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首页> 外文期刊>The Journal of Prosthetic Dentistry >Mechanical behavior of ceramic veneer in zirconia-based restorations: a 3- dimensional finite element analysis using microcomputed tomography data.
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Mechanical behavior of ceramic veneer in zirconia-based restorations: a 3- dimensional finite element analysis using microcomputed tomography data.

机译：陶瓷单板在基于氧化锆的修复体中的力学行为：使用微计算机断层扫描数据进行的三维有限元分析。

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STATEMENT OF PROBLEM: The fracture or chipping of ceramic veneers is a common problem for zirconia-based restorations. PURPOSE: This study evaluated the stress distribution in the veneer of a maxillary central incisor restored with a complete crown using a zirconia core with a feldspathic ceramic veneer, simulating an incomplete bond between the veneer and zirconia substructure. MATERIAL AND METHODS: Based on a microcomputed tomography of a maxillary central incisor, 3 finite element models (M) for a complete crown were developed: Mf, a complete crown based on feldspathic ceramic; Mlz, a zirconia-based complete crown with a complete bond at the zirconia/veneer interface; and Mnzl, similar to Mlz, but with an incomplete bond at the zirconia/veneer interface created by using a contact element with a frictional coefficient of 0.3. A distributed load of 1 N was applied to the lingual surface at 45 degrees to the long axis of the tooth. RESULTS: The zirconia core in the Mnzl model showed peak stresses for maximum principal stress (sigma(max)) and shear stress of 9.02 and 8.81 MPa, respectively. The ceramic veneer in the Mnlz model showed peak stresses for sigma(max), minimum principal stress (compressive), and von Mises stresses of 5.4 MPa, 61.23 MPa, and 35.19 MPa, respectively. CONCLUSIONS: The incomplete bond increased the sigma(max) in the ceramic veneer in comparison to the perfect bond condition.
机译：问题陈述：陶瓷贴面的断裂或碎裂是基于氧化锆的修复体的常见问题。目的：本研究评估了使用长石质陶瓷饰面的氧化锆芯完成完整冠修复的上颌中切牙的饰面中应力分布，模拟了饰面与氧化锆下部结构之间的不完全结合。材料与方法：基于上颌中切牙的显微计算机断层扫描，开发了3个完整冠的有限元模型（M）：Mf，基于长石的陶瓷制成的完整冠; Mlz，一个基于氧化锆的完整表冠，在氧化锆/圆角界面处具有完整的键;和Mnzl，与Mlz类似，但在氧化锆/导气管界面处的粘结不完全，这是通过使用摩擦系数为0.3的接触元件产生的。将1 N的分布载荷施加到与牙齿长轴成45度角的舌侧表面。结果：Mnzl模型中的氧化锆核显示出最大主应力（sigma（max））和剪切应力分别为9.02和8.81 MPa的峰值应力。 Mnlz模型中的陶瓷贴面显示的峰值应力为sigma（max），最小主应力（压缩）和von Mises应力，分别为5.4 MPa，61.23 MPa和35.19 MPa。结论：与完全粘结条件相比，不完全粘结增加了陶瓷贴面的sigma（max）。

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