University of Alberta, Department of Mechanical Engineering, Edmonton, Alberta, T6G 2R3, Canada.
University of Alberta, Department of Medicine, Edmonton, Alberta, T6G 2R3, Canada.
J Mech Behav Biomed Mater. 2024 Jun;154:106537. doi: 10.1016/j.jmbbm.2024.106537. Epub 2024 Apr 4.
The Advanced System for Implant Stability Testing (ASIST) is a device currently being developed to noninvasively measure implant stability by estimating the mechanical stiffness of the bone-implant interface, which is reported as the ASIST Stability Coefficient (ASC). This study's purpose was to determine whether changes in density, bonding, and drilling technique affect the measured vibration of a dental implant, and whether they can be quantified as a change in the estimated BII stiffness. Stability was also measured using RFA, insertion torque (IT) and the pullout test. Bone-level tapered implants (4.1 mm diameter, 10 mm length) were inserted in polyurethane foam as an artificial bone substitute. Samples were prepared using different bone densities (20, 30, 40 PCF), drilling sequences, and superglue to simulate a bonded implant. Measurements were compared across groups at a significance level of 0.05. The ASC was able to indicate changes in each factor as a change in the interfacial stiffness. IT and pullout force values also showed comparable increases. Furthermore, the relative difference in ISQ values between experimental groups was considerably smaller than the ASC. While future work should be done using biological bone and in-vivo systems, the results of this in-vitro study suggest that modelling of the implant system with a vibration-based approach may provide a noninvasive method of assessing the mechanical stability of the implant.
高级种植体稳定性测试系统（ASIST）是一种正在开发中的设备，用于通过估计骨-种植体界面的机械刚度来非侵入性地测量种植体稳定性，其报告为 ASIST 稳定性系数（ASC）。本研究旨在确定密度、结合和钻孔技术的变化是否会影响种植体的测量振动，并确定它们是否可以量化为估计的 BII 刚度的变化。还使用 RFA、插入扭矩（IT）和拔出试验来测量稳定性。将骨水平锥形种植体（直径 4.1mm，长度 10mm）插入聚氨酯泡沫中作为人工骨替代物。使用不同的骨密度（20、30、40 PCF）、钻孔顺序和超级胶水来制备样品，以模拟结合的种植体。在 0.05 的显著水平上比较了各组之间的测量值。ASC 能够指示每个因素作为界面刚度变化的变化。IT 和拔出力值也显示出可比的增加。此外，实验组之间 ISQ 值的相对差异明显小于 ASC。虽然未来的工作应该使用生物骨和体内系统进行，但这项体外研究的结果表明，基于振动的方法对种植体系统进行建模可能提供一种评估种植体机械稳定性的非侵入性方法。
