Aim: The aim of this study is to evaluate the effect of different implant angulations under different crown materials on surrounding bone stress distribution using finite element.
Methods: Two simplified models were prepared for molar crown supported by implant placed vertically and tilted 25° in simplified mandibular bone geometry. Geometric models' components were prepared on Autodesk Inventor then assembled in ANSYS for finite element analysis. Each model was subjected to two loading cases as 150N compressive load at central fossa and 50N oblique load at mesio-buccal cusp tip.
Results: The values of total deformations and Von Mises stresses showed minor difference when changing load position and angle. On the other hand, crown and cement were considerably affected by crown material selection. Also, results showed insensitivity of mucosa, implant complex, cortical and cancellous bone to changing crown material.
Conclusion: It was found that the implant complex and bone are showing jump in values of stresses and deformations by changing implant angle and/or loading position and angle. While, crown and cement stresses decreased with decreasing crown material rigidity leading to better load distribution at bone implant interface. Implant fixture, mucosa, cortical and cancellous bone were not sensitive to crown material.