FIG. 4.

Scanning electron microscopic (SEM) image of the dentin specimen (×500). Most of dentinal tubules were thought to be occluded by shavings in the process of polishing (A). In the laser+DDS (B,C) group, the orifice of dentinal tubules appeared. The morphologic alterations caused by laser were not observed in the 1W+DDS group. The straight-line, laser-treated site showed a groove-like appearance in the 2W+DDS group, and dentinal tubules occlusion were observed at the lased area (arrow) (C).