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J Orthod Sci. 2017 Jan-Mar;6(1):16-21. doi: 10.4103/2278-0203.197394.

Efficacy of quercetin flavonoid in recovering the postbleaching bond strength of orthodontic brackets: A preliminary study.

Author information

1
Department of Orthodontics, University of Medical Sciences, Babol, Iran.
2
Department of Pharmacology, University of Medical Sciences, Babol, Iran.
3
Department of Restorative Dentistry, University of Medical Sciences, Babol, Iran.
4
Social Determinants of Health Research Center, University of Medical Sciences, Babol, Iran.
5
Department of Pediatric Dentistry, Dental Branch, Islamic Azad University, Tehran, Iran.

Abstract

OBJECTIVES:

To evaluate comparatively the effect of quercetin on postbleaching shear bond strength (SBS) and adhesive remnant index (ARI).

MATERIALS AND METHODS:

Intact maxillary premolars were divided randomly into 12 groups of 10 each: (1) bonding the bracket immediately after bleaching, (2) bonding 1 week after bleaching, (3-8) application of three experimental concentrations of quercetin (0.1%, 0.5%, and 1%) at two time durations (5 and 10 min), (9-10) application of the solvent of quercetin at two time periods (5 and 10 min), (11) application of 10% sodium ascorbate for 10 min, and (12) bonding the brackets on nonbleached teeth. Bleaching was performed using 15% carbamide peroxide gel for 5 days (6 h daily). After incubation and thermocycling, the SBS of brackets was measured. The ARI too was recorded at ×20. The data were analyzed statistically (α =0.05).

RESULTS:

Bleaching reduced the SBS below 10 Megapascal (MPa) level (P < 0.05) while all the postbleaching treatments (except the application of the solvent of quercetin) recovered the SBS back to values greater than 10 MPa (P < 0.05) and also back to nonbleached SBS levels (P > 0.01). All eight postbleaching treatments had rather similar efficacies (P = 0.1396). The concentration of quercetin (beta = 0.259, P = 0.042) but not its duration (beta = 0.213, P = 0.093) significantly improved its efficacy.

CONCLUSION:

Bleaching can weaken the bond strength of orthodontic brackets below acceptable levels. The application of quercetin or Vitamin C or delaying the bracket bonding improved the postbleaching SBS.

KEYWORDS:

Antioxidants; ascorbic acid; delayed bonding; orthodontic brackets; quercetin; shear bond strength; tooth bleaching

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