Home Print this page Email this page Small font size Default font size Increase font size   Users Online: 216
Home About us Editorial board Search Browse articles Submit article Instructions Subscribe Contacts Login 
ORIGINAL ARTICLE
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
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2278-0203.156027

Rights and Permissions

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.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed2767    
    Printed80    
    Emailed0    
    PDF Downloaded490    
    Comments [Add]    
    Cited by others 6    

Recommend this journal