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In vitro effects of several surface preparation methods on shear bond strength of orthodontic brackets to caries-like lesions of enamel
 

Type:  Articles

Pubblication date:  09/2012

Authors:  M. Shahabi*, H. Moosavi**, A. Gholami***, F. Ahrari*

Language:  English

Institution:  *Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran **Dental Material Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran ***Dentist

Publication:  European Journal of Paediatic Dentistry

Publisher:  Ariesdue Srl

Keywords:  Bonding; Caries-like lesion; Demineralised enamel; Demineralisation; Bond strength; Self-etching primer; Sodium fluoride; Sodium hypochlorite.

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Title:  In vitro effects of several surface preparation methods on shear bond strength of orthodontic brackets to caries-like lesions of enamel

Abstract:  Aim The aim of this study was to evaluate the efficiency of several surface preparation methods for improving shear bond strength of brackets to demineralised enamel. Materials and methods Study design: in vitro study. Eighty premolars were selected and divided into 5 groups. Group 1 served as the control, while the remaining 4 groups were immersed in a demineralising solution (pH 4.8) for 12 weeks. In groups 1 (control) and 2 (demineralised/control) conventional acid etching was used. In group 3, a solution of 5% sodium hypochlorite (NaOCl) was applied on enamel surface for one minute after acid etching. The brackets in group 4 were bonded with Transbond Plus self-etching primer, and group 5 underwent treatment with a 2% sodium fluoride (NaF) gel, which was applied on the enamel surface for 4 minutes before etching. Shear bond strength (SBS) and adhesive remnant index (ARI) were determined in all groups, and surface morphology was examined under scanning electron microscope (SEM). Results The mean SBS of acid-etched demineralised enamel was significantly lower than that of acid-etched sound enamel (p<0.05). Treatment of caries-like lesions with 5% NaOCl or self-etching primer failed to improve the bond strength. After NaF treatment and acid etching of demineralised enamel, both type 1 and type 2 etching patterns were observed and the resulting SBS was comparable to that of sound enamel (p>0.05). Conclusion The application of 2% NaF on enamel caries before bracket bonding is an effective way for enhancing the bond strength.

 
 
 
 
 
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