Document Classification

Section Type: METHODS

Text: The teeth were randomly divided into four groups (n = 10) of different tooth surface conditions : group A : Clearfil Protect Primer applied gently (inactive) + Clearfil Protect Bond ; group B : 38 % phosphoric acid for 15 s, rinsed 15 s, and dried 15 s + Clearfil Protect Primer applied gently (inactive) + Clearfil Protect Bond ; group C : Clearfil Protect Primer applied with agitation by microapplicator brush (active) + Clearfil Protect Bond ; group D : 38 % phosphoric acid for 15 s, rinsed 15 s, and dried 15 s + Clearfil Protect Primer applied with agitation by microapplicator brush (active) + Clearfil Protect Bond.