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Eur J Orthod. 2014 Jun;36(3):297-302. doi: 10.1093/ejo/cjt051. Epub 2013 Sep 23.

Bonding orthodontics brackets to enamel using experimental composites with an iodonium salt.

Author information

1
*Department of Restorative Dentistry, Dental Materials Division Piracicaba Dental School, University of Campinas, Sao Paulo.
2
**Department of Orthodontics, Graduate Program in Orthodontics, University of Araras, Sao Paulo.
3
***Department of Pediatric Dentistry, Piracicaba Dental School, University of Campinas, Sao Paulo.
4
****Materials Engineering School, and.
5
*****Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Rio Grande do Sul, Brazil.
6
*Department of Restorative Dentistry, Dental Materials Division Piracicaba Dental School, University of Campinas, Sao Paulo, sobrinho@fop.unicamp.br.

Abstract

OBJECTIVES:

This study investigated whether the addition of diphenyliodonium chloride (DPC) to experimental resin bonding agents would allow fixation of brackets to enamel using shorter light exposure times.

METHODS:

Photoactivated dimethacrylate-based composites were prepared containing DPC molar concentrations of 0 (control), 0.5 (R05), or 1 per cent (R1). Metallic brackets were bonded to bovine incisors and the bond strengths were evaluated using a shear test. In total, 18 groups were tested (n = 15 per group) defined by three bonding materials (control, R05, or R1), three light-activation time (8, 20, or 40 seconds), and two storage periods (10 minutes or 24 hours). The adhesive remnant index (ARI) was scored under magnification. Data were statistically analysed at a 5 per cent significance level.

RESULTS:

At 10 minutes, the control composite showed lower bond strengths than the DPC-modified bonding agents for all light-activation times. Differences in bond strengths between both DPC-modified agents were not significant. Lower bond strengths at 10 minutes were generally observed for groups light activated for 8 seconds compared with groups light activated for 20 and 40 seconds. At 24 hours, no significant differences were observed among the light-activation times. The bond strengths at 24 hours were higher than the bond strengths at 10 minutes for all groups. A predominance of ARI scores 2 and 3 was generally observed.

CONCLUSION:

The use of a ternary photoactivation system containing an iodonium salt in bonding composites may allow bonding brackets to enamel using reduced light exposure times.

PMID:
24062381
DOI:
10.1093/ejo/cjt051
[Indexed for MEDLINE]

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