Group A

37% of phosphoric acid + primer + Bonding immediately (negative control)

Group B

Self-etching primer + Bonding immediately (positive control)

Group C

Gel1 + primer + Bonding immediately

Group D

Gel2 + primer + Bonding immediately

Group E

Gel3 + primer + Bonding immediately

Group F

Gel4 + primer + Bonding immediately

Group K

Gel1 + Bonding immediately

Group L

Gel2 + Bonding immediately

Group M

Gel3 + Bonding immediately

Group N

Gel4 + Bonding immediately