Comparative Analysis of Internal and External-Hex Crown Connection Systems - A Finite Element Study

has reduced stress concentrations in the ABSTRACT crown. However, because the torque is transferred through the abutment screw to the abutObjectives: The abutment connection with ment contact, changing the torque has greater the crown is fundamental to the structural effect on this hex system than the masticatory stabil ity of the implant system and to the preforce. Overall the masticatory force is more vention of mechanical exertion that can cominfluential on the stress within the crown for promise the success of the implant treatment. the external-hex system and the torque is more The aim of this study is to clarify the difference influential on the internal-hex system. in the stress distribution patterns between implants with internal and external-hex connections with the crown using the Finite Element Method (FEM). Material and Methods: The internal and external-hex connections of the Neoss and 3i implant systems respectively, are