Study on bactericidal effects by laser beam irradiation in the suspension with inorganic powder

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In this study, the dynamic stress generated in the suspension with inorganic powder induced by laser beam irradiation was measured, and the phenomenon of the laser beam irradiation in the water environment was observed with a high speed video camera. In addition, the surface temperature on the enamel surface of the human tooth during cavity preparation by the irradiation of YAG laser beam was measured by the three-color pyrometer with an optical fiber. Moreover, the bactericidal effects by the YAG laser irradiation under the presence of inorganic powder were investigated morphologically, then the samples were observed by the SEM.Regarding the bactericidal effects by laser beam irradiation, there was a significant reduction such as 90 - 99.9% of viable cells. SEM investigations revealed the morphological damage according to pulse energies and exposure times. The bactericidal action occurred by the dynamic stress and the temperature rise induced by the laser beam irradiation