Table 2: Radiopacity (shades of gray) and the aluminum equivalent in millimeters (mm Al) of the different materials evaluated.

Mean grayRadiopacity value (mm Al equivalent)

Tetric Ceram84.20 (±9.68)3.10 (±0.32)
TPH72.20 (±7.05)2.65 (±0.31)
SDR52.60 (±3.51)1.94 (±0.14)
Z35048.20 (±2.77)1.78 (±0.12)
Z350 flow38.40 (±3.97)1.44 (±0.16)
P9025.60 (±1.00)0.99 (±0.12)

Enamel22.60 (±5.86)0.91 (±0.22)
Dentin14.20 (±2.28)0.63 (±0.12)

Different letters: significant difference between resins, (ANOVA-Tukey test).
Significant difference for the enamel (x) and dentin (y), (ANOVA-Dunnett’s test).
No significant difference for the 1 mm Al, (one-sample t-test).