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Shear bond strength of orthodontic brackets bonded with a new self-adhering flowable resin composite

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Clinical Oral Investigations Aims and scope Submit manuscript

Abstract

Objectives

This study aims to assess the shear bond strength (SBS) to enamel and the distribution of failure modes of brackets bonded using a new self-adhering flowable resin composite (Vertise Flow, VF), with or without preliminary phosphoric acid etching (PAE).

Materials and methods

Eighty extracted premolars were randomly divided into four groups (n = 20): (1) etch-and-rinse adhesive (E&R), PAE/Transbond XT Primer/Transbond XT Paste (3M Unitek); (2) self-etch adhesive (SE), Transbond Plus Self–Etching Primer (3M Unitek)/Transbond XT Paste; (3) VF; (4) PAE/VF. In each group, 10 bracketed teeth were debonded within 30 min, while the remaining teeth were subjected to thermocycling before testing. SBS and adhesive remnant index were recorded.

Results

SE measured significantly lower early SBS than PAE/VF. Early SBSs recorded by VF were slightly higher yet statistically similar to those of E&R. Such levels of adhesion were achieved by VF regardless of preliminary PAE. After thermocycling, VF measured the lowest SBS. When debonded early, VF and SE tended to leave less residues on enamel surface than E&R. After thermocycling, the failure pattern changed significantly for VF and PAE/VF specimens that all exhibited adhesive failures at the tooth–bracket interface.

Conclusions

VF achieved early bracket SBSs similar to E&R. Following thermocycling, VF and PAE/VF manifested a significant decrease in SBS.

Clinical relevance

Although the simplified handling and the satisfactory early SBS of VF may prompt its use for bracket bonding, the decrease in retention noted after thermocycling warns that the issue of bond durability should be thoroughly addressed prior to endorsing this clinical application of VF.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Dental Materials and Fixed Prosthodontics of the University of Siena, Tuscan School of Dental Medicine, University of Firenze and Siena, Policlinico ‘Le Scotte’, viale Bracci, Siena, 53100, Italy

    Cecilia Goracci, Mariam Margvelashvili, Alessandro Vichi & Marco Ferrari

  2. Department of Oral Sciences, Prosthodontics Unit, ‘Sapienza’ University of Rome, Via Caserta 6, Rome, 00100, Italy

    Agostino Giovannetti

Authors
  1. Cecilia Goracci
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  2. Mariam Margvelashvili
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  3. Agostino Giovannetti
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  4. Alessandro Vichi
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  5. Marco Ferrari
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Correspondence to Cecilia Goracci.

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Goracci, C., Margvelashvili, M., Giovannetti, A. et al. Shear bond strength of orthodontic brackets bonded with a new self-adhering flowable resin composite. Clin Oral Invest 17, 609–617 (2013). https://doi.org/10.1007/s00784-012-0729-x

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  • DOI: https://doi.org/10.1007/s00784-012-0729-x

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