Teixeira Ana Beatriz V, Beja Gabriela B S P, Shimano Antônio Carlos, Macedo Ana Paula, Oliscovicz Nathalia Ferraz, Reis Andréa C dos
Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.
Braz Dent J. 2013;24(3):213-7. doi: 10.1590/0103-6440201302165.
This study evaluated the profile of implants subjected to torsion test. Four types of implants (Conexão®) were analyzed: Master Porous (MP - external hexagon, cylindrical, double-porous surface implants; 11.5 X 3.75 mm), Master Screw (MS - external hexagon, cylindrical, machined implants; 11.5 X 3.75 mm), Conect Conic (CC - external hexagon, cylindrical, machined implants; 11.5 X 3.5 mm) and Master Conect AR (CA - internal hexagon, cylindrical, double-porous surface implants; 11.5 X 3.75 mm). The Nikon® model C profile projector was used for the analysis before and after torsion test with a Mackena® model MK-20XX digital torque meter. The measures analyzed in the profile of implants were: diameter and height of the platform, diameter of the screw/platform connection, angle of the screw/platform connection, external diameter, internal diameter, thread pitch, height and length of the thread. Statistical analysis was performed using ANOVA and Tukey test at 5% significance level. The torsion test caused a visible deformity on the external implant profile. There was a statistical difference among the implants before and after torsion (p<0.05) for the variables: platform diameter, platform height, diameter of the screw/platform connection and length. Changes were observed in platform height of CC and CA, fracture of CA implants, fracture of the MP and MS assembler/connectors, and internal thread stripping of CC. Thus, it was concluded that excessive or some unadvised torque by the manufacturer can lead to changes in different geometric measurements of implants.
本研究评估了接受扭转试验的种植体的轮廓。分析了四种类型的种植体（Conexão®）：Master Porous（MP - 外六角、圆柱形、双孔隙表面种植体；11.5×3.75毫米）、Master Screw（MS - 外六角、圆柱形、机械加工种植体；11.5×3.75毫米）、Conect Conic（CC - 外六角、圆柱形、机械加工种植体；11.5×3.5毫米）和Master Conect AR（CA - 内六角、圆柱形、双孔隙表面种植体；11.5×3.75毫米）。在扭转试验前后，使用尼康®C型轮廓投影仪和Mackena®MK - 20XX型数字扭矩计进行分析。在种植体轮廓中分析的测量指标包括：平台的直径和高度、螺钉/平台连接的直径、螺钉/平台连接的角度、外径、内径、螺距、螺纹的高度和长度。使用方差分析和Tukey检验进行统计分析，显著性水平为5%。扭转试验在种植体外轮廓上造成了明显的变形。对于平台直径、平台高度、螺钉/平台连接的直径和长度这些变量，扭转前后种植体之间存在统计学差异（p<0.05）。观察到CC和CA的平台高度发生了变化、CA种植体出现骨折、MP和MS组装器/连接器出现骨折以及CC的内螺纹剥脱。因此，得出结论，制造商施加的过大或不当扭矩会导致种植体不同几何测量值发生变化。
