非游离端可摘义齿与固定义齿牙槽骨承力的变形分析

Comparison of a fixed fixed bridge with casting clasp retained nonextention removable partial denture

目的：观察非游离端可摘义齿与固定义齿受载前后基牙牙槽骨的变形。方法：选用新鲜人尸离体上下颌骨，制备左下第一恒磨牙缺失模型，先后用铸造三臂卡环为固位体的可摘义齿及整铸双端固定桥对缺失区进行修复。以垂直向均匀加载和集中加载两种方式，用电子散斑干涉技术比较分析基牙牙槽骨受载前后的变形分布。结果：两种修复体都可以使基牙牙槽骨的离面位移减少，以固定修复后基牙牙槽骨的离面位移减少得较为显著。结论：两种设计都有其合理性。

Objectiive:To observe out of plane deformation on the surface of the alveolar bone around abutment with fixed fixed bridge or with casting clasp retained nonextention removable partial denture under loading.Method:A fresh human corpse mandible with the first left molar missed was chosen for test models.Two kinds of vertical static loading were exerted on the mandibular teeth before prosthesis and after prosthesis with a casting clasp retained nonextention removable partial denture or a casting cobalt chromium alloy fixed fixed bridge respectively. The displacement distribution in the alveolar bone was analysed with eelctronic speckle pattern interferometry (ESPI). Results:After these prosthesis,displacement distribution in alveolar bone around abutment was decreased significantly. Displacement of alveolar bone with a fixed fixed partial denture was less than that with a casting clasp retained nonextention removable partial denture. Conclussion:The two designs of denture structure were rational. The mechanical behaviors of alveolar bone were improved after prosthesis.A fixed fixed partial denture was better than casting clasp retained nonextention removable partial denture.