Stress distribution in carbon-post applied with different composite core materials: a three-dimensional finite element analysis

The aim of this study was to investigate, using three-dimensional nite element analysis [3D-FEA], the stress and/or strain distribution of ve di erent resin composites used in combination with carbon bre posts. FEA models of ve di erent light-cured composites were employed. The stress distribution of composite in combination with carbon bre post was analysed under two di erent loading conditions: (i) polymerization shrinkage and (ii) load of 150 N with a 35° tilt to the long axis of the tooth. The Material Fatigue Rate [MFR%] of composite materials, dentin and bre post was calculated. The highest stress values were recorded for Heliomolar and Clear l-Photo P. The lowest stresses and MFR% values were attained when using Diamond Crown. High MFR% value [>45%] for carbon posts were found in all the tested cases under load. Composite materials with a Young’s modulus similar to that of dentin should be selected for the restoration of endodontically-treated teeth when using carbon bre posts. The peak of the polymerization stress of the composite core is localized at the ferrule level. This might induce an open margin with higher risk of coronal leakage.