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    A Comparative Study on the Fracture Resistance of CAD/CAM-Fabricated Single-Piece Post-Crowns
    (Wiley, 2025) Erdem, Ali; Bilgin, Mehmet Selim; Ersoy, Ibrahim; Dilber, Erhan; Isik, Ebru Nur; Eyuboglu, Tan Firat; Ozcan, Mutlu
    Objectives: Recently, CAD/CAM materials have become popular in dental clinics; however, information about their fracture resistance as post-crowns remains limited. This study compared the initial fracture resistance of potential single-piece post-crown materials made with CAD/CAM milling to sound teeth. Materials and Methods: Fifty freshly extracted, non-carious human central incisor teeth underwent endodontic treatment. The roots were then randomly divided into five groups based on the post systems: the control group included teeth filled only with gutta-percha. Monoblock post-crowns were made using four different systems for the other groups: LDS (IPS e.max CAD (R), lithium disilicate glass-ceramic), YTZP (inCoris ZI (R), Yttrium tetragonal zirconia polycrystal), RNC (Lava Ultimate (R), resin-based nanoceramic), and PICN (VITA Enamic (R), polymer-infiltrated ceramic network). The post-crowns were cemented with resin cement and tested with a universal testing machine at a crosshead speed of 1.0 mm/min. Data analysis used one-way ANOVA and multiple comparison post-hoc Tukey tests (alpha = 0.05). Results: Significant differences were found between the groups (p < 0.001). The control group exhibited the highest fracture resistance (749.25 +/- 225.02 N). YTZP showed similar resistance to the control (p = 0.99) and LDS (447.28 +/- 168.72 N, p = 0.081), but was significantly higher than RNC (343.79 +/- 157.08 N, p = 0.0051) and PICN (348.78 +/- 157.44 N, p = 0.0059). LDS, RNC, and PICN did not differ significantly. YTZP experienced more non-repairable fractures (5/10), while PICN predominantly failed in a repairable manner (9/10). Conclusions: All CAD/CAM post-crowns exceeded functional loads for the anterior region. YTZP and LDS demonstrated greater strength, whereas PICN and RNC, despite being weaker, favored repairable failures-highlighting the importance of balancing strength and clinical manageability.