Fig. 3From: Automatic exposure compensation in intraoral digital radiography: effect on the gray values of dental tissuesGraphs showing the mean Δ gray values and standard deviation between high-density and control groups for enamel and dentine of the first (1 M) and second molars (2 M) using 60 kV and 70 kV with an exposure time of 0.06 s for the Express systemBack to article page