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目的:探讨分裂式设计与RPI设计制作的钴铬合金铸造支架RPD修复KennedyⅠ类缺损对支持组织应力分布的影响,为优化义齿设计提供实验依据。方法:分别以分裂式设计和RPI设计两种设计形式的钴铬合金铸造支架RPD修复下颌牙双侧游离缺失,用三维光弹应力冻结切片技术测试义齿加载后对基牙和缺牙区牙槽骨的应力分布,并加以分析比较。结果:钴铬合金分裂式设计的铸造支架RPD承受压力沿基牙牙体长轴传导,基牙远中所受扭力较小。结论:对于KennedyⅠ类牙列缺损,钴铬合金分裂式设计的铸造支架RPD使支持组织受力均匀、合理,减小了基牙受到的扭力,达到基牙保护的目的,是一种值得推广的设计。
OBJECTIVE: To investigate the effect of splitting design and RPD casting cobalt-chromium alloy cast-iron stent RPD on the stress distribution of Kennedy class I defect, and to provide experimental evidence for optimizing denture design. Methods: Two types of cobalt-chromium alloy casting brackets, RPD, were designed respectively by split design and RPI design to repair the bilateral free deletion of mandibular teeth. Three-dimensional photoelastic stress-free frozen section technique was used to test the effects of denture loading on abutment and edentulous alveolus Bone stress distribution, and to analyze and compare. Results: The RPD of split cast cobalt-chromium alloy was conductive under the pressure of the long axis of abutment tooth, and the torsional force of abutment was relatively small. Conclusion: For Kennedy Ⅰ dentition defect, the cast-iron stent RPD split by cobalt-chromium alloy can make the supporting tissue evenly and rationally, reduce the torsion force of the abutment, and achieve the purpose of protecting the abutments. It is worth to be popularized design.