Surface Observation of the Er: YAG Laser Irradiated Restorative Alloys
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概要
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Recently, the Er: YAG laser has been applied to some kinds of dental treatments. The aim of this study was to observe the surface changes of the restorative alloys irradiated by the Er: YAG laser. The specimens (8mm ∅×4mm high) were prepared from 5 alloys. [G;Type II gold alloy (CASTING GOLD M.C. TYPE II GC, Tokyo, Japan), 12% gold-silver-palladium alloy (PD; KINPARA S12% ISHIHUKU, Tokyo, Japan), silver alloy (S;MIRO 3, GC, Tokyo, Japan), amalgam (AM;SPHERICAL-D CAPSULE, SHOFU, Tokyo, Japan), gallium alloy (GA;Galliumalloy GF, Tokuriki, Tokyo, Japan)]. The specimens of G, PD and S were polished with silicon carbite paper to #1500. For AM and GA, two type of specimens were prepared [polished to #1500 (poAM, poGA), un-polished (noAM, noGA)]. The Er: YAG laser (KaVo K.E.Y. Laser) was irradiated to following 6 conditions: energy; 300mJ, pulse frequency; 1Hz, focal distance; 12mm, fine water mist; with/without, total pulse; 1, 3, 10 shots. The irradiated surface of specimens were observed using OPTIPHOTO (Nikon, Tokyo, Japan) and EPMA (Shimadzu, Kyoto, Japan). The results were as follows: 1. The Er: YAG laser irradiation did not affect G and PD. 2. S, poAM, noAM, poGA, noGA were melted by the Er: YAG laser irradiation. The surface of S was like beegum.<BR>The surface of poAM and noAM was crater form. The surface of poGA and noGA was like a thin film. 3. In cases of 10 shots irradiation to S, poAM, noAM, poGA, noGA and 3 shots irradiation to S and noGA, irradiation with the fine water mist spray caused more effect than irradiation without the fine water mist. In the other cases, the effects of fine water mist spray were little.
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