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The article considers the taxonomic composition and the population level of the oral cavity microbiota and changes in their characteristics after prosthetic rehabilitation with partial removable dentures. In the patients with partial loss of teeth wearing conventional removable dentures, the taxonomic composition of the gingiva microbiota changes due to the biotope contamination with opportunistic S. aureus and yeast-like fungi of the Candida genus, S. haemolyticus, K. pneumoniae, enterobacteria (E.coli, K.pneumoniae, E.cloacae), B.catarralis, M.lacunata and partial elimination of S. sialivarius, S.sanguis, S. mutans, S. mitis from the biota.  The objective of the research was to study changes in the gingiva in the examined patients.  Materials and Methods. Microbiological (bacteriological and mycotic) examination of gum mucus secretion in the patients with partial loss of teeth was performed. The control group consisted of 50 (23 men and 27 women) patients without any infectious and noncommunicable diseases, who had no problems adapting to removable denture during the last 6 months.  Results and Discussion. In 78.72% of the patients, microorganisms isolated and identified from the surface of the prosthetic bed, were in associations that consisted of 2 (31.70%), 3 (8.51%) and 4 (8.51 %) taxons. The most numerous associations consisting of 2 taxons were: S. aureus and M. lacunata; S. aureus and N. flavescens; S. haemolyticus and B.catarrhalis as well as C. albicans and S. epidermidis. In the biotope (the surface of the gum mucosa of the prosthetic bed) of the patients wearing partial removable laminar dentures, the population level reduced in S. salivarius, S. sanguis, S. mutans, S. mitis and significantly increased in opportunistic staphylococci (S. aureus, S. haemolyties, S. epidermidis), S. pyogenes, enterobacteria (E. coli, K. pneumoniae, E. clocacae), B.catarrhalis. Microorganisms S. aureus and C. albicans reached a high population level; it increased in S. haemoliticus, S. epidermidis, S. pyogenes, E. coli, E. cloacae, K. pneumoniae as well.  Conclusions. In the patients with partial loss of teeth wearing conventional removable dentures, the taxonomic composition of the gingiva microbiota changed due to the contamination of the habitat with opportunistic S. aureus and yeast-like fungi of the Candida genus, S. haemolyticus, K. pneumoniae, enterobacteria (E .coli, K. pneumoniae, E. cloacae), B. catarralis, M. lacunata and partial elimination of S. sialivarius, S.sanguis, S. mutans, S. mitis from the biota.

Taxonomic Composition and Population Level of the Prosthetic Bed Mucosa Microbiota in Case of Dentition Defects in Patients Wearing Partial Dentures