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The European Journal of Orthodontics Advance Access published online on February 22, 2006
The European Journal of Orthodontics, doi:10.1093/ejo/cji107
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© The Author 2006. Published by Oxford University Press on behalf of the European Orthodontics Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Article

Bonding characteristics of a self-etching primer and precoated brackets: an in vitro study

Sunil Hirani 1 * and Martyn Sherriff 2

1 Department of Orthodontics, Dental Institute of King's College London, UK
2 Department of Biomaterials Sciences, Dental Institute of King's College London, UK

* To whom correspondence should be addressed.
Sunil Hirani, E-mail: sunilhirani{at}aol.com


  Abstract

Little is known about the performance of TransbondTM Plus Self-Etching Primer (TPSEP), especially when used with Adhesive Precoated BracketsTM (APC 1 and APC 2). The aim of this study was to compare the shear bond and rebond strengths and failure sites of APC 1 and APC 2 with a non-coated bracket system [Victory Series (V)] using Transbond XTTM light-cured adhesive and TPSEP or 37 per cent phosphoric acid as the conditioner.

The results demonstrated that on dry testing of 120 brackets when applying an occluso-gingival load to produce a shear force at the bracket-tooth interface, there was no statistically significant difference in the shear bond strength (SBS) of APC 1 (68.4 N), APC 2 (74.9 N), and V brackets (75.4 N, control group). There was also no significant difference in bond failure sites of the APC 1 and APC 2 when compared with the non-coated bracket system using Transbond XT light-cured adhesive and TPSEP, with bond failure for all groups occurring mainly at the adhesive-enamel interface. There was a significant difference in the SBS of the V brackets when using TPSEP and 37 per cent phosphoric acid as the conditioners. The latter was lower (60.6 N) and the bond failure site changed from the enamel-adhesive interface to the bracket-adhesive interface.

The shear rebond strengths of all bracket types were statistically significantly lower (P < 0.05) than their initial SBS (APC 1, APC 2, and V: 35.9, 36.7, and 34.1 N, respectively) and the locus of bond failure altered from the adhesive-enamel interface to the bracket-adhesive interface. A clinical trial using TPSEP as a conditioner would be useful as the time taken to remove the adhesive from the enamel surface may be reduced following debond.


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