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The European Journal of Orthodontics Advance Access originally published online on February 4, 2009
The European Journal of Orthodontics 2009 31(3):266-270; doi:10.1093/ejo/cjn106
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© The Author 2009. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Should silane coupling agents be used when bonding brackets to composite restorations? An in vitro study

Ladan Eslamian*, Amir Ghassemi**, Fariborz Amini***, Alireza Jafari**** and Mona Afrand*****

* Department of Orthodontics, Dental Research Center, Shahid Beheshti University of Medical Sciences
** Department of Operative Dentistry, Dental Research Center, Shahid Beheshti University of Medical Sciences
*** Department of Orthodontics, School of Dentistry, Azad University of Medical Sciences, Tehran, Iran
**** Department of Orthodontics and Dentofacial Orthopedics, Bapuji Dental College and Hospital, Davangere, Karnataka, India
***** Private practice, Vancouver, Canada

Address for correspondence Ladan Eslamian, Department of Orthodontics and Iranian Center for Dental Research, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran, E-mail: l-eslamian{at}dent.sbmu.ac.ir


  Abstract

The purpose of this in vitro study was to determine a safe and efficient method for bonding brackets to resin composite (RC), permitting the brackets to tolerate shear forces and allowing removal without causing surface damage to the aesthetic restoration. The shear bond strength (SBS) of 60 brackets bonded to silanated and non-silanated RC surfaces were compared. A Bis-GMA containing orthodontic adhesive system was used to bond stainless steel upper lateral incisor brackets to 60 composite discs, half of which had surface treatment with a silane coupling agent. SBS testing was performed with an Instron universal testing machine. After debond, the bracket base and corresponding RC discs were examined under a stereomicroscope and analyzed using the Adhesive Remnant Index (ARI).

Non-parametric tests (Mann–Whitney U) indicated significant differences between the two groups (P < 0.009). Lower bond strengths were found for the silanated group implying that silane agents may be an unnecessary step. However, both groups had a clinically acceptable mean SBS [silanated group = 13.1 megapascals (Mpa), non-silanated group = 19.4 MPa]. Bond failure occurred at the bracket–adhesive interface in both groups. There would appear to be no advantage in using a silane agent when bonding metal orthodontic brackets to filled RCs.


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