Biomechanical Study On Implant-supported With Implant-natural Tooth Fixed Bridge

With the maturation of osseointegration theories and the improvement of implant materials, the success rate of implant rehabilitation has been improved, but implant failures were reported occasionally, including the fracture, loose, till the falling off. The one of main causes of implant failure is high load caused by stress centralizing, and the excessive loads on the interface of implant and bone, which induce the absorption of bone around implant. Meanwhile, in the different mandible model,whether the stress distribution on interface is reasonable or not will influence the formation and maintenance of osseointegration interface directly, then influence the success rate and long-term effect of implant-supported prostheses.In this study ,the stress distribution of mandible of implant-natrual tooth fixed bridge with precision attachment was studied and analyzed by means of three-dimensional finite element when different loading was applied.The first section applies 3-D reconstruction technology to build 3-D solid model of dental tissue. Appling the method of CT image processing and according to screw CT (Philips Mx8000) applied by department of malocclusion, second hospital of JLU, it has been builded by using the CAD software of SolidWorks2003. The concrete step is as follows:(1) Choose the position of CT fault scans. The basic principle of seat firstly to choose CT's fault scanning should be: Not to lose, and does not distort the shape form structure size information of living things structures, and try best to reduce the section number, and pay attention to sampling arrives footstep, sharp and part top, part key seats such as bottom, maximum diameter place and minimal diameter place, as well as some transition seats, etc.