Comparative assessment of milled materials for temporary unremovable dentures supported by the isoelastic implants according to the experimental study of their stress-strain states and microbial adhesion

The aim of the research is the choice of the optimal material for temporary unremovable dentures supported by the isoelastic implants. The objectives of the research are to study the stress-strain state of structures consisting of milled temporary dentures on isoelastic implants by finite element method and to make a comparative assessment of microbial adhesion to the materials for long-term temporary unremovable dentures in vitro. We made the model of temporary bridges from three units: supporting first premolar, second premolar, supporting first molar. We examined different supporting elements’ combinations of crestal implants, basal implants and natural tooth. We compared three temporary bridges’ materials. We used the standard technique for assessing primary adhesion in vitro with ultrasonic action to study the microbiological properties of materials. Analysis of the data shows that the stress distribution in crowns is practically independent of the properties of the studied temporary bridges’ materials. The areas of maximum stress occur in the intraosseous part of implants in all studied cases. The adhesion of microorganisms is less to samples of Russian material Nolatech compared with samples from foreign analogues: Dentokeep PEEK and Temp Basic. Polished Nolatech showes lower rates of microbial adhesion of all studied representatives of microbial flora, than varnished one.