Int J Oral Maxillofac Implants. 2019 July/August;34(4):886–890. doi: 10.11607/jomi.7361. Epub 2019 Apr 1.
The purpose of this in vitro study was to determine the minimum installation torque required to attach the transducer (measuring peg) to the implant to provide an accurate assessment of implant stability using resonance frequency analysis.
One hundred 4 ×11-mm screw-shaped titanium implants were inserted into a uniform polyurethane block with similar density to bone in a standardized surgical protocol. The implants were distributed into 10 groups, with 10 implants each (G1 to G10). In G1, the transducer was manually attached by a female operator and in G2 by a male operator using the manual connector provided by the manufacturer. For the remaining groups (G3 to G10), the transducers were installed using a connector adapted to a digital torque wrench with different torque settings: 3 Ncm (G3), 4 Ncm (G4), 5 Ncm (G5), 6 Ncm (G6), 10 Ncm (G7), 13 Ncm (G8), 17 Ncm (G9), and 20 Ncm (G10). Stability was measured for all groups using the Osstell equipment (Diagnosis of Integration) and the implant stability quotient (ISQ) annotated for statistical comparison between the groups.
The mean ± standard deviation ISQ values for groups G1 to G10 were 9.50 ± 5.54, 19.05 ± 2.67, 29.25 ± 4.22, 26.55 ± 5.37, 40.90 ± 0.99, 69.60 ± 2.41, 71.30 ± 0.82, 71.20 ± 1.32, 72.40 ± 0.97, and 70.90 ± 0.88, respectively. Statistical comparisons determined that the amplitudes of the confidence intervals, relative to the standard deviations, were lowest for groups G5, G7, G8, G9, and G10. For the means, the lowest amplitudes of the confidence intervals were observed in G6, G7, G8, G9, and G10. When checking the conjugated confidence intervals (mean and standard deviation), the results were homogenous for G7, G8, G9, and G10. When the torque of 20 Ncm was reached, the connection between the transducer and the implant failed.
In this in vitro model experiment, transducer torques between 10 and 17 Ncm appear to be adequate for accurate measurement of implant stability, allowing more precise comparisons without damaging the prosthetic connection in the implant.
本体外研究旨在确定将传感器（测量钉）固定到种植体上所需的最小安装扭矩，以便使用共振频率分析对种植体稳定性进行准确评估。
按照标准化手术方案，将 100 个 4×11mm 螺纹状钛种植体插入到具有类似骨密度的均匀聚氨酯块中。将种植体分为 10 组，每组 10 个（G1 至 G10）。在 G1 中，由女性操作人员手动连接传感器，在 G2 中由制造商提供的手动连接器由男性操作人员连接。对于其余组（G3 至 G10），使用与数字扭矩扳手适配的连接器安装传感器，具有不同的扭矩设置：3 Ncm（G3）、4 Ncm（G4）、5 Ncm（G5）、6 Ncm（G6）、10 Ncm（G7）、13 Ncm（G8）、17 Ncm（G9）和 20 Ncm（G10）。使用 Osstell 设备（整合诊断）对所有组进行稳定性测量，并为组间统计比较标记种植体稳定性指数（ISQ）。
G1 至 G10 组的平均±标准偏差 ISQ 值分别为 9.50±5.54、19.05±2.67、29.25±4.22、26.55±5.37、40.90±0.99、69.60±2.41、71.30±0.82、71.20±1.32、72.40±0.97 和 70.90±0.88。统计比较确定，置信区间的幅度相对于标准偏差，在 G5、G7、G8、G9 和 G10 组中最低。对于平均值，在 G6、G7、G8、G9 和 G10 组中观察到置信区间的最低幅度。当检查共轭置信区间（均值和标准差）时，G7、G8、G9 和 G10 的结果是同质的。当达到 20 Ncm 的扭矩时，传感器和种植体之间的连接失效。
在这项体外模型实验中，10 至 17 Ncm 的传感器扭矩似乎足以准确测量种植体稳定性，允许更精确的比较，而不会损坏种植体中的修复连接。
