Cristian Drochioi, Petrica-Florin Sava, Stefan Gherasimescu,Norina Forna, Igor Blanaru, Victor Vlad Costan
DOI : 10.62610/RJOR.2025.2.17.46
ABSTRACT
Aim of study was to evaluate the stress, displacements and deformation in the peri-implant alveolar bone and prosthetic components in mandibular implant-supported hybrid prostheses. Materials and Method.. This finite element analysis (FEA) study modeled a 3D maxillary edentulous section based on CT data from a 65-year-old patient. Four models of implant-supported removable hybrid prostheses were created, combining two implants with retention bars and various degree of alveolar bone resorption on both quadrants (1-1 mm; 2-2 mm; 3-3 mm; 4-4 mm). Bilateral mastication was simulated by applyincg static vertical forces (100 N) on the first molar region. Linear static analysis was conducted using Ansys Workbench 2017 to assess von Mises stress distribution in the bone–implant interface and prosthetic components under different loading and configuration scenarios. Results. The highest von Mises stress occurred in cortical bone (20.5 MPa) and the implant–Ti bar interface (55.15 MPa) in the 4-4 mm model, while the lowest were in cancellous bone (0.58 MPa) and displacement (0.00119 mm) in the 1-1 mm model. Conclusions. As bone resorption increased, higher stress concentrations and mechanical demands were observed in the cortical and cancellous bone, at the implant–Ti bar interface, and within the acrylic saddle structure. These results emphasize the importance of preserving alveolar bone volume to maintain favorable stress distribution and prosthetic performance. In patients with advanced resorption, special attention should be given to implant positioning, prosthetic design, and material selection in order to mitigate the risk of biomechanical complications.
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