COMPARATIVE ANALYSIS OF ENDURANCE CEMENTS FOR THE FIXATION OF NON-REMOVABLE ORTHOPEDIC CONSTRUCTIONS UNDER THE ACTION OF CYCLIC COMPRESSION.

OBJECTIVE: The aim: To conduct studies of the physical and mechanical properties of cements for fixation, namely the duration of cement samples under cyclic compression. PATIENTS AND METHODS: Materials and methods: We have conducted a study of 6 cements for permanent fixation of fixed structures of dentures. To study the duration of cements under cyclic compression, a special stand was used, which allows testing samples for cyclic compression with a load frequency of 5.4 Hz or 324 cycles per minute and an increase in compression in a cycle from 10 to 100 kg/s. RESULTS: Results: Comparative analysis of the mechanical properties in compression of dental cements for permanent fixation showed that the obtained deformation curves differ significantly in each of the cement samples used in the study. CONCLUSION: Conclusions: The results of the study of the physical and mechanical properties of cements indicate that the most optimal complex of properties is possessed by the zincphosphate cement Unitsem and glass ionomer cements Cemion and Fuji I. This is most clearly confirmed when studying the duration of cement samples under cyclic compression, which simulates a real situation.

ANALYSIS OF THE ADVISABILITY OF USING DIFFERENT TYPES OF BASE PLASTICS BY STUDYING THE NEEDS OF THE POPULATION IN REMOVABLE PROSTHESIS.

OBJECTIVE: The aim: To determine the needs of the population of the Ternopil region in prosthetics with removable orthopedic dentures and to study the physical and technological properties of different types of base plastics. PATIENTS AND METHODS: Materials and methods: The needs of Ternopil and Ternopil region population in removable prosthetics were studied on the basis of consolidated annual reports of city and district dental clinics of Ternopil region. Base dental plastics «Ftoraks¼ (Stoma, Ukraine) and «Villacryl H Plus¼ (Zermapol, Poland) were used to study the physical and mechanical properties (deformations during compression and tension). RESULTS: Results: As a result of our research, we found that the need of the Ternopil region population for removable prosthetics is quite high. When analyzing the choice of designs of removable laminar prostheses, it was found that 64.99 ± 0.14% of patients required the manufacture of partial removable dentures, and 35.01 ± 0.18% - complete removable dentures. A significant difference was found in the physical and technical characteristics of the samples of the studied plastics, which were polymerized by various methods. CONCLUSION: Conclusions: Dental base plastic «Villacryl H Plus¼, which was packaged and polymerized by casting, has significantly higher physical and mechanical properties than dental base plastic «Ftoraks¼.