An alloy of Co − Ni − Mo − Cr is prepared by diffusion impregnation with chromium from point sources of cobalt-nickel-molybdenum alloy powder synthesized by combined reduction. Optimum regimes are determined for preparing alloy powder by combined reduction of cobalt, nickel, and molybdenum oxides (reduction temperature 1325 K, isothermal soaking time 3 h) and diffusion impregnation with chromium (temperature 1373 K, isothermal soaking time 4 h). The adhesive strength of a facing coating with material of a dental prosthesis manufactured using the alloy developed is studied. It is shown that with application of retention layers the adhesive strength increases by a factor of three to five compared with using cast spheres (beads).Material science developments are often used in medicine. In orthopaedic stomatology there is quite extensive use of powder metallurgy production methods in preparing dental prostheses: article formation from plastic or metalplastic, sintering (annealing) of ceramics and cermets, deposition of powder coatings and others. Here a whole range of composite materials is used, including powder materials [1][2][3].In view of the use of cermet and metal-plastic fixed dental prostheses it is important to improve the method for joining a facing coating with the metal body of the crown. The joint strength of the metal body and the plastic facing material, that is provided in traditional methods of dental prosthesis making by the use of cast spheres (beads), adhesives, etching agents, retention elements in the form of saw cuts, overhangs, do not always satisfy the intended requirements [4]. The relatively large overall wall thickness of traditionally faced metal-plastic and cermet crowns (1.5-2.0 mm) induces stomatologists to prepare a considerable amount of hard dental tissue that from a medical point of view is very undesirable.To some extent this problem may be solved by using powder materials and gas-thermal methods (plasma, gasplasma) for coating deposition. Plasma deposition of coatings is used most often [5]. In this technology there are almost no limitations for the material from which a coating is applied, and also the shape and size of the metal, ceramic, gypsum, or plastic surfaces being coated. Here with use of starting powders with different properties it is possible over wide limits to vary the roughness of the deposited surface and adhesion between the body of crown and facing material.The joint strength of a deposited (retention) coating with the substrate, for example with the metal body of a dental prosthesis, forms due to mechanical gripping of particles of the deposited material with specially prepared rough
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