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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.
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    Öğe
    Use of Patient's Natural Tooth as a Provisional for Immediate Loading of a Single Implant in the Maxillary Central Region: A Case Report
    (Akdeniz Üniversitesi, 2025) Dilber, Erhan; Atalay, Yusuf
    In patients with dental trauma resulting in root fractures but intact crowns, immediate implant placement with temporary loading of the natural tooth can be performed. This approach not only restores aesthetics and promotes gingival contouring but also provides psychological benefits to the patient. This case report describes the management of a patient with a fractured upper right central incisor due to intraoral trauma, involving immediate implant placement followed by temporary and subsequent permanent loading.