Figure 8.

A: Ground tooth section presenting 25 µm enamel loss after 3 applications, of 15 seconds each, of a mixture of 18% hydrochloric acid and pumice (25X); B: 23 µm after 4 applications, of a mixture of Prema Compound enamel microabrasive; C: 42 µm after 4 applications , of 1 minute each, of a mixture of 37% phosphoric acid and pumice; D: 80 µm after, after 4 applications, of 1 minute each, of Opalustre enamel microabrasive. The depression in the enamel convexity (W) designates where the microabrasion was performed. Analyzed by polarized light microscope; E: enamel; D: dentin; W: wear