Basis And Clinic Studied On The Titanium Implant Structures Failure And Corrosion In Oral Cavity.

Titanium has become a material of great interest in prosthodontics in recent years. A growing trend involves the use of titanium as an economical and biocompatible replacement for existing alloys for fixed and removable prosthese. However, increased use of titanium in prosthodontics depends on research and clinical trials to compare its effectiveness, as an equivalent or superior metal, to existing metals.Since 1990s, there have been many problems to solve and understand in implant prosthodontics.(1) It is often found not to be sufficiently stable under loading condition to withstand fretting, so that titanium implant structure failure and function losing efficacy;(2) The use of wrought metal components in patterns that are subsequently placed in investments for casting procedures is common to be nondental industry,where these components are called cast inserts. This strategy is used in dental implant prosthetics to provide the prostheses of porcelain and control of the fitting frameworks used for screw retentions. It is necessary to study the interfaces between the titanium cylinders and the titauium alloys, noble and no—noble dental metals; (3) Under static conditions, titanium is a corrosion—resistant material due to the oxide film formed on the surface. It is often found to be resistant to pitting and crevice corrosion. However, the film might not be sufficently stable under loading conditions to withstand galling and seizing. Titanium implant structures have shown corrosion in the spacil active service oral cavity.The evolution of titanium applications to medical and dental implants has dramatically increased in the past few years because of titanium's excellent properties in nondental industry. However, how to dialectical recongnize the titanium implant complications and to overcome in oral cavity, it is important for the titanium and titanium alloys to get a step further useness in prosthodontics. So that, (1) we have made use of the scanning elctron microscopy and energy dispersive spectroscopy to analyse the failure specimens that took from the clinical titanium implant structures.(2) the interfaces produced by standard lost wax procedures that use titanium implant cylinders with high— fusing no—noble metal cast alloys were evaluated with scanning electron microscopy, energy dispersive spectroscopy and vicker's hardness values evaluation.(3) the work to be...