模拟口腔应力环境下钴铬烤瓷冠颈缘的优化设计  

Optimization design of cobalt chromium PFM crown neck flange under simulated oral stress environment

作　　者：王宁[1] 聂蓉蓉[1] 荣亮[1] 钱冬冬[1] 

机构地区：[1]南京大学医学院附属口腔医院,南京市口腔医院修复科,江苏南京210008

出　　处：《口腔医学》2016年第12期1074-1077,共4页Stomatology

基　　金：国家自然科学基金青年项目(31301207)

摘　　要：目的研究钴铬烤瓷冠唇侧颈缘不同材料、不同肩台设计在不同应力情况下唇侧颈部的应力分布规律,以期为钴铬烤瓷冠唇侧瓷颈缘设计在临床的应用提供一定的理论依据。方法采用三维有限元法结合Mico-CT对上颌中切牙进行计算机模拟,分析钴铬烤瓷冠唇侧颈缘不同材料、不同肩台设计形态在两种不同受力情况下的应力分布情况。结果钴铬烤瓷冠瓷颈缘颈部的应力与金属颈缘颈部的应力差异很小,均在瓷的许用应力强度范围之内,120°浅凹形肩台更有利于保护牙体组织。结论钴铬烤瓷冠瓷颈缘结合120°浅凹形肩台可承受正常的咬合力,临床上瓷颈缘可能是钴铬烤瓷冠的一种选择。Objective To study the stress distribution rule on the cervical margin of porcelain-fused-to-metal crown（PFM） under two work conditions when two kinds of materials and two designed margins are adopted. Methods The 3-D finite element method was used to perform the computer analog of the maxillary central incisor,and the stress distribution was analyzed on the cervical margin of PFM crown under two work conditions when two kinds of materials and two different designs were adopted. Results The stress on the cervical margin of PFM crown when the ceramic cervical margin was used was very close to that when the metal cervical margin was used,the stress was much lower than the permissible stress strength of ceramic. 120 degree bevel proved more beneficial for protecting the tooth health. Conclusion Under the normal occlusal force,the cervical margin ceramic of porcelain-fused-to-metal crown is not liable to fracture and can be a choice in clinical practice.

关 键 词：应力分析 烤瓷冠 颈缘 肩台 

分 类 号：R783.2[医药卫生—口腔医学]