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Effect of preparation depth on stress distribution in premolars restored with MOD pressed ceramics inlays

机译：制备深度对MOD压制陶瓷嵌体修复的前磨牙应力分布的影响

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摘要

The elastic modulus of the material is an important property in the longevity of the dental restoration. Ideally, the elastic properties of restorative materials should be close to those of the tooth structure to yield a more uniform stress distribution. The elastic modulus of pressed ceramics is close to that of the enamel and this is an advantage as restorative material. The existing literature revealed no clear guidelines for all the cavity parameters. The aim of the study was to assess the influence of cavity preparation depth on failure risk of pressed ceramic MOD inlays by means of finite element analysis. 3D models of maxillary first premolars, prepared for MOD inlays with different depths of the horizontal cavity were generated (between 1.5 and 3.1 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 200 N was conducted, and stresses occurring in the pressed ceramics MOD inlays, and teeth structures were calculated. The study provides a biomechanical explanation for inlays restored teeth. MOD inlays transfer functional stress to the teeth structures. The highest stresses were registered in the enamel. It is important to avoid placing the margins of the preparations in the contact areas with the antagonists. The depth of the preparations had no significant influence on the stress values for the studied cases.
机译：材料的弹性模量是牙齿修复体寿命的重要特性。理想地，修复材料的弹性应接近牙齿结构的弹性，以产生更均匀的应力分布。压制陶瓷的弹性模量接近搪瓷的弹性模量，这是作为修复材料的优势。现有文献表明，没有关于所有型腔参数的明确指南。该研究的目的是通过有限元分析评估模腔准备深度对压制陶瓷MOD嵌体破坏风险的影响。生成了上颌第一前磨牙的3D模型，该模型针对具有不同水平腔深度的MOD嵌体（在1.5至3.1 mm之间）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200 N的咬合载荷，并计算在压制的陶瓷MOD镶嵌物中产生的应力，并计算牙齿的结构。该研究为镶嵌修复牙齿提供了生物力学解释。 MOD嵌体将功能应力传递到牙齿结构。瓷釉中的应力最高。重要的是要避免将制剂的边缘放在与拮抗剂接触的区域。制剂的深度对所研究病例的应力值无显着影响。

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