≈ VectorTAS (31 Ncm) > OrthoEasy (28 Ncm) > Aarhus (25 Ncm), with significant differences found between all manufacturers, except for Dual-Top and VectorTAS.
Mini-implants tested showed a wide range of torque at fracture depending on the manufacturer, with only a weak correlation between mini-implant diameter and fracture resistance. This torque should be considered at the time of mini-implant insertion to minimize the risk of implant fracture, especially in areas of high-density bone without predrilling.
通过比较六种常用自攻型正畸微型种植体在植入过程中的各自断裂扭矩，研究其抗断裂性能。
使用定制的植入装置，将来自六个制造商（奥胡斯、双顶尖、正畸易、托马斯钉、Unitek和VectorTAS）的90枚直径在1.4至1.8毫米之间的自攻型微型种植体植入丙烯酸树脂块中。使用固定在丙烯酸树脂块底部的六自由度测力传感器测量植入扭矩，并记录每个微型种植体断裂时所承受的峰值扭矩。采用单因素方差分析（α = 0.05）比较六个不同组之间的断裂扭矩。
统计分析显示，微型种植体组之间的峰值断裂扭矩存在显著差异（P < 0.05）。平均断裂扭矩排名如下：Unitek（72 Ncm）> 托马斯钉（36 Ncm）> 双顶尖（32 Ncm）≈ VectorTAS（31 Ncm）> 正畸易（28 Ncm）> 奥胡斯（25 Ncm），除双顶尖和VectorTAS外，所有制造商之间均存在显著差异。
测试的微型种植体根据制造商不同，断裂时的扭矩范围较广，微型种植体直径与抗断裂性之间仅有微弱的相关性。在植入微型种植体时应考虑此扭矩，以尽量降低种植体断裂的风险，尤其是在未预先钻孔的高密度骨区域。
