Dalla Rosa Fernando, Burmann Paola Fp, Ruschel Henrique C, Vargas Ivana A, Kramer Paulo F
Private practice, Caxias do Sul, RS, Brazil.
Private practice, Santo Ângelo, RS, Brazil.
Acta Odontol Latinoam. 2016 Dec;29(3):248-254.
This study sought to assess the fracture torque resistance of mini-implants used for orthodontic anchorage. Five commercially available brands of mini-implants were used (SIN®, CONEXÃO®, NEODENT®, MORELLI®, andFORESTADENT®). Ten mini-implants of each diameter of each brand were tested, for a total 100 specimens. The mini-implants were subject to a static torsion test as described in ASTMstandard F543. Analysis of variance (ANOVA) with the Tukey multiple comparisons procedure was used to assess results. Overall, mean fracture strength ranged from 15.7 to 70.4 N·cm. Mini-implants with larger diameter exhibited higher peak torque values at fracture and higher yield strength, regardless of brand. In addition, significant differences across brands were observed when implants were stratified by diameter. In conclusion, larger mini-implant diameter is associated with increased fracture torque resistance. Additional information on peak torque values at fracture of different commercial brands of mini-implants may increase the success rate of this orthodontic anchorage modality.
本研究旨在评估用于正畸支抗的微型种植体的抗折断扭矩。使用了五个市售品牌的微型种植体（SIN®、CONEXÃO®、NEODENT®、MORELLI®和FORESTADENT®）。每个品牌每种直径的微型种植体测试10个，共100个样本。微型种植体按照ASTM标准F543进行静态扭转试验。采用方差分析（ANOVA）和Tukey多重比较程序评估结果。总体而言，平均折断强度在15.7至70.4 N·cm之间。无论品牌如何，直径较大的微型种植体在折断时表现出更高的峰值扭矩值和更高的屈服强度。此外，当按直径对种植体进行分层时，各品牌之间存在显著差异。总之，较大的微型种植体直径与增加的抗折断扭矩相关。关于不同商业品牌微型种植体折断时峰值扭矩值的更多信息可能会提高这种正畸支抗方式的成功率。
