<i>In vitro</i>/<i>in silico</i> investigation of failure criteria to predict flexural strength of composite resins

Abstract

The aim of this study was to investigate a failure criterion to predict flexural strengths of composite resins (CR) by three-dimensional finite element analysis (3D-FEA). Models of flexural strength for test specimens of CR and rods comprising a three-point loading were designed. Calculation of Young's moduli and Poisson's ratios of CR were conducted using a modified McGee-McCullough model. Using the experimental CR, flexural strengths were measured by three-point bending tests with crosshead speed 1.0 mm/min and compared with the values determined by in silico analysis. The flexural strengths of experimental CR calculated using the maximum principal strain significantly correlated with those obtained in silico amongst the four types of failure criteria applied. The in silico analytical model established in this study was found to be effective to predict the flexural strengths of CR incorporating various silica filler contents by maximum principal strain.

Influence of hydrolysis degradation of silane coupling agents on mechanical performance of CAD/CAM resin composites: <i>In silico</i> multi-scale analysis

“…Instead of in vitro models, in silico three-dimensional finite-element analysis has been used to predict the properties of resin composite materials, such as resin properties with various filler contents 17) or filler sizes 18) . Yamaguchi et al have confirmed that predicted flexural strengths by in silico analysis was significantly correlated to those obtained by in vitro tests 19) . By using nanoscale properties of CAD/CAM RCB components, including the mechanical properties of silica fillers and resin matrices, macroproperties, such as the elastic modulus and Poisson's ratio of the CAD/CAM RCB can be predicted by homogenization analysis 18,20) .…”

“…The MPS that was used in this study has been reported as a failure criterion to predict flexural strengths for resin composites 19) . All maximum MPS values that were obtained by localization analysis were observed at a hydrolysis layer that excluded the 100% silane coupling model, which suggests that fracture initiation may occur at the location hydrolysis of the silane coupling agents.…”

“…By using nanoscale properties of CAD/CAM RCB components, including the mechanical properties of silica fillers and resin matrices, macroproperties, such as the elastic modulus and Poisson's ratio of the CAD/CAM RCB can be predicted by homogenization analysis 18,20) . When a force is added to the CAD/CAM RCB at a macroscale, the strain and stress distribution of the CAD/CAM RCB, including the maximum principal strain (MPS), which is known as the failure criteria of composite materials 19,21) at a certain nanoscale area can be analyzed by localization analysis. By in silico multi-scale analysis, which is an in silico technique that combines homogenization and localization analysis, the mechanical properties of CAD/ CAM RCB under various conditions can be investigated.…”

Fluorinated Montmorillonite and 3YSZ as the Inorganic Fillers in Fluoride-Releasing and Rechargeable Dental Composition Resin

“…where σt is the tensile stress, P is the load at fracture, π is ratio of the circumference of a circle to its diameter, D is the diameter, and T is the thickness. Flexural strength tests were performed according to the ISO 4049 standard [35]. The cross-sectional area of the samples was 4 mm 2 (sample size: length, 24 mm; height, 2 mm; width, 2 mm).…”

Finite element simulation of fixed dental prostheses made from PMMA —Part II: Material modeling and nonlinear finite element analysis

“…Although FEA is applied within numerous dental investigations, there are only few studies available in this field in which FEA results are compared with real validation experiments 11,12) . Furthermore, FEA is only used in academic research fields and not in daily dental practice under clinically closed conditions.…”