不同咬合状态下上颌中切牙全瓷冠修复的有限元分析
发布时间:2018-11-08 12:53
【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。
[Abstract]:Background: there are many factors affecting the strength of all-ceramic crowns. The influence of different neck shape, cutting end thickness, adhesive and axial wall polymerization degree on the strength of all-ceramic crowns is studied, but the influence of different occlusal relationships on all-ceramic crowns is less studied. Objective: to analyze the effect of different occlusal relationships on the restoration of all-ceramic crowns by three-dimensional finite element method. Methods: a three-dimensional finite element model of maxillary central incisor all-ceramic crowns was established. Empress 鈪,
本文编号:2318563
[Abstract]:Background: there are many factors affecting the strength of all-ceramic crowns. The influence of different neck shape, cutting end thickness, adhesive and axial wall polymerization degree on the strength of all-ceramic crowns is studied, but the influence of different occlusal relationships on all-ceramic crowns is less studied. Objective: to analyze the effect of different occlusal relationships on the restoration of all-ceramic crowns by three-dimensional finite element method. Methods: a three-dimensional finite element model of maxillary central incisor all-ceramic crowns was established. Empress 鈪,
本文编号:2318563
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