Effects of fluorosed enamel on orthodontic bracket bonding : An in vitro study.

Objective: To investigate the effect of enamel deproteinization and air abrasion on shear bond strength (SBS), adhesive remnant index (ARI) scores, and surface topography when bonding orthodontic brackets to fluorosed enamel.

Materials And Methods: The sample included 90 fluorosed and 30 normal premolars divided into four groups: group I (fluorosed premolars subjected to air abrasion before acid etching), group II (fluorosed premolars subjected to deproteinization before acid etching), group III (fluorosed premolars; control for groups I and II), and group IV (normal premolars; control for group III). Bonding procedures included etching with 37% phosphoric acid, priming with Transbond XT primer (3M Unitek, Monrovia, CA, USA), and application of Transbond XT adhesive paste (composite; 3M Unitek, Monrovia, CA, USA).