title: Effect of enamel surface treatment on the bond strength of metallic brackets in rebonding process.
abstract: Bond failure after rebonding for newly placed brackets can be reduced by appropriate enamel surface treatment. This in vitro study investigated the effect of two enamel surface treatments on the bond strength of metallic brackets in the rebonding process. After debonding the brackets and removing the residual adhesive on the enamel surface of 50 upper premolar teeth, the teeth were divided into two equal groups. In the first group, the enamel surface was etched with phosphoric acid 37 per cent, and in the second group, the teeth were sandblasted prior to acid etching. After bonding of the new brackets, the shear bond strength (SBS), probability of bond failures, and adhesive remnant index (ARI) were determined and compared with the t-test, Weibull analysis, and chi-square test. Mean SBS in both groups did not differ significantly (P = 0.081). Most bond failures occurred with ARI scores of 2 and 3, and the difference between the two groups was statistically significant (P < 0.001). Weibull analysis showed that for a given stress, the probability of failure differed between groups. Enamel surface preparation with sandblasting prior to acid etching did not significantly improve SBS in bracket rebonding and left more residual adhesive remnants on the enamel surface.
authors.affiliation: Orthodontic Research Center, Department of Orthodontics, Shiraz University of Medical Sciences.
authors.forename: H R
authors.initials: HR
authors.lastname: Pakshir
authors.forename: H
authors.initials: H
authors.lastname: Zarif Najafi
authors.forename: S
authors.initials: S
authors.lastname: Hajipour
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000268:Adhesiveness / Q000187:drug effects; D000293:Adolescent; D000328:Adult; D001641:Bicuspid; D016009:Chi-Square Distribution; D001840:Dental Bonding / Q000379:methods* / Q000592:standards; D003743:Dental Enamel / Q000187:drug effects; D003799:Dental Stress Analysis / Q000379:methods; D006245:Hardness Tests; D006801:Humans; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D019233:Retreatment / Q000379:methods; D033081:Shear Strength; D055815:Young Adult
chemical_list: D010756:Phosphoric Acids; D019279:Resin Cements; C030242:phosphoric acid