To evaluate torque maintenance and structural damage in implant components of different diameters subjected to a fatigue challenge. Thirty 10-mm-long, morse taper connection, titanium dental implants and their corresponding one-piece abutments were divided into three groups (n = 10) according to implant diameter: 4.3 mm (I4.3), 3.5 mm (I3.5), and 2.9 mm (I2.9). The implants were placed into a load-bearing fixture simulating bone tissue (modified G10), and the abutments were screwed into the implants to a final torque of 20 Ncm for the I4.3 and I3.5 and 15 Ncm for I2.9. The torque was secured by a digital torque meter. Cone-beam computed tomography (CBCT) scans were acquired and post-processed (e-Vol DX software) for all implant/abutment sets before and after subjecting them to fatigue in 37 °C distilled water (2 million cycles, constant load and frequency). The removal torque was measured using the same digital torque meter to calculate the difference in torque before and after fatigue. I2.9 showed substantial structural deformation compared with the other implant diameters (I3.5 and I4.3). However, the experimental groups did not show statistical differences for abutment loosening. Implants smaller than 3.5 mm in diameter have a higher probability of structural deformation than standard-diameter implants. The association between tomographic scans and e-Vol DX software showed satisfactory consistency with the direct assessment using the digital torque meter, offering an additional tool to evaluate implant component loosening and structural deformations.

中文翻译：

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不同直径植入部件在机械疲劳下的结构和扭矩变化

评估不同直径植入部件在疲劳挑战下的扭矩维持和结构损伤。30 个 10 毫米长的莫氏锥度连接钛牙种植体及其相应的一体式基台根据种植体直径分为三组（n = 10）：4.3 毫米（I4.3）、3.5 毫米（I3.5） ) 和 2.9 毫米 (I2.9)。将种植体放入模拟骨组织的承重固定装置（改良的 G10）中，并将基台拧入种植体，最终扭矩 I4.3 和 I3.5 为 20 Ncm，I2.9 为 15 Ncm。通过数字扭矩计确保扭矩。对所有种植体/基台组在 37°C 蒸馏水中经受疲劳之前和之后（200 万次循环、恒定负载和频率）进行锥形束计算机断层扫描 (CBCT) 扫描并进行后处理（e-Vol DX 软件） ）。使用相同的数字扭矩计测量移除扭矩，以计算疲劳前后的扭矩差。与其他种植体直径（I3.5 和 I4.3）相比，I2.9 显示出显着的结构变形。然而，实验组在基台松动方面没有表现出统计学差异。直径小于 3.5 毫米的种植体比标准直径的种植体发生结构变形的可能性更高。断层扫描和 e-Vol DX 软件之间的关联与使用数字扭矩计的直接评估显示出令人满意的一致性，为评估种植体部件松动和结构变形提供了额外的工具。