highly significantp ≤ 0.001
A statistically highly significant difference in color change (ΔE) among the three groups was found ( p ≤ 0.001) at each post-immersion interval ( Fig. 2 ).
A statistically highly significant difference in color change (ΔE) among the three groups was found ( p ≤ 0.001) at each post-immersion interval ( Fig. 2 ).