象牙質表面性状に及ぼすEr:YAG laser照射の影響について

抄録

Changes in topography of the dentin surface induced by Er:YAG laser irradiation during laser scaling should be considered because alterations to the microstructure of the root surface may lead to post-operative pain, including dental hypersensitivity. The aim of this study was to examine the effects of Er:YAG laser irradiation on the dentin surface. We observed the dentin surface after irradiation by scanning electron microscope （SEM） and performed a morphometric analysis. The dentin slice discs from extracted human teeth were irradiated with the Er:YAG laser under three power conditions: 10 pps-30mJ/pulse, 10pps-40mJ/pulse, or 10pps-50mJ/pulse. The chip was moved at 1cm/s during irradiation. The discs were observed by SEM, and the length, width, and depth of cavities formed by one pulse of laser irradiation were measured. There was no significant difference in the surface shape of cavities （length and width） among the groups. The depth of cavities formed by 30mJ/pulse, 40mJ/pulse, or 50mJ/pulse irradiation significantly increased with energy. Our study demonstrates that laser irradiation on the root surface during laser scaling alters the topography of the dentin surface, and our results may aid in deciding the irradiation conditions for laser scaling.