Comparative study of mechanical cleaning degree of the root canal inner wall with application various laser systems and photosensitizers

Laser is beginning to be actively used in modern endodontic practice. Antibacterial effect of the laser can be used for selective suppression of microorganisms. The aim of the study was to compare the quality of cleaning of the root canal inner wall after using various laser systems and photosensitizers. The research was conducted on extracted teeth the root canal of which were treated mechanically, medically according to the standard irrigation protocol with using ultrasound and laser treatment. We used apparatus for photodynamic therapy APhS-K 660 with photosensitizer «Photoditazine» and the diode laser complex «Lazurit» with photosensitizer «PACT Fluid Endo» for photoactivated disinfection. Then we obtained the tooth slices which we studied with scanning electron microscopy. As a result on the microphotographs of tooth slices we found incomplete removal of the «smear» layer, the minimal opening of dentinal tubules. The degree of contamination of the root canal inner wall after using the apparatus for photodynamic therapy APhS-K 660 in combination with photosensitizer «Photoditazine» was significantly higher than after using diode laser complex «Lazurit» and the photosensitizer «PACT Fluid Endo». The method of laser application requires further selection of regimes, duration of exposure and the sequence of inclusion of photodynamic therapy in the traditional root canal treatment scheme