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Objective: To compare; the shear bond strength of metallic brackets, the residual adhesive after debonding using two concentrations of sulfated polyacrylic acid and the conventional acid etchant, and the topography of treated enamel using Atomic Force Microscopic examination (AFM). Methodology: A total of 75 premolars were divided into three groups; 20 teeth each for shear bond strength test, and 5 teeth each for AFM. Three solutions were used; Solution I, 37% phosphoric acid, and two concentrations of sulphated polyacrylic acid (Solutions II, and III). Brackets were bonded, and the shear bond strength was measured using a universal testing instrument at a crosshead speed of 1mm/min. The residual adhesive was explored using a stereomicroscope at 20 times magnification, and quantified using the ARI. The topographic pattern of treated enamel was evaluated, using AFM, and an untreated enamel as a negative control. Results: Solutions II and III, demonstrated lower shear bond strength (10.6MPa, 6.1MPa), compared with that of acid etchant (17.5 MPa). A significant difference in the distribution of ARI scores was found between group I and II, III (P ≤0.001), with * Lecturer of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Mansoura University. ** Lecturer of Orthodontics, Faculty of Dentistry, Mansoura University. Egyptian Orthodontic Journal 94 Volume 38 – December 2010 more cement remaining on the teeth of group I. The AFM images showed a noticeable difference in the surface topography, with crystal deposits on the enamel surfaces treated with solution II. Conclusions: The concentration of 30% sulfated polyacrylic acid can be considered as an alternative to phosphoric acid. The shear bond strength value obtained was above the minimum of the clinically accepted for orthodontic use.

The effect of crystal growth on shear bond strength of metallic brackets and atomic force microscope topographic evaluation of treated enamel