上海交通大学学报（医学版）

›› 2010, Vol. 30 ›› Issue (4): 423-.

• 论著（基础研究） • 上一篇    下一篇

聚缩醛树脂义齿修复KennedyⅡ类牙列缺损的生物力学研究

焦 婷1, Tingling Chang2, Angelo A. Caputo3   

  1. 1. 上海交通大学 医学院第九人民医院口腔修复科 上海市口腔医学重点实验室, 上海 200011；2. Division of Advanced Prosthodontic, Biomaterial, University of California-Los Angeles, Los Angeles 90095-1668, USA；3. Biomaterials Science Section, Division of Advanced Prosthodontics, Biomaterials, and Hospital Dentistry, UCLA School of Dentistry, Los Angeles 90095, USA
  • 出版日期:2010-04-25 发布日期:2010-04-26
  • 作者简介:焦 婷（1972—）, 女, 副主任医师；电子信箱: jiao_ting@hotmail.com。

Study on biomechanics of Kennedy class Ⅱ removable partial denture with polyacetal resin

JIAO Ting1, Tingling Chang2, Angelo A.Caputo3   

  1. 1. Department of Prosthodontics, Shanghai Key Laboratory of Stomatology, The Ninth People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200011, China；2. Division of Advanced Prosthodontic, Biomaterial, University of California-Los Angeles, Los Angeles 90095-1668, USA；3. Biomaterials Science Section, Division of Advanced Prosthodontics, Biomaterials, and Hospital Dentistry, UCLA School of Dentistry, Los Angeles 90095, USA
  • Online:2010-04-25 Published:2010-04-26

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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Kennedy Ⅱ类牙列缺损的生物力学。方法 建立下颌Kennedy Ⅱ类牙列缺损（76-6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Kennedy Ⅱ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。

关键词: 聚缩醛树脂义齿, 光弹模型, 生物力学, 可摘局部义齿

Abstract:

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 Ⅱ 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.

Key words: polyacetal resin denture, photoelastic model, biomechanics, removable partial denture