肩台瓷长度对金瓷冠应力的影响  

The influences of shoulder porcelain length on the stress distribution of metal-ceramic crowns

作　　者：刘亦洪[1] 韩科[2] 刘莉[3] 许承东[3] 

机构地区：[1]北京大学口腔医学院综合科,100081 [2]北京大学口腔医学院修复科,100081 [3]北京理工大学机电工程学院

出　　处：《中华口腔医学杂志》2003年第2期119-122,共4页Chinese Journal of Stomatology

摘　　要：目的　分析不同肩台瓷长度对金瓷冠应力分布的影响。方法　设计 1 8个模型 ,利用二维有限元分析法计算在 9种加载条件下 ,各模型瓷层、粘接层及牙体组织层的拉应力、压应力、剪切应力及Von Mises应力。结果　 3种龈缘牙体预备形态时 ,肩台瓷长度对金瓷冠应力值分布均无明显影响。结论　基底冠唇侧边缘短于预备体龈缘的设计没有影响全瓷颈缘的强度 ,临床可以将短于预备体龈缘 1～Objective To analyze the stress distribution induced by simulated intra oral loads on ceramometal crowns with different length of shoulder porcelain in labial margins Methods Eighteen two dimensional finite element models of the maxillary central incisor restored with ceramometal crowns were constructed which were designed with different labial terminal locations of metal coping Different coping alloys and marginal designs were employed in the crown models The stresses of porcelain veneers and adhesive layers in all models were estimated with different loading locations and angles Results Although coping alloys and marginal designs were different, the labial terminal locations of metal coping had no influence on the stress distribution of porcelain veneers and adhesive layers Conclusion The coping design of short labial margin to add the length of shoulder porcelain of ceramometal restorations can be used clinically

关 键 词：牙科陶瓷 牙冠 应力 有限元分析 前牙修复 牙体预备 全瓷颈缘 

分 类 号：R783[医药卫生—口腔医学]