Surface Evaluation of Enamel Etched by Er,Cr:YSGG Laser for Orthodontic Purpose.

Aim: To compare the effect of erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser at different irradiation parameters and acid etching on the shear bond strength (SBS) of orthodontic brackets to enamel.

Materials And Methods: Forty bovine incisors were randomly distributed into groups ( = 10): GI: 37% phosphoric acid etching; GII: Er,Cr:YSGG laser etching 19.1 J/cm; GIII: Er,Cr:YSGG, 29.