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Effects of tooth bleaching on shear bond strength of brackets rebonded with a self-etching adhesive system

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Abstract

The purpose of this study was to ascertain the effects of tooth bleaching on the shear bond strength of orthodontic brackets rebonded with a self-etching adhesive system. A total of 39 premolars were collected and divided into three equal groups: in group 1 bracket bonding was performed without bleaching treatment; specimens in group 2 were bonded immediately after bleaching; and group 3 teeth were bleached, then immersed in artificial saliva and left for 7 days before bonding. The shear bond strength was measured, with the bonding/debonding procedures repeated once after the first debonding, and the bracket/adhesive failure modes were evaluated by the adhesive remnant index after each debonding. Excepting the mean shear bond strength for group 2 after the first debonding, the overall mean values reached the minimum clinical requirement of 6 MPa. The mean values at the first and second debondings were significantly higher in groups 1 and 3 than in group 2. Between groups 1 and 3, significant differences were noted at the first debonding, but not at the second debonding. Group 2 showed significant differences in mean shear bond strength between the first and second debondings. Bond failure at the enamel-adhesive interface occurred more frequently in group 2 than in groups 1 or 3 after the first debonding. The bracket-rebonding procedure can recover the reduced shear bond strength caused by immediate bonding after bleaching to a clinically acceptable level, but not to the prebleaching level.

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Authors and Affiliations

  1. Orthodontic Dentistry, The Nippon Dental University Niigata Hospital, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan

    Ryota Abe & Toshiya Endo

  2. Department of Pediatric Dentistry, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan

    Shohachi Shimooka

Authors
  1. Ryota Abe
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  2. Toshiya Endo
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  3. Shohachi Shimooka
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Correspondence to Toshiya Endo.

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Abe, R., Endo, T. & Shimooka, S. Effects of tooth bleaching on shear bond strength of brackets rebonded with a self-etching adhesive system. Odontology 99, 83–87 (2011). https://doi.org/10.1007/s10266-010-0138-z

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  • DOI: https://doi.org/10.1007/s10266-010-0138-z

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