不同咬合状态下上颌中切牙全瓷冠修复的有限元分析  

Finite element analysis of maxillary central incisor all-ceramic crowns in different occlusal states

作　　者：肖严[1] 熊康[2] 权菲菲 

机构地区：[1]湖北职业技术学院医学院,湖北省孝感市432100 [2]江汉大学附属第二医院口腔科,湖北省武汉市430050 [3]孝感口腔医院牙体牙髓科,湖北省孝感市432000

出　　处：《中国组织工程研究》2016年第12期1806-1811,共6页Chinese Journal of Tissue Engineering Research

摘　　要：背景:影响全瓷冠强度的因素很多,研究不同颈缘形态、切端厚度、黏合剂及轴壁聚合度对全瓷冠强度影响的研究较多,对于不同咬合关系对全瓷冠影响的研究较少。目的:通过三维有限元分析不同咬合关系对全瓷冠修复的影响。方法:建立上颌中切牙全瓷冠三维有限元模型,全瓷冠材料分别选用EmpressⅡ与In-Ceram Zirconia,在正常覆牙合位置和深覆牙合位置上分别施加外力载荷230 N,与牙长轴成45°夹角,分析不同咬合关系时内部应力和边缘应力的分布。结果与结论:(1)不同咬合关系下同种全瓷冠修复的应力分布:深覆牙合时,牙骨质、牙槽骨和牙周膜的应力峰值较正常覆牙合时低,全瓷冠和黏合剂的应力峰值较正常覆牙合时高。深覆牙合时,EmpressⅡ修复组牙本质应力峰值较正常覆牙合时高,In-Ceram Zirconia修复组牙本质应力峰值较正常覆牙合时低。不同全瓷冠材料不影响应力分布区域,深覆牙合时应力主要集中在咬合接触区,正常覆牙合时应力主要集中在咬合接触区和唇侧颈缘。(2)相同咬合关系下不同全瓷冠修复的应力分布:应力峰值在正常覆牙合时受材料影响不明显,在深覆牙合时受材料影响较大。全瓷冠材料对牙骨质、牙槽骨和牙周膜的应力峰值无太大影响,对全瓷冠的应力峰值有一定影响,但差别不明显。全瓷冠材料对黏合剂和牙本质的应力峰值影响比较明显,EmpressⅡ修复组黏合剂和牙本质的应力峰值较大,In-Ceram Zirconia修复组黏合剂和牙本质的应力峰值较小。BACKGROUND： The strength of all-ceramic crowns is affected by many factors. At present there are many studies concerning the neck edge shape, cutting thickness, binder and convergence angle, but little has been reported on the effects of different occlusions on all-ceramic crowns. OBJECTIVE： To explore the maxillary central incisor all-ceramic crowns in different occlusal states by finite element analysis. METHODS： Three-dimensional finite element models of the maxillary central incisor all-ceramic crowns were established. Empress II and In-Ceram Zirconia were selected. The normal overbite position and deep overbite position were applied to force a load of 230 N, with the long axis of the tooth at a 45° angle. Distribution of inner stress and edge stress was analyzed at different occlusal states. RESULTS AND CONCLUSION：（1） The stress distribution of all-ceramic crowns under different occlusion relationship was different. The stress peaks of cementum, alveolar bone and periodontium in the deep overbite were lower than those in the normal overbite. The stress peaks of all-ceramic crowns and binder were higher than in the deep overbite than the normal overbite. The stress peak of the dentin in the Empress II group was higher in the deep overbite than in the normal overbite. The stress peak of the dentin in the In-Ceram Zirconia group was lower in the deep overbite than in the normal overbite. Different all-ceramic crowns had no influence on the stress distribution, but in the deep overbite, the stress was mainly concentrated in the occlusal contact area, and in the normal overbite, the stress was mainly concentrated in the occlusal contact area and at the labial cervical margin.（2） The stress distribution of different all-ceramic crowns under the same occlusal state was different. In the normal overbite, different all-ceramic crowns had no evident influence on the stress peak, and in the deep overbite, there was a certain effect of different all-ceramic crowns on the stress peak, but there was no si

关 键 词：牙修复体 咬合力 有限元分析 组织工程 生物材料 口腔生物材料 全瓷冠 修复 上颌 中切牙 咬合 

分 类 号：R318[医药卫生—生物医学工程]