The influence of the connector position placing, cement thickness and load direction on biomechanical performance of implant supported mesial cantilever: Finite element analysis

Abstract

Background/purpose Implant-supported cantilevers crowns (ISCCs) can be a viable alternative to avoid surgical adjunctive procedures when replacing missing teeth. The connector position placing (CPP) is crucial and can be adjusted to optimize the biomechanics which important to decision for long term success of treatment. The aim of this study was to investigate the biomechanical performance of ISCCs with different CPPs design, cement thickness and load directions. Materials and methods Three-dimensional finite element clinical simulating models of ISCCs in posterior mandible were fabricated. Twelve clinical simulating models consisted of three CPPs, two cement thickness (30 and 60 microns) and two load directions (axial and oblique) were investigated. The finite element analysis was performed, and the stress of implant, prosthesis and periodontal ligament, strain of the bone, and displacement of teeth were recorded and analyzed. Results All clinical simulating models, oblique loads can cause more significant biomechanical performance compared to axial loads. The CPPs design significantly influences the biomechanical performance of ISCCs. It found that the mesial CPP (MCPP) experienced lower levels of bone strains compared to regular CPP (RCPP) and distal CPP (DCPP). The cement thickness is generally considered to have a minor impact compared to other factors. Conclusion In biomechanical point of view, the CPPs design influences the biomechanical performance of ISCCs. The MCPP is considered biomechanically more advantageous especially in terms of reducing strain on the surrounding bone. Clinicians should carefully consider this factor to ensure optimal biomechanical performance and minimize the risk of biomechanical complications.