The effect of crystal growth on shear bond strength of metallic brackets and atomic force microscope topographic evaluation of treated enamel | ||
| Egyptian Orthodontic Journal | ||
| Article 6, Volume 38, December 2010, December 2010, Pages 93-106 PDF (1.08 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eos.2010.79025 | ||
| Authors | ||
| Abeer M Abdellatif* 1; Shaza M Hammad2 | ||
| 1Department of Pediatric Dentistry and Public Health, Faculty of Dentistry, Mansoura University, Mansoura, Egypt | ||
| 2Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt | ||
| Abstract | ||
| 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 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. | ||
| Keywords | ||
| crystal growth; Shear bond strength; residual adhesive; orthodontic brackets | ||
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