Федеральное государственное автономное образовательное учреждение высшего образования «Белгородский государственный национальный исследовательский университет», Белгород, Россия

In the oral cavity, mechanical loading and exposure to temperature leads to deformation of the frameworks of fixed prostheses and lining materials ensuring the proper level of their aesthetics. The increase of the isotropy of the material of the framework of a fixed prosthesis and the material that is facing it is one of the urgent problems in the field of orthopedic dentistry. In this paper, the linear thermal expansion coefficients (LTEC) of the facing materials “Ceramage Opaque Dentin”, “Ceramage Incisal”, produced by the Japanese company “Shofu”, and those of “UltraGlass” of the Russian firm “VladMiVa” were studied. The values of LTEC of facing materials were correlated with LTEC of cobalt-chromium alloy, used for making the frameworks of fixed prostheses. A comparative evaluation of the compressive strength, flexural strength, and modulus of elasticity of the specified composite materials used for facing the frameworks of fixed prostheses was also carried out.

The combined influence of a family and a state plays an important role in the development of an individual. This study is aimed at the model effectiveness evaluation concerning the development of oral hygiene skills among children living in families (n = 218) and being under the care of a state (n = 229). The groups were created among the children who took part in the study: the preschoolers of 5-7 years, schoolchildren of 8-11 years and adolescents of 12-15 years. During the initial examination, the hygienic status of the oral cavity before and after tooth brushing was evaluated. After that, subgroups were formed in each age group according to three models of hygienic skills training: 1) computer presentation lesson; 2) one of the students acted as a demonstrator of the skill; 3) an individual training by a hygienist.During the next 48 hours children did not take hygienic measures. Then the children were invited for a control session to demonstrate the acquired skills of oral care and evaluate the effectiveness of a model developing the skills of individual oral hygiene. During the control examination, the hygienic status was determined before and after the tooth cleaning, which allowed to determine the regimes of hygienic measure performance for children with different social status and the effectiveness of hygiene training models.