Comparative Evaluation of the Fracture Resistance and Marginal Adaptation of Endodontically Treated Teeth Restored with Different Prosthodontic Techniques: A Clinical and In Vitro Study

Background: Endodontically treated teeth (ETT) are biomechanically compromised and more prone to fracture. Choosing the appropriate post-endodontic prosthodontic restoration is crucial for long-term success. Aim: To compare the fracture resistance and marginal adaptation of ETT restored using three different prosthodontic techniques: full-coverage crowns with fiber post-core, endocrowns, and indirect onlays. Materials and Methods: Thirty extracted mandibular molars were endodontically treated and randomly assigned into three groups (n=10). Group A received fiber post and full-coverage crown restorations; Group B, endocrowns; Group C, indirect composite onlays. Fracture resistance was tested using a universal testing machine. Marginal adaptation was analyzed via dye penetration and stereomicroscopy. Results: Group B (endocrowns) showed the highest fracture resistance and lowest microleakage, followed by Group A, then Group C. Statistical analysis revealed significant differences between the groups (p<0.05). Conclusion: Endocrowns demonstrated superior mechanical and marginal integrity. They may be considered a reliable alternative to traditional crown and post systems in posterior ETT.