Orthodontic Bracket Bond Strength Using Self-Etching Primer With or Without Pumice or Acid Etch Pretreatment

• Main Author: DeCastro, Ana Paula
• Format: Others
• Published: VCU Scholars Compass 2008
• Subjects: orthodontics; etch; bonding; pre-etch; self-etch primers; Dentistry; Medicine and Health Sciences; Orthodontics and Orthodontology
• Online Access: http://scholarscompass.vcu.edu/etd/1275; http://scholarscompass.vcu.edu/cgi/viewcontent.cgi?article=2274&context=etd

The purpose of this study was to compare the shear bond strength of orthodontic brackets to enamel in four bonding protocols: SEP without prior pumicing (None), Pre-etch and SEP without prior pumicing (Pre-etch), control: SEP with prior pumicing (Pumice), and Pre-etch and SEP with prior pumicing (Both). 80 extracted bovine incisors were randomly divided into 4 groups of 20, and brackets were bonded under the different experimental conditions. Debonding force was measured with an Instron universal testing machine. A two-way ANOVA comparing the four groups indicated that there was a significant difference in debonding force (P = 0.001). The SEP without prior pumicing group (17.69 ± 7.18 MPa) was statistically different from the SEP group with prior pumicing (25.82 ± 6.84 MPa). There was no statistical difference found among the other groups. Differences in the Adhesive Remnant Index (ARI) were analyzed by chi-square. ARI scores differed significantly (P =0.0048).