Affiliation: School of Dentistry, Department of Orthodontics
Objectives: To assess in vitro shear bond strength (SBS), modified adhesive remnant index (ARI), and treated enamel surface textures of various bracket bonding techniques. Methods: Extracted human premolars (n=97) were randomly assigned to six groups and bonded using assigned protocols. SBS was measured using a universal testing machine. Modified ARI was measured via optical stereomicroscopy. Etched enamel surface textures were qualitatively described using scanning electron microscopy (SEM). Results: There was a statistically significant interaction between bonding technique and bracket placement. Various significant differences were found between groups. All groups exhibited clinically acceptable means SBS. ARI measurements differed between bonding techniques for both maxillary and mandibular brackets. Conclusions: All tested methods exhibited clinically acceptable shear bond strengths. Pre-etching prior to the application of SEP may enhance the strength of brackets compared to SEP alone. Pretreatment of normal enamel surfaces with NaOCl for 1 minute may affect the mode of failure.