Aim:
To compare the adhesive ability of resident and transient representatives of the oral cavity microflora to various base materials used for the manufacture of removable dentures.

Material and methods:
The presented report is an experimental study in vitro. 3 types of base materials, namely Vertex, Breflex and Villacryl were used in order to evaluate the adhesive ability of microorganisms. Strains of opportunistic pathogens representing the facultative anaerobic transient microflora of the oral cavity were used for the research. After the cultures cultivation, the number of isolated colonies grown from the microbial cells that adhered to the material sample was counted.

Results:
Staphylococci adhered to all tested samples of base materials very weakly. Adhesion of methicillin-sensitive S. aureus ( to Villacryl was at the level of the control material, i.e. glass (adhesion indices constituted 0.58 and 0.64). It was significantly weaker in relation to Breflex (adhesion index was 0.47) and, especially, to Vertex (adhesion index was 0.39). All materials demonstrated adhesion indices lower than glass for α-hemolytic streptococci and staphylococci. Adhesion indices of Breflex and Villacryl resin for β-hemolytic streptococci differed little from the corresponding values ​​of glass.

Conclusions:
All tested samples of base materials showed significant biological inertness: the adhesion indices of the vast majority of the tested microorganisms were lower than those of the control material. Oral streptococci showed the weakest adhesive ability to Villacryl (average values of adhesion indices 0.51 and 0.68 appropriately). Staphylococci and Candida yeast-like fungi showed a weak adhesive ability to the samples of base materials, especially to Vertex.