骨质量对上颌窦提升术后植入种植体稳定性影响的三维有限元分析

The impact of bone quality on implant stability after maxillary sinus augmentation: A 3-D finite element analysis

目的 :探讨骨质量对上颌窦提升术后上颌后牙区种植体稳定性的影响。方法 :建立简化的上颌后牙区颌骨模型,将颌骨设定为D2、D3、D4 3类骨质,每种类型的颌骨又分为上颌窦提升术后使用植入物组及无处理组。将种植体与颌骨模型装配,并在其顶部中心节点加载大小为150 N的斜向应力,分析周围骨组织内部的应力分布。结果:颈周皮质骨是主要的应力集中区域,随着骨质量的下降,骨种植体界面的应力最大值升高,使用植入物可明显减小应力负载。结论:骨质量与骨组织内应力水平密切相关,使用植入物可有效改善因较差骨质导致的应力过载。

PURPOSE： To evaluate the impact of bone quality on implant stability. METHODS： Simplified posterior maxillary segment models were established and classified them into three types of bone quality： D2, D3 and D4. Each type of maxilla was treated with or without bone grafts. The implant was assembled into the maxilla. An oblique force of 150 N was applied to the central node in the top surface of implant. The stress distribution pattern of surrounding bone was analyzed by 3-D finite element method. RESULTS： The stress was mainly concentrated on the cortical bone around the implant neck. The magnitude of stress in surrounding bone increased following the deterioration of bone quality and decreased with the help of grafts. CONCLUSIONS： Bone quality was closely related to the magnitude of stress in bone tissue and bone graft can improve the overload caused by poor bone quality.