【摘要】 背景:目前有限元法广泛应用于骨科生物力学分析,评价指标主要包括Max von Mises应力和应力的传递和分布概况。但由于体内的复杂生物力学环境和个体化差异明显,很难由具体的案例得出解决临床相关的方法。目的:分析高度吸收上颌窦区种植体的生物力学分布状况。方法:应用Simplant建立了一个位于上颌第二磨牙位置的5.5mm×11.0mm植入体模型;Abaqus有限元软件分别分析了在正咬合和反咬合关系条件下,在0°,30°,45°,60°,90°负载300N的同等加载下,其上颌窦区域的应力分布情况,并作了比较。结果与结论:在反咬合关系下,上颌骨内的应力集中均匀分布在牙植体颈部与皮质骨的交界处,在0°,30°,45°,60°,90°负载300N的同等加载下,Max von Mises分别是23.43,52.97,61.18,66.15,70.53MPa。在正咬合关系下,上颌骨内的应力集中不仅分布在牙植体颈部与皮质骨的交界处,而且出现了第二应力集中区,Max von Mises分别是38.64,71.22,71.62,77.65,73.21MPa,较反咬合平均高出50%左右。实验有限元分析结果表明,高度吸收上颌窦区采用反咬合设计方法更好。更多还原

【Abstract】 BACKGROUND: The finite element method has been widely used in orthopedic biomechanics analysis by evaluating Max von Mises stress and stress delivery and distribution. However, due to the complex biomechanics environment in the body and significant individual differences, it is difficult to obtain clinical methods based on specific cases. OBJECTIVE: To analyze the biomechanical distribution of implants in the maxillary sinus district. METHODS: An implant model, 5.5 mm×11.0 mm, located in the second molar of the maxillary was built using Simplant. The distribution of the stress of maxillary sinus district in the conditions of normal occlusion and crossbite under loading of 300 N at 0°, 30°, 45°, 60°, and 90°, respectively, was analyzed using Abaqus finite element software. RESULTS AND CONCLUSION: In crossbite condition, the concentration stress of von Mises was evenly distributed in the junction of the neck of dental implant and cortical bone; under the 300 N equivalent loading at 0°, 30°, 45°, 60°, and 90°, Max von Mises stress was 23.43, 52.97, 61.18, 66.15, and 70.53 MPa. In normal occlusion condition, the second stress concentration zone appeared in cortex in addition to the junction of the neck of dental implant and cortical bone, and Max von Mises stress was 30.91, 71.22, 71.62, 77.65, and 73.21 MPa under the 300N equivalent loading at 0°, 30°, 45°, 60° and 90°, about 50% higher compared with crossbite. Finite element analysis demonstrates that it is better to adopt crossbite in highly absorbed maxillary sinus district.更多还原