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Biomechanical analysis on platform switching: is there any biomechanical rationale?
Yoshinobu Maeda1, Jiro Miura, Ikuro Taki
1Division for Interdisciplinary Dentistry, Osaka University Faculty of Dentistry, Osaka, Japan. ymaeda@dent.osaka-u.ac.jp
Objectives:
The purpose of this study was to examine the biomechanical advantages of platform switching using three-dimensional (3D) finite element models.
Material And Methods:
3D finite element models simulating an external hex implant (4 x 15 mm) and the surrounding bone were constructed. One model was the simulation of a 4 mm diameter abutment connection and the other was the simulation of a narrower 3.25 mm diameter abutment connection, assuming a platform-switching configuration.
Results:
The stress level in the cervical bone area at the implant was greatly reduced when the narrow diameter abutment was connected compared with the regular-sized one.
Conclusion:
Within the limitations of this study, it was suggested that the platform switching configuration has the biomechanical advantage of shifting the stress concentration area away from the cervical bone-implant interface. It also has the disadvantage of increasing stress in the abutment or abutment screw.
