The Application of Laser to Endodontics

Its Principle and Practice

Abstract

In our Department, many studies on the application of laser to endodontics have been performed for more than 20 years. Nd: YAG laser, Er: YAG laser, and diode laser have been used in our experiments, and the application of lasers to direct pulp capping, prepared dentin cavity, pulpotomy, disinfection of the root canal, removal of canal obstructions and root canal preparation, laser Doppler flowmetry, and photodynamic diagnosis has been attempted.
As to the application of Nd: YAG laser to the prepared dentin cavity, direct pulp capping and pulpotomy, Nd: YAG laser irradiation promoted the healing of pulpal tissues and the formation of secondary dentin and/or dentin bridge. Also, Nd: YAG laser disinfected Streptococcus mutans in the canal in vitro. In addition, the parameters of laser irradiation in the root canal were examined, and the adverse reactions to the surrounding tissues caused by laser irradiation were evaluated. Furthermore, Nd: YAG laser was able to remove dowel cores, and gutta-percha from the root canal. We assessed pulpal blood flow by laser Doppler flowmetry in teeth with horizontal root fracture. Currently, we are trying to apply lasers to the root canal preparation, and some success has been obtained so far. Also, we are attempting to apply photodynamic diagnosis to endodontics.
In summary, we believe that lasers will be increasingly used in endodontic practice in the near future.