Effect of Application Four Different Etching systems on Bond Strength of Orthodontic Brackets

This study aimed to compare the effects of different enamel etching techniques for bracket bonding strength. The sample consisted of eighty human premolars were randomly divided into four equal groups. The enamel surfaces of the teeth were etched with 35% orthophosphoric acid in Group 1 , air abraded with 50 μm aluminum oxide prior to acid etching in Group 2, Trans bond Plus Self-etching Primer (TPSEP) in Group 3 , Er: YAG laser in Group 4. After enamel etching procedures, brackets were bonded with Trans bond XT , then shear bonding test was performed using a testing machine (Tinius Olsen).