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上中切牙铸造陶瓷全冠三维有限元分析

Three-dimensional finite element analysis of castable-ceramic crowns of the upper central incisor

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【作者】 赵云凤程碧焕高宁王华蓉

【Author】 Zhao Yunfeng,Cheng Bihuan,Gao Ning,et al.School of Stomatology,West China University of Medical Sciences.Chengdu 610041

【机构】 华西医科大学口腔医学院深圳口腔医疗中心

【摘要】 目的 分析上中切牙铸造陶瓷全冠不同颈缘形态的应力分布规律,为陶瓷全冠的临床应用提供依据。方法 采用三维有限元法。结果 瓷冠唇、舌侧颈缘有张应力、压应力集中;瓷冠表面应力> 冠内应力> 制备体应力;台肩型较凹面型陶瓷冠的应力值小。结论 临床制备陶瓷全冠时建议设计台肩型,冠颈缘厚度应在0 .5 ~1 .0m m 之间,冠表面应高度抛光,去除裂纹,以提高冠的抗折能力。

【Abstract】 Objective The purpose of thes study was to examine the effect of different cervical marginal shapes on rhe stress distribution of castable ceramic crowns of upper central incisor.Methods three-dimensional finite element analysis were used.Results The results showed that compressive stress and tensile stress concentration were observed at labial and lingual cervical parts of the ceramic crown;the stress at the surface of the crown was highest,the stress inside the crown was higher than that inside the prepared teeth;the shoulders stress value was lower than the chambers.The results provided theoretic foundation for clinical application of castable ceramic crown.Conclusion It suggested the shoulder design should be recommended in clinical practice when the castable ceramic crowns are planned;The cervical thickness of the crown should within 0.5 ~ 1.0 mm;the crowns surface should be polished well to improve its resistance to fracture.

【基金】 国家自然科学基金资助! 项目号39270728
  • 【文献出处】 现代口腔医学杂志 ,JOURNAL OF MODERN STOMATOLOGY , 编辑部邮箱 ,1999年04期
  • 【分类号】R783.3
  • 【被引频次】33
  • 【下载频次】63
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