Background: Implant manufacturers have produced different implant designs to reduce the stresses around the implant and supporting bone tissue. The present study was conducted with the objective aim to compare the stress distribution levels which occur around two different types of dental implants with two different restorative materials as superstructures as cantilever FPDs. Material and methods: The present study was carried out to compare the two different restoration materials and two different implant designs of implant-supported fixed cantilevered prosthesis. Three-dimensional finite element models of a 3-unit cantilever bridge were subjected to 150 N occlusal loads over functional cusps to evaluate the prosthetic materials and implant designs. A NextEngine 3D scanner was used to scan all structures of implants. Results: In the present study, when loading on implants with metal porcelain restorations, the maximum stresses were observed at the cortical bone (15.01 N/mm 2 ) around the cylinder implant adjacent to the cantilever. While the highest stress concentrations were observed at the cancellous bone in metal porcelain implants(5.657 N/mm2 ) with cylinder implants. When loading on implants with metal porcelain restorations, the maximum stresses were observed at the cortical bone (11.03 N/mm 2 ) around the cylinder implants with microthreads. While the highest stress concentrations were observed at the cancellous bone in fiber reinforced implants(3.67 N/mm2 ) with cylinder implants with microthreads. Conclusion: Our study concluded that that fiber reinforced composite (FRC) bear less stress than conventional metal porcelain.
Keywords: fiber reinforced, fixed cantilevered prosthesis, metal porcelain.