The aim of this finite element study was to analyze effect of supporting implants inclination on stress distribution in the bone for a four-unit fixed partial denture. A three-dimensional finite element model of mandibular molar section of the bone to receive implants was constructed. Three implant-supported fixed partial dentures, with null, moderate and wide tilting, of 0°, 15° and 30° implant inclinations, respectively, were modeled. A mechanical load of 10 MPa was applied in coronal–apical direction on bridge framework at the regions of crowns positions. The finite element analysis was performed, and von Mises stress levels were calculated. Peak stress concentration in the cortical bone was observed mostly around the implant necks, in inter-implants line. There was favorable stress distribution during loading, with peak stress being 90.04 MPa for 0°, which decreased to 54.33 MPa for 15° and 46.36 MPa for 30° inclination. The supporting implants inclination in fixed partial denture plays an important role in stress distribution and may be helpful in preventing bone loss and implant failure. This phenomenon is likely to be more pronounced in bones of poor quality. Within the limitation of this study, it seems that the inclination of implants in fixed partial denture has a favorable effect on stress distribution pattern values around the supporting implants.

本有限元研究的目的是分析支撑种植体倾斜度对四单元固定局部义齿骨中应力分布的影响。构建了用于接收种植体的下颌磨牙截面的三维有限元模型。模拟了三个种植体支持的固定局部义齿，分别具有 0°、15° 和 30° 种植体倾角的零倾斜、中等倾斜和宽倾斜。10 MPa 的机械载荷被施加在牙冠位置区域的牙桥框架上的冠状-心尖方向。进行了有限元分析，并计算了 von Mises 应力水平。在种植体间线中，主要在种植体颈部周围观察到皮质骨中的峰值应力集中。加载过程中应力分布良好，峰值应力为90。0°时为 04 MPa，15°时降至 54.33 MPa，30° 时降至 46.36 MPa。固定局部义齿中的支撑种植体倾斜度在应力分布中起着重要作用，可能有助于防止骨质流失和种植体失败。这种现象在质量较差的骨骼中可能更为明显。在本研究的限制内，固定局部义齿中种植体的倾斜似乎对支撑种植体周围的应力分布模式值有有利影响。