Senior Scientist, Head of the Clinical Department of Endodontics and restorative Dentistry, University Clinical Hospital Centre KBC, Zagreb

Speech Title: The Influence of Er:YAG and Er,Cr:YSGG Laser Irradiation on Adhesion Properties of Adhesives and Bioceramics in Restorative Dentistry and Endo Surgery
Abstract: The adhesion and sealing ability of different dental materials, such as adhesives and bioceramics, on hard dental tissue can be affected by irradiation of dentine and enamel with Er:YAG or Er,Cr:YSGG laser beams. The adhesion on hard dental tissue and the sealing ability of these materials can be verified by measuring the leakage of dye through marginal gaps on the cavity walls or with the bacterial nutrient leakage model. Laser energy will not produce a smear layer during the removal of the dentin and enamel, but it can cause macroscopic disturbances or removal of the already produced smear layer. Furthermore, laser energy can denaturate proteins, dray the collagen, and cause the collapse of the collagen lattice on the dentine surface or even melt and partially carbonize the dentin and the enamel surface. This will affect the quality of adhesion and we need to think carefully when and for what purpose we use laser energy.