Objective: The objective of this study was to evaluate the influence of polyetheretherketone substructure and indirect composite resin veneering material thicknesses on stress distribution in endodontically treated maxillary premolar teeth restored with endocrowns. Methods: A sound maxillary premolar teeth was used as control group. Polyetheretherketone substructure and indirect composite resin veneering materials were used as endocrown materials in all study groups. The occlusal thicknesses of the endocrowns were fixed at 3 mm in study groups. Thicknesses of polyetheretherketone and indirect composite resin veneering material were determined as; 1, 1.5 and 2 mm. Stress distributions of maxillary premolar teeth under 200 N vertical and oblique loads were analyzed. Results: Von Mises stress distributions were same in study groups. Von Mises stress values in enamel and dentin were same in all study groups and they were higher than sound teeth. The lowest Von Mises in restorative material were found in a study group with 2 mm PEEK substructure and 1 mm indirect composite resin veneering material thickness. Conclusion: Difference in polyetheretherketone and indirect composite resin veneering materials’ thickness didn’t affect von Mises stress values and distributions in enamel, dentin.

Özyürek T, et al. Restor Dent Endod. 2017 Aug;42(3):224-231. https://doi.org/10.5395/rde.2017.42.3.224