Korean J Orthod.  2010 Oct;40(5):342-348. 10.4041/kjod.2010.40.5.342.

Bond strength of orthodontic brackets bonded to enamel with a self-etching primer after bleaching and desensitizer application

• Attar N
• Korkmaz Y
• Kilical Y
• Saglam-Aydinatay B
• Bicer CO

• KMID: 2273225
• DOI: http://doi.org/10.4041/kjod.2010.40.5.342

Abstract

OBJECTIVE
The aim of this study was to compare the shear bond strengths (SBS) of orthodontic brackets bonded to enamel with a self-etching primer after bleaching, desensitizer application and combined treatment.
METHODS
Forty-eight premolars were randomly divided into four groups, each with n = 12 premolar samples. The four groups were; Group1: 15% hydrogen-peroxide office bleaching agent (Illumine Office-IO), Group 2: IO + BisBlock Oxalate Dentin-Desensitizer, Group 3: Bis Block Oxalate Dentin-Desensitizer, Group 4: No treatment (control). Twenty-four hours after bonding, the specimens were tested in SBS at a crosshead speed of 5 mm/min until the brackets debonded. The failure mode of the brackets was determined by a modified adhesive remnant index.
RESULTS
Bleaching, bleaching and desensitizer treatment, and desensitizer treatment alone all significantly reduced SBS of the orthodontic brackets (p = 0.001). No statistically significant difference was found between Group 1, Group 2 and Group 3 (Group 1-Group 2, p = 0.564; Group 1-Group 3, p = 0.371; Group 2-Group 3, p = 0.133). The predominant mode of failure for the treatment groups (Group1, Group 2 and Group 3) was at the enamel-adhesive interface leaving 100% of the adhesive on the bracket base.
CONCLUSIONS
Bleaching and desensitizer treatment should be delayed until the completion of orthodontic treatment.

Keyword

Bracket; Adhesive; Bonding

MeSH Terms

Adhesives
Bicuspid
Dental Enamel
Orthodontic Brackets
Oxalic Acid
Adhesives
Oxalic Acid

Figure

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  Fig 1. Schematic view of the mean shear bond strength values and standard deviations of the groups tested.

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  Fig 2. Schematic view of frequency distribution of Adhesive Remnant Index (ARI) scores among groups.

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