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Effect of multiple debonding sequences on shear bond strength of new stainless steel brackets
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Eslamian, Ladan, Borzabadi-Farahani, Ali, Tavakol, Pegah, Tavakol, Ali, Amini, Nazila and Lynch, Edward (2015) Effect of multiple debonding sequences on shear bond strength of new stainless steel brackets. Journal of Orthodontic Science, Volume 4 (Number 2). pp. 37-41. doi:10.4103/2278-0203.156027
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Official URL: http://dx.doi.org/10.4103/2278-0203.156027
Abstract
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.
| Item Type: | Journal Article | ||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||
| Divisions: | Faculty of Medicine > Warwick Medical School > ( - July 2016) Medical Education Hub Faculty of Medicine > Warwick Medical School |
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| Library of Congress Subject Headings (LCSH): | Stainless steel -- Structure, Shear (Mechanics), Brackets, Enamel and enameling | ||||
| Journal or Publication Title: | Journal of Orthodontic Science | ||||
| Publisher: | Medknow | ||||
| ISSN: | 2278-0203 | ||||
| Official Date: | 29 April 2015 | ||||
| Dates: |
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| Volume: | Volume 4 | ||||
| Number: | Number 2 | ||||
| Number of Pages: | 5 | ||||
| Page Range: | pp. 37-41 | ||||
| DOI: | 10.4103/2278-0203.156027 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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