Fig. 3From: Analytical strategies for clinical studies on dental erosive wearPart 1. Percentage surface reflection intensity (SRI) by the OptiPen after 1, 2, 4, 6, 8 and 10 min etch of the enamel specimens, after abrasion and after 15 min and 20 min etch. The error bars represent 1 standard deviationBack to article page