Mechanics Analysis Of Dental Implant System With Platform Switching Structure

With the outstanding advantages of the implant denture, the implant restoration has been improved dramatically in the recent decades, and more and more patients prefer to choose this new prosthodontics. Most of the studies have shown multi-year success rate is very high for implants placed in patients. However implant failures were reported occasionally, including the implant fracture, loose, till the falling off. And one of the main causes of implant failure is excessive load on the interface of implant and bone caused by stress centralizing, which induces the absorption of the bone around implant. To maximize the chance for long-term implant stability and function, the design and selection of dental implant should base on better biomechanics compatibility and better biocompatibility.In this study, taking Dentium planting system with platform switching structure of Korea as a reference,(implants size 4mm×10mm),draw three-dimensional model which contains the corresponding base station, the central screw and porcelain crown through 3D mapping software of PRO/E Wildfire 5.0. Using Ansys Workbench14.0 mechanics analysis to the model.The research content of this paper:(1) To evaluate the influence of five different thread shape of implant on the stress distribution of implant-bone interface,and search for the best thread shape design. (2) To evaluate the influence of eight different pitch of implant on the stress distribution of implant-bone interface,and search for the best pitch design.(3) To compare the influence of different implant diameter and length on the stress distribution of implant-bone interface.(4) To compare the stress distribution and deformation distribution of different crown root ratio on platform shift structure system components and the surrounding bone tissue.(5) The analysis of fatigue life on implant-abutment system.The research conclusion of this paper: Triangular shape and isosceles trapezoid thread shape slightly better than other shapes;The impact of implant thread pitch on implant-bone interface stress distribution and deformation distribution is very small; As the implant diameter and length increase, the stress and deformation distribution becomes uniform; Compared with the length, the diameter of the change on implant-bone interface stress and deformation distribution influence is greater; Crown root ratio greater than 1:1 fully also has the possibility of successful cultivation, but try to avoid more than 2:1;The stress concentrations of the surrounding bone tissue of implant is reduced by the platform switching structure.but the risk that the loosen and fracture may be occurred in the base station and central screw will be increased. Jaw bone stress mainly comes from the bite force. Bolt pre-tightening force produces jaw stress is small.