Purpose: This experiment studied the influence of different connection designs of the tapered retention and platform transfer implant on the stress of the abutments and abutment screws.
Methods: Implant models (Platform-switching: 0.2, 0.4, 0.6, 0.8, 1.0 mm; Taper:6°,8°,10°) were established, and Von-mises stress and strain of abutment and abutment screw under different loads were analyzed.
Results: With the increase of the platform-switching amount, the peak von-Mises stress and strain of abutment and abutment screw increased. The peak von-Mises stress of the model with platform transfer≥0.8 mm was higher than 690 MPa. In addition, the variation amplitude was horizontal loading>oblique loading>vertical loading. The maximum stress of the abutment was concentrated at the neck of the abutment in 81.67% models. The stress of the abutment screw was concentrated at the turning point of the head and body of abutment screw in all models.
Conclusions: The increase of the amount of platform switching makes the abutment and the abutment screws bear more force in the occlusion process. Therefore, in order to reduce the occurrence of mechanical complications after implantation and restoration, the implant system with the minimum amount of platform transfer should be selected within a certain range. The maximum stress on the abutments and screws exceeds the yield strength of pure titanium in implants with platform-switching amount greater than 0.8 mm, indicating that this design should be selected prudently in clinical practice.