Akademik Veri Yönetim Sistemi
ANNALS OF CLINICAL AND ANALYTICAL MEDICINE, cilt.14, sa.4, ss.358-364, 2023 (ESCI)
Aim: Peri-implant complications can result in a process that includes implant removal and is related to anatomical conditions, implant design, remaining peri-implant bone and defect type, and bone quality. The aim of this study was to assess how different implant geometries and thread designs in different peri-implant bone defect types under a removal torque value could affect the stress distributions in the implants and surrounding bone employing finite element analysis (FEA). Material and Methods: Four different designs (Type-I: external hexagonal-cylindrical; Type-II: internal hexagonal-root form; Type-III: internal conical-cylindrical; Type-IV: Internal conical-root form) placed in the maxillary and mandibular posterior region with D2 and D3 type bone with three peri-implant bone defect models or as a control, fully osseointegrated dental implants were evaluated using the 3D-FEA method. The application of a reverse torque force of 10 Ncm to implants has been examined by comparing the stress distributions of the maximum principle and the minimum principle. Results: The stress transmitted to the cortical bone in the neck region was found to be higher than to the cancellous bone. Circular-type bone defects had an increasing trend for stress values towards the apical region. Type II and Type IV implants demonstrated the highest von Mises stress values in peri-implant defect models, especially on buccal sites. Discussion: In the presence of horizontal and circular bone defects, the implant surface reached higher stress values in 2/3 coronal sites remarkably for the root-form implants during implant removal. Reaching high-stress values in the buccal area has marked the critical importance of buccal bone preservation during implant removal procedures.