Abstract
In previous paper, a trial study on the gloss meter (VM 2D) was reported.
The system has been developed further in order to obtain optimum results for the measurement of tooth gloss and for brushing teeth with dentifrice abrasives. Signal-to-Noise (S/N) ratios were calculated to obtain the optimum conditions, and the results demonstrated that the following conditions were most favorable:
1) The angle between incidence and reflection was 60°.
2) The mean of two maximum values from the gloss and reflex values, which were taken from the picture drawn by the X-Y recorder, was the most precise.
3) The most suitable number of brushing strokes was 600, and the most suitable brushing load was 800 grams.
In addition, morphological observation of enamel surface demonstrated that the enamel surface was abraded by the dentifrice abrasive M1, but gloss value was high.
On the other hand, the abrasive M2 showed opposite results, with low abrasion but low gloss value.
The abrasive M3 was significantly superor in making a glooy enamel surface.
