Laser Application and Root Canal Sealing of Endodontically Treated Teeth

Aim: The aim of this in vitro study was to investigate the effect of two different types of laser irradiation (Er: YAG and diode laser) on the hermetic sealing of endodontically treated teeth. Methods.48 human single rooted teeth were randomly assigned into 4 groups. Root canal preparation was done using ProTaper Next rotary system up to X3. The laser irradiation was performed at the end of the traditional endodontic preparation as a final means of decontaminating the endodontic system. Teeth were filled with a core-carrier system Guttacore (Dentsply, Sirona) and sealer AH-plus. Results: Statistical analysis showed that all groups had significantly less leakage in apical third than the control group. The laser-treated groups presented better results than Group II (traditional disinfection protocol), without statistically significant difference. The morphological changes on the apical intraradicular dentin surface caused by Er: YAG laser irradiation resulted at least linear dye apical leakage. Conclusion: Application of diode and Er: YAG lasers improves the apical seal of root canals in endodontically treated teeth. Combined use of laser systems with appropriate parameters and routine irrigation protocols facilitates the adhesion of root canal filling materials to root dentin.