Effect of Restorative Material on Mechanical Response of Provisional Endocrowns: A 3D—FEA Study

Abstract

The goal of this study was to evaluate the stress distribution in an endocrown restoration according to different provisional restorative materials. An endodontically treated maxillary molar model was selected for conducting the finite element analysis (FEA), with a determined amount of dental remnant of 1.5 mm. The model was imported to the analysis software (ANSYS 19.2, ANSYS Inc., Houston, TX, USA) in STEP format. All contacts were considered perfectly bonded. The mechanical properties of each structure were considered isotropic, linear, elastic, and homogeneous. Three different provisional restorative materials were simulated (acrylic resin, bis-acrylic resin, and resin composite). An axial load (300 N) was applied at the occlusal surface in the center of the restoration. Results were determined by colorimetric stress maps of maximum principal stress, maximum shear stress, and total deformation. The different materials influenced the stress distribution for all structures; the higher the material’s elastic modulus, the lower the stress magnitude on the cement layer. In the present study, all provisional restorative materials showed similar stress patterns in the endocrown and on the cement layer however, with different magnitude. Based on this study limitation, the use of resin composite to manufacture provisional endocrowns is suggested as a promising material to reduce the stresses in the cement layer and in the dental tissue surfaces.

Influence of occlusal anatomy on acrylic resin CAD/CAM crowns fracture load and stress distribution.

“…The explanation for the worst biomechanical behavior for the Young design is because the cusps of posterior teeth substantial increased the bending and flexural loads during functional and parafunctional occlusal movements. These applied loads can theoretically generate a horizontal force component which tends to open up the principal sulcus space increasing the tensile stress concentration and subsequent creating cracks at the bottom of the fissure [22,23]. The present study corroborates with this statement since the numerical simulation showed an increased stress magnitude when the Young anatomy was used.…”

“…A previous finite element study suggest that the cusp angle can modify the loads incidence for provisional endocrowns restored molars [23]. The same indication can be performed for the present study considering only the fracture load and stress concentration for acrylic resin crowns.…”

Influence of Polymeric Restorative Materials on the Stress Distribution in Posterior Fixed Partial Dentures: 3D Finite Element Analysis

“…In addition, the digital process provides not only upgrades in the available dental materials but also a more precise final restoration [3]. The major advantage of CAD/CAM provisional materials is its industrial manufacture, reducing defect incorporation in the material bulk in comparison with the manual technique [4][5][6][7].…”

Stress Concentration of Endodontically Treated Molars Restored with Transfixed Glass Fiber Post: 3D-Finite Element Analysis

“…The interfaces in all models were considered perfectly bonded. Table 1 [ 20 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] summarizes the mechanical properties (elastic modulus and Poisson ratio) used for the mechanical analysis. An average of 156,252 nodes and 128,242 tetrahedral, ten nodes, elements were used for the meshing process after a convergence test with a 10% degree of freedom of the converged value and mesh size, based on the maximum principal stress (MPS) results.…”