The Er:YAG laser has been used for dental caries treatment, periodontal and root canal treatment. The purpose of this study was to clarify the effect of the Er:YAG laser on implant fixtures that had three types of surfaces (TI: polished blasted titanium, TPS: titanium plasma splayed implant, HA: hydroxyapatite coated implant). The Er:YAG Laser (The KaVo KEY Laser® 1242, KaVo,Germany)irradiated the implant fixture surface under the energy conditions of 32,75,97,135 and 270 mJ using contactfiber. The irradiated surface was observed by OPTIPHOTO (Nikon, Tokyo) and EPMA-8705(Shimadzu, Kyoto). The affected surfaces were analyzed by EPMA-8705. The results were as follows:
1. The color of TI became brown, black-brown and brown-gold. The center of melted area of 270 mJ was blue.
2. TPS surface was melted, the color was brilliant-blue, black-brown. The melted area increased with increasing irradiating energy.
3. The color of HA became white, brown, black‐brown and black.
4. The results of EPMA analysis suggested that the Er:YAG laser irradiation ablated the hydroxyapatite of HA surface.
