Abstract
The purpose of this study was to determine if a cavity prepared using the Er: YAG laser could be restored with restorative materials other than composite resin. A class V cavity for the composite resin and a class I cavity for the amalgam, gold foil, and inlay, were prepared in the human premolars an using the Er: YAG. laser. The cavities were restored with these restorative materials. The boundaries between the teeth and the restorative materials were observed using a DIGITAL MICRO SCOPE-6300. The following results were odtained; 1. Because all the margins of the cavities were rough, it was suggested that those should be trimmed using a rotary cutting instrument. 2. For composite resin restoration, the need of the further investigation of the method of finishing the cavity wall and treating that surface, was suggested. 3. Undercut was observed on the cavity wall. This undercut will be useful as a retention form for amalgam restoration and a convenient form for gold foil restoration. 4. For inlay restoration it was suggested that lining was needed to make the roughness of the cavity wall smooth.
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