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铸造陶瓷的引进,引起了人们对全瓷冠的兴趣。一般认为前牙冠切缘磨除厚度为1.5～2mm,超过2mm易受较高的口内应力而折裂,但这种理论未被证实。本研究旨在验证加载的上颌前牙陶瓷冠其应力分布对切端瓷长度相对不敏感的假设。材料与方法设计了具有粘固层的二维有限元冠-牙模型,其切端瓷长度分别为1.0mm、1.9mm和4.0mm(Ⅰ、Ⅱ、Ⅲ试件)。有限元应力分析运用了SAP86和Microtab的计算机平面应力选择项编码,预备牙由397个节点,364个三角形四边形单元组成,底部
The introduction of foundry ceramics has aroused people's interest in all-ceramic crowns. Generally believed that the removal of the thickness of the anterior crown removal thickness of 1.5 ~ 2mm, more than 2mm vulnerable to higher intraoral stress and fracture, but this theory has not been confirmed. The purpose of this study is to verify the assumption that the stress distribution of the loaded maxillary anterior teeth ceramic crown is relatively insensitive to the length of the cut end porcelain. MATERIALS AND METHODS Two - dimensional finite element crown - tooth model with a cementing layer was designed. The length of porcelain was 1.0mm, 1.9mm and 4.0mm (Ⅰ, Ⅱ and Ⅲ). Finite element stress analysis was performed using computer plane stress selection codes for SAP86 and Microtab. The prepared tooth consisted of 397 nodes and 364 triangular tetragonal cells, with the bottom