摘要
目的利用光弹模型研究聚缩醛树脂义齿(隐形义齿)修复KennedyⅡ类牙列缺损的生物力学。方法建立下颌KennedyⅡ类牙列缺损((?)缺失)光弹模型,分别设计和制作聚缩醛树脂全隐形义齿、混合型隐形义齿和传统的金属支架可摘局部义齿。模拟双侧及单侧后牙加载,观察加载时三种义齿设计基牙和缺牙区牙槽嵴的载荷光弹图像,分别记录应力分布情况并加以分析和比较。结果三种义齿设计光弹模型应力分布分析显示,在单侧和双侧加载时,全隐形义齿基牙和缺牙区牙槽嵴承受压力最大,传统的金属支架可摘局部义齿(金属支架设计)承受压力沿基牙牙体长轴传导,基牙和剩余牙槽嵴承受压力最小且分布最均匀。结论对于KennedyⅡ类牙列缺损,全隐形义齿修复对基牙和剩余牙槽嵴损伤较大;而传统的金属支架可摘局部义齿使支持组织受力均匀、合理,应作为设计的首选。
Objective To evaluate the biomechanics of Kennedy class Ⅱ removable partial denture with polyacetal resin as the major connector utilizing photoelastic model. Methods Mandible photoelastic model was established to simulate the partial edentulous （ （76｜6） edentulous） situation of Kennedy class Ⅱ Removable partial dentures with three kinds of major connector designs （polyacetal resin, metal framework and hybrid of metal and polyacetal resin） were fabricated. Stress was loaded on the posterior teeth bilaterally and unilaterally for each of the design. Stress patterns of the roots and alveolar bone were pictured and evaluated. Results On both bilateral and unilateral load, the polyacetal removable partial denture exhibited the highest stress both on the abutment teeth and on the edentulous alveolar ridge. The traditional metal framework removable partial denture design exhibited the lowest and well-distributed stress both on the abutment teeth and on the alveolar ridge, and the stress transferred to the abutments though the long axel of teeth. Conclusion Among Kennedy class fl removable partial dentures, the removable partial denture design with polyacetal resin as major connector may injure the abutment and alveolar ridge, while the traditional metal framework design exhibits the best stress pattern and should be considered as the first choice.
出处
《上海交通大学学报（医学版）》
CAS
CSCD
北大核心
2010年第4期423-427,共5页
Journal of Shanghai Jiao tong University:Medical Science
关键词
聚缩醛树脂义齿
光弹模型
生物力学
可摘局部义齿
polyacetal resin denture
photoelastic model
biomechanics
removable partial denture
