This study aimed to clarify the effects of bone remodeling on biomechanical behavior in a patient with a mandibular implant-supported overdenture by comparing computed tomography-based finite element analyses (CT-FEA) with two time points of CT data. The present FEA was based on CT data collected from a 62-year-old female subject, who wore a mandibular implant overdenture supported by four dental implants with bar attachment. Two kinds of FE models were constructed from CT data taken at two time points: pre-implantation (Original-model) and 12 years post-implantation (Aged-model). FE models consisted of patient-specific model geometry and heterogeneous material properties. The deviation analysis was carried out to assess the changes of bone mass over a period of 12 years. The results show an averaging of intraosseous stress and strain energy density between the implant regions in Aged-model. The results of the morphological assessments demonstrated that the bone mass and quality had significantly changed over 12 years. Area-specific bone resorption was also observed at the bone surrounding each implant. The combined findings indicate that the averaging of mechanical variables was due to chronological changes in bone morphology, suggesting adaptation to mechanical loads by peri-implant bone remodeling.

本研究旨在通过将基于计算机断层扫描的有限元分析（CT-FEA）与两个CT数据点进行比较，以阐明下颌植入物支持的覆盖义齿患者的骨重塑对生物力学行为的影响。当前的FEA基于从62岁的女性受试者中收集的CT数据，该女性受试者的下颌种植义齿由4个带有杆附件的牙科种植体支持。根据在两个时间点获取的CT数据构建了两种有限元模型：植入前（原始模型）和植入后12年（老年模型）。FE模型由特定于患者的模型几何形状和异质材料特性组成。进行偏差分析以评估12年内骨量的变化。结果表明，在老年模型中，骨内应力和植入物区域之间的应变能密度平均。形态学评估的结果表明，在过去的12年中，骨量和质量发生了显着变化。在每个植入物周围的骨头处也观察到了特定区域的骨吸收。综合发现表明，机械变量的平均值是由于骨形态的时间变化所致，表明通过种植体周围骨重塑可以适应机械负荷。