Effects of different ceramic and composite materials on stress distribution in inlay and onlay cavities: 3-D finite element analysis

Abstract

To reduce loss of tooth tissue and to improve esthetic results, inlay and onlay restorations are good treatment choices for extensive cavities in posterior teeth. The aim of this paper was to evaluate, by means of three-dimensional finite element analysis, the effects of restorative material and cavity design on stress distribution in the tooth structures and restorative materials. Two different nanofilled composites and two different all-ceramic materials were used in this study. A permanent molar tooth was modeled with enamel and dentin structures. 3-D inlay and onlay cavity designs were created. Von Mises, compressive, and tensile stresses on the restorative materials, core materials, enamel, and dentin were evaluated separately. On the effect of restorative material, results showed that in the case of materials with low elastic moduli, more stress was transferred to the tooth structures. Therefore, compared to the nanofilled composites, the all-ceramic inlay and onlay materials tested transferred less stress to the tooth structures. On the effect of cavity design, the onlay design was more efficacious in protecting the tooth structures than the inlay design.

A Comparative Study To Evaluate The Fracture Resistance of Posterior Teeth Restored With Ceramic Inlay And Hybrid Composite Restoration – An In-Vitro Study.

“…42 Therefore, adhesive restorations are useful to reinforce the tooth weaken by cavity preparation. 43 The findings of the present study are consistent with those of previous investigations 45,46,47 , which consider that acid etching and adhesive techniques do reinforce dental structure in a way that the stiffness values of restored teeth approximate the values of sound teeth. Ceramic inlays with 1/2 or 1/3 of the intercuspal distance, luted with resin cements, can recover tooth strength near that of intact teeth.…”

“…Therefore, compared to the nanofilled composites, the all ceramic inlay and onlay materials tested transferred less stress to the tooth structures. 43 Eackle et al . found in their study that fewer fractures occur in teeth if cavity preparation is conservative.…”

The mechanical properties of human dentin for 3-D finite element modeling – numerical and analytical evaluation

“…There are a few main mechanical parameters connected with the physical problems and qualities which can have a direct link to the obtained results, including dentin properties, which are usually assumed to be homogeneous, isotropic and linear elastic. [3][4][5][6][7] Expanding such a method into biomechanics requires a significant and continuous improvement of modeling techniques with respect to the individual anatomic and pathological characteristics of human tissues.…”

“…[1][2][3][4][5] The FEM enables the modeling of very complex structures (e.g. teeth) and gives an accurate description of the local strain and stress inside the non-homogenous material.…”

“…teeth) and gives an accurate description of the local strain and stress inside the non-homogenous material. [3][4][5][6] Depending on the research topic, finite element (FE) models in macro-, meso-and microscales can be used. 3,[7][8][9] However, FE models of the biological structure are usually performed using a simplified approach.…”