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Heat pressed ceramics crowns with and without zirconia framework - a biomechanical study

机译：带和不带氧化锆骨架的热压陶瓷冠-生物力学研究

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The patient demand for metal-free and tooth-colored restorations has driven substantial effort to increase the strength and reliability of dental ceramic systems. Heat pressed ceramic crowns with and without zirconia frameworks are restorations of choice from this point of view. Simulation of occlusal function during laboratory material's testing becomes essential in predicting long-term performance before clinical usage. The aim of the study was to assess the influence of chamfer preparation depth on failure risk of heat pressed ceramic crowns with and without zirconia framework by means of finite element analysis. 3D models of maxillary first premolars, prepared for MOD inlays with different depths of the chamfer preparations were generated (between 0.6 and 1.3 mm). The mesh structure of the solid 3D model was created using the computational simulation of Ansys finite element analysis software. An occlusal load of 100 N was conducted, and stresses occurring in the prepared teeth, pressed ceramic crowns, zirconia frameworks and pressed ceramic veneers were calculated. The highest stresses were registered in the pressed ceramics. The depth of the preparations had no significant influence on the stress values of the teeth and pressed ceramics for the studied cases, only for the zirconia framework. Stresses in teeth were not influenced by achieving of zirconia frameworks of pressed ceramic crowns.
机译：病人对无金属和牙齿有色修复物的需求推动了为增加牙科陶瓷系统的强度和可靠性而付出的巨大努力。从这个角度来看，有或没有氧化锆骨架的热压陶瓷冠都是修复的选择。在实验室材料测试期间模拟咬合功能对于预测临床使用前的长期性能至关重要。该研究的目的是通过有限元分析评估倒角准备深度对带有或不带有氧化锆骨架的热压陶瓷冠的失效风险的影响。生成了上颌第一前磨牙的3D模型，该模型针对不同深度的倒角准备工作（介于0.6到1.3 mm之间）的MOD嵌体进行了准备。使用Ansys有限元分析软件的计算仿真来创建实体3D模型的网格结构。进行100 N的咬合载荷，并计算在制备的牙齿，压制的陶瓷牙冠，氧化锆骨架和压制的陶瓷薄板中产生的应力。最高压力记录在压制陶瓷中。在研究的情况下，制剂的深度对牙齿和压制陶瓷的应力值没有显着影响，仅对氧化锆骨架而言。牙齿的应力不受压制陶瓷冠的氧化锆骨架的影响。

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