TREATMENT OF CHRONIC SIMPLE PERIODONTITIS USING THE METHOD OF ANTIMICROBIAL PHOTODYNAMIC THERAPY. PERFORMANCE STUDY USING OHI-S, SBI AND PI INDICES photodynamic therapy, laser, periodontal diseases, periodontal indices А. Kuvshinov , S. Naumovich , R. Mekhtiev https://doi.org/10.54890/1694-6405