Prevention of destruction to noble alloy ceramic metal dentures

For a long time the main structural material for fixed dental prostheses were cobalt and Nickel-chrome alloys, which were covered in ceramic coatings. However, due to the environmental degradation increases as the number of complaints of allergic reactions, adverse reactions in the oral cavity, deterioration of the General condition of the body, frequent exacerbations of chronic diseases. In this regard, more and more widely used alloys of noble metals, because they have an exceptional combination of high-tech unique properties and biocompatibility. Dental technicians often use in their work sprues that according to some authors can strongly affect the physical and mechanical properties. To study the maximum number of sprues that can be added to the new pellets, without the risk of breakage of the prosthesis, we have investigated changes in physico-mechanical properties (thermal linear expansion factor, yield strength in bending, hardness) and chemical composition of the samples of noble national dental alloysfor the manufacture ofmetal-ceramic dental prostheses. The data obtained allow to conclude that dentures made of precious alloys during casting of the frames which adds 50% of the sprues, the basic composition and properties correspond dentures made of new granules. Dentures, frames which are made from 100% sprues are significant differences in physico-mechanical properties from the source material. Thus, it is possible to recommend the use of 100% of the sprues data noble alloys for the manufacture of inlays, all-metal, metal-composite or polymeric denture, since the addition of sprues, in this case, will not affect the risk of breakage of the frame.

metal-ceramic dental prosthesis, noble alloy, quantity of recasting