Yeni Vida Tutuculu Abutment Sistemlerine Simante Edilen İmplant Destekli Zirkonya Restorasyonların Biyomekanik Davranışları: Üç Boyutlu Sonlu Elemanlar Analiz Çalışması

Abstract

Objective: The purpose of this study was to evaluate the biomechanical behaviors of non-engaging titanium base abutments (NTiBA) bonded to three-unit zirconia restorations in terms of stress distribution in implants and prosthetic components. Material and Methods: Three-dimensional (3D) models of a tissue-level and bonelevel implant systems and their screw-retained abutments (SRA) and NTiBA were created. A bone block representing the maxillary right posterior region was created, and the implants were placed in the first premolar and first molar areas. Six different three-unit implant-supported fixed dental prostheses (I-FDPs) models were created: tissuelevel implant, N-TiBA, 6 mm crown height (TL6); tissue-level implant, N-TiBA, 10 mm crown height (TL10); bone-level implant, SRA, 6 mm crown height (SR6); bone-level implant, SRA, 10 mm crown height (SR10); bone-level implant, N-TiBA, 6 mm crown height (BL6); bonelevel implant, N-TiBA, 10 mm crown height (BL10). The restoration material was determined as monolithic zirconia. In each model, equal vertical (200 N) and oblique (100 N) loads were applied to each tooth simultaneously. The stress distribution in the restoration, implant, abutments, and basal screws was evaluated through the von Mises stres analysis. Results: The TL6 and TL10 exhibited higher von Mises stres values in the implants and lower von Mises stress values in the abutments than in the other FEA models. The increase in the crown height resulted in higher stress values under oblique loading compared to vertical loading. Conclusion: The non-engaging connection type and crown height affected the stress distribution in the implant and prosthetic components.