ACRYLIC AND POLYPROPYLENE REMOVABLE DENTURES AND THE RESULTS OF COMPARATIVE STUDIES OF THEIR PHYSICALAND MECHANICAL PROPERTIES

Abstract

Taking into account the urgency of improving removable prosthetics (especially prostheses made of modern materials nylon, polypropylene, acetal) in modern orthopedic dentistry, the author set the goal to eliminate the disadvantages of polypropylene prostheses in order to reduce the complications that accompany removable plate prosthetics by studying and improving the physical-mechanical and physical-technological properties of polypropylene. The comparison group consisted of acrylic base plastics. Various modifications of polypropylene and the copolymer "Tipplene R 359" developed by the author, which has a number of advantages over other analogues, were studied. To improve a number of properties of the copolymer "Tipplene R 359" after polymerization and fitting of the prosthesis, it was treated in glow discharge plasma. The results of physical and chemical studies of polypropylene and acrylic plastics convincingly prove that these materials are devoid of the main disadvantages of acrylic base materials, namely: they have a high degree of chemical safety, increased strength characteristics; they are characterized by low shrinkage, which ensures high accuracy of prostheses, as well as insignificant water absorption, which ensures their high hygiene. However, the main disadvantage of polypropylene prostheses is the porosity of their surface, which leads to changes in the surface of prostheses with a long period of use.