Akademik Veri Yönetim Sistemi
Clinical Dentistry and Research, cilt.47, sa.2, ss.3-11, 2023 (Hakemli Dergi)
Background and Aims: The aim of this study was to evaluate the effect of distally tilted implant length on stress accumulation when evaluated by 3D finite element analysis. Materials and Methods: Four different finite element models were created according to the length of posterior implant. Models 1 and 2 had vertically placed implants, whereas models 3 and 4 had distally tilted posterior implants placed at a 30° angle with differing implant length. A titanium alloy milled framework with 15 mm cantilevers were placed with the implants. An oblique occlusal load of 200 N with 45° inclination was applied from the central fossa of the first molar. Maximum principal (Pmax) and minimum principal (Pmin) stresses were calculated for cortical and trabecular bones, and von Mises stress values were calculated for the implants, abutments, and prosthetic frameworks. Results: The highest Pmax and Pmin values in the cortical bone were found in model 4, whereas the lowest Pmax and Pmin values in the cortical bone were observed in model 2. The highest von Mises stress in implants was seen in model 1 (72.68 MPa), compared with the lowest value found in model 2 (30.68 MPa). Models 3 and 4 had similar von Mises stress values in implants (54.66 MPa and 56.74 MPa, respectively). The highest von Mises stress in abutments occurred in model 4 (82.26 MPa). Conclusions: The increasing length of distally tilted implant did not reduce the stress accumulation in the all-on-four treatment concept. Different prosthetic and surgical options should be considered to modify the stress distribution