Purpose: The aim of the present study was to investigate the influence of three post-and-core

systems and two crown materials on stresses in restored premolars using Finite Element

Analysis (FEA). Materials and Methods: A maxillary second premolar 3D model was created

in SolidWorks 2014 (Dassault Systémés). Severe loss of tooth structure was simulated with

six restorative options: 1) glass-fiber-reinforced composite post and composite core

(GFRC)+CAD/CAM leucite-reinforced glass-ceramic crown (LRC); 2) carbon-fiberreinforced

composite post and composite core (CFRC)+LRC; 3) metal cast post-and-core

(MPC)+LRC 4) GFRC+CAD/CAM composite resin crown (CC); 5) CFRC+CC; 6)

MPC+CC. Three-point occlusal loading (150N) was simulated and von Misses and maximum

principal stresses calculated. Results: Although maximum von Mises stresses in the crown

and dentin were similar across groups (137.9-139.2MPa crown; 17.2-19.6 dentin), there were

important differences in stress distribution in dentin. Only in MPC+CC group the maximum

stresses were on the bottom of the post preparation cavity. Stress values within the posts

were: CFRC(4.8MPa)>GFRC(6.7MPa)>MPC(10.3MPa). CC-restored models presented

higher von Mises stresses within the post-and-core compared to the LRC groups. Maximum

principal stresses were lower compared to von Mises stresses, following the same trend, and

were distributed similarly in all the groups. Conclusions: Both GFRC and CFRC showed

favourable stresses distribution in the dentin and restorative materials, while MPC increased

stresses in core, post and post cement. The more rigid crown material seems to transmit less

stresses to the underlying core and crown cement compared to CC.