ASSESSING THE EFFECT OF ULTRAVIOLET RADIATION ON THE MUCOSAL MICROBIOTA OF THE ALVEOLAR PROCESSES IN PATIENTS BEFORE DENTAL IMPLANTATION

Abstract

Peri-implantitis is one of the most common complications during dental implant installation, occuring in 10-20% cases.  The main cause for such complication is the production of biofilms by bacteria colonizing the implant placement area. The triggering factor for this is dysbiosis of the commensal oral flora. Studies show that Streptococcus spp. in association with Rothia spp., Neisseria spp., Corynebacterium spp. is normally found in healthy peri-implant sulcus However, in some cases Streptococcus spp. are indicator microbiota representatives in developing peri-implantitis. Ultraviolet radiation (UV) has been actively used in dental manipulations. The aim of the study was to analyze changes in the mucosa microbiota composition in alveolar processes of the upper and lower jaws upon exposure to UV radiation. Biopsies of mucosa collected from 35 patients, applied for dental implantation, were examined. Two mucosal samples were obtained from each patient. One of either sample was treated with a "Solnyshko" UV irradiator, the second sample remained intact. As a result of the study, 60 species of microorganisms were identified divided into the following groups: the group of constant microbiota, additional microbiota, transient microbiota. The constant microbiota for both samples before and after UV treatment consisted of two Streptococcus species: S. oralis and S. mitis. After UV irradiation S. vestibularis and S. salivarius were moved into the group of additional microbiota, and N. subflava became part of constant microbiota. The widest diversity of microorganisms was found in the transient microbiota. The average number of microbial species per sample changed from 9 ± 3 (M ± SD) in samples without UV treatment to 7 ± 3 (M ± SD) in post-UV treatment samples. In the latter, microbiota composition tended to positively change. Treatment of the peri-implantation field with UV leads to lowered peri-implantitis risk, positively affects the pattern of changes in the oral microbiota, leads to reduced isolation of pathogenic microorganisms.