Biomechanical evaluation of platform switching in different implant protocols: computed tomography-based three-dimensional finite element analysis.

摘要: Purpose:To evaluate the influence of platform switching on biomechanical environment implants in different placement and loading protocols. Materials Methods:A computed tomography‐based finite element model a maxillary central incisor extraction socket was constructed containing conical 13-mm external-hex implant with 4.3-mm-diameter shoulder. Abutment models that were 4.3 mm 3.8 diameter then imported aligned to implant. The 4.3-mm abutment edge matched perfectly shoulder, while 3.8-mm assumed platformswitching configuration. Then, immediately placed, loaded, osseointegrated (ie, conventional delayed loaded) protocols simulated. Analysis variance used interpret data for peak equivalent strain (EQV strain) bone, bone-to-implant relative displacement, von Mises stress stress) screw, implant-abutment gap. Results: In same clinical situation, differences values assessed results minor abutments diameters. addition, no statistically significant seen any evaluated parameters, except although this observed rather low percentage. Nevertheless, slightly higher EQV screw all cases 3.8-mm-diameter abutment, not significant. Conclusion:Within limitation analysis, it can be concluded circumferential horizontal mismatch 0.5 does make an important contribution implants. Also, there seems drawback design rationale reducing move gap area away from implant-bone interface. INT J ORAL MAXILLOFAC IMPLANTS 2010;25:911‐919