highly significantP <0.001
Two-way ANOVA revealed that the monomer type variable had a highly significant impact, and with a greater effect size, on the viscosity averages of the composites (two-way ANOVA, P <0.001, η p 2 = 0.93), although the powder-liquid-ratio was also significant (two-way ANOVA, P <0.001, η p 2 = 0.86).