Table 4.

Comparison of surface roughness in all the study groups before wear test

Group	Mean±SD	P One way ANOVA	Tukey’s post hoc
Group MG	0.30±0.04	<0.001	LG>LP>MG>MP
Group MP	0.19±0.02
Group LG	0.59±0.06
Group LP	0.39±0.05

A one-way ANOVA was performed to compare surface roughness in 4 different types of material. There was a significant difference between the mean surface roughness of the 4 groups. On further post hoc analysis, it was revealed that the LG group had significantly greater roughness than that of LP, MG, and MP, respectively. LP was significantly greater than MG and MP, respectively, while MG was significantly greater than that of MP. SD: Standard deviation, MG: Monolithic glazed, MP: Monolithic polished, LG: Layered glazed zirconia, LP: Layered polished zirconia