Akademik Veri Yönetim Sistemi
Journal of Meffert Implant Institute, cilt.5, sa.1, ss.1-3, 2021 (Düzenli olarak gerçekleştirilen hakemli kongrenin bildiri kitabı)
Introduction: Implant restorations may need to be removed in case of mechanical and biological complications or renewal of the restorations. For this purpose, the combined cement- and screw-retained implant-supported restorations have gained increasing interest in implant dentistry because they combine the advantages of cemented and screw-retained restorations to a great extent and reduce their disadvantages. The purpose of this study was the comparative biomechanical evaluation of combined cement- and screw-retained implant-supported metal-ceramic, zirconia, and monolithic zirconia restorations using the 3D finite element stress method. Materials and Methods: In the study, 3 jawbone models were prepared. Dense cortical bone (2 mm) and thick trabecular bone type below, which is seen 50% in the posterior region of the mandible, were modeled and the material properties of these bone types were defined. Titanium implants with a diameter of 4 mm and a length of 10 mm were placed on these jaw models. Then, metal-ceramic, zirconia, and monolithic zirconia restorations were modeled on the placed implants. Considering the worst-case scenario, an average occlusion force of 100 N was applied obliquely (30° to the x, y, and z axes) in the distal triangular fossa of the crowns. As a result of the study, the stress distributions and values obtained in the implant components and periimplant tissues were analyzed and interpreted. Results: It is observed that the stresses occurring in the bone, restoration, implant, and implant components occur below the durability level of the structures. In addition, stress values and distributions in metal-ceramic, zirconia, and monolithic zirconia models were similar. Discussion & Conclusion: Metal-ceramic, zirconia, and monolithic restorations can be used safely in a combined cement and screw-retained implant-supported system. Keywords: Combined cement- and screw-retained implant-supported restoration, 3-dimensional finite element analysis, metal-ceramic, zirconia, monolithic zirconia,