PMC:2854328 / 9028-9430
Annnotations
Data were statistically analyzed using SPSS 15.0 package (Chicago, Illinois). Regression models with two-way ANOVA and Tukey’s post-hoc tests were used to test significance for the effects of composite material and bleaching agent on color and surface roughness at P≤.05. Pearson’s correlation coefficient was used to determine significant correlations between color and surface roughness measurements.