Table 2 Surface roughness (μm) parameters of specimens of resin composite cements MLA (Multilink Automix) and RUN (RelyX Unicem 2 Automix) with means and standard deviation of arithmetical mean height (R_a) and maximum height of profile (R_z)

Curing mode

Surface treatment

MLA

RUN

MLA

RUN

Autopolymerization

Oxygen inhibition layer

1.82 ± 0.20^Aa

3.94 ± 1.21^Ab

12.90 ± 1.80^Aa

32.00 ± 12.05^Ab

Polished

0.71 ± 0.04^Ba

0.65 ± 0.03^Ba

5.17 ± 0.31^Ba

4.92 ± 0.33^Ba

Scaler

3.12 ± 0.42^Ca

2.15 ± 0.84^Cb

18.02 ± 1.62^Ca

16.19 ± 7.96^Cb

Light-curing

Oxygen inhibition layer

0.96 ± 0.14^Da

0.83 ± 0.08^Bb

8.23 ± 1.95^Da

7.20 ± 1.26^BDb

Polished

0.67 ± 0.06^Ba

0.64 ± 0.07^Ba

4.65 ± 0.55^Ba

4.77 ± 0.57^Ba

Scaler

2.84 ± 0.46^Ea

1.25 ± 0.13^Cb

15.41 ± 1.83^Ea

8.55 ± 0.73^Db