Three-dimensional finite element analysis of effect of prosthetic materials and short implant biomechanics on D4 bone under immediate loading

Abstract

Aim: The aim of the study is to evaluate the influence of maxillary cortical bone thickness (CBT) and crown prosthesis on stress distribution at bone bone-implant interface in single immediately loaded short and wide wide-diameter implants. Materials and Methods: A three dimensional finite element model of a maxillary posterior section of bone (Type 4) with CBT of 0.5 mm was used in this study. Dental implant of length 7 mm length and diameter 5 mm diameter was modeled and inserted into maxillary models. Porcelain fused to metal (PFM) and acrylics were used for crown prosthesis. A total average occlusal force of 100 N was applied at the central pit of the crown in oblique (15° to the vertical) direction buccolingually. Results: The micro micro-movements and Von Mises stresses were found to be lower for PFM crown than for acrylic crown on the short implant. Conclusion: The peri-implant stresses on the cortical bone were reduced for PFM crown. Short and wide implant can be placed in D4 bone quality with thin CBT under immediately loading protocol using PFM crowns.