Mean ± SD

Median IQR

Group A

Unpolished polymethyl methacrylate

23.2 ± 3.7

22.7

3.8

Polished polymethyl methacrylate

9.4 ± 0.7

9.34

1.08

Group B

Unpolished bis-acrylic resin

36.6 ± 8.2

35.9

11.4

Polished bis-acrylic resin*

6.7 ± 0.5

6.9

0.6