Table 4 Mean (± standard deviation) of Vickers microhardness (VHN) according to experimental conditions (EC) and time (T) for each brushing condition (B)

Non Brushing

Control

40.3 (± 2.5)^Aa

42.3(± 2.7)^Aa

41.1 (± 2.5)^Aa

0.282

COW

39.4 (± 2.7)^Aa

39.5(± 1.9)^Ba

40.7 (± 2.8)^Aa

0.391

CPWC

41.4(± 2.3)^Aa

41.5(± 2.2)^Aa

40.0 (± 2.9)^Aa

0.454

p^a

0.271

0.042

0.682

Brushing

Control

40.0(± 1.8)^Aa

42.2(± 2.3)^Aa

41.2(± 2.8)^Aa

0.150

COW

40.8(± 3.1)^Aa

41.4(± 2.5)^Aa

40.7(± 2.3)^Aa

0.842

CPWC

39.4(± 2.5)^Aa

40.4(± 2.8)^Ab

41.5(± 2.2)^Ab

0.296

p^a

0.484

0.328

0.756