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Year : 2015  |  Volume : 4  |  Issue : 2  |  Page : 37-41

Effect of multiple debonding sequences on shear bond strength of new stainless steel brackets

1 Department of Orthodontics and Dentofacial Deformities Research Center, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2 Warwick Dentistry, Warwick Medical School, University of Warwick, Coventry; NHS England (Locum Orthodontic Consultant), United Kingdom
3 Private Practice of Orthodontics, Tehran, Iran
4 Warwick Dentistry, Warwick Medical School, University of Warwick, Coventry, United Kingdom

Correspondence Address:
Dr. Ali Borzabadi-Farahani
Warwick Dentistry, Warwick Medical School, University of Warwick, Coventry
United Kingdom
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2278-0203.156027

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Objectives: This in-vitro study aimed at evaluating the effect of three debonding sequences on the shear bond strength (SBS) of new stainless steel (SS) brackets. Materials and Methods: Stainless steel twin brackets (0.022-inch, American Orthodontics, Sheboygan, WI, USA) were bonded with light cure adhesive (Transbond XT, 3M Unitek, St. Paul, MN, USA) to 80 newly extracted human premolars after acid etching with 37% phosphoric acid (30 s). Brackets were debonded with a universal testing machine, and new brackets were bonded to teeth using the same adhesive and same manner. This process was repeated twice, and brackets were debonded within 24 h after bonding. The longitudinal changes of average SBS were assessed with the repeated measures ANOVA. Post-hoc tests using the Bonferroni correction were also used to compare the average SBS at three debonding sequences. Result: The mean SBS decreased significantly after each debonding sequence (P < 0.01). The corresponding mean values (standard deviation, 95% CI) after the first, second, and third debonding sequences were 22.88 MPa (4.08, 21.97-22.79), 19.36 MPa (4.54, 18.62-20.64), and 16.67 MPa (4.27, 15.72-17.62), respectively. There was no significant difference among the adhesive remnant index (ARI) scores of three debonding sequences (χ2 = 5.067, df = 6, P = 0.53). Conclusion: Average SBS after three debonding sequences was significantly decreased, but was above the recommended 5.9-7.8 MPa. In-vivo studies are required to validate the finding of this study.

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