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Title :Effects of tooth bleaching on shear bond strength of brackets rebonded with a self-etching adhesive system
Authors :Abe, Ryota
Endo, Toshiya
Shimooka, Shohachi
Publisher :Springer
Issue Date :Jan-2011
Journal Title :Odontology : Official journal of the Society of the Nippon Dental University
Volume :99
Issue :1
Start Page :83
End Page :87
ISSN :1618-1247
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 6MPa. 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 and 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.
Keywords :Tooth bleaching
Shear bond strength
Orthodontic bracket
Rebonding
Self-etching adhesive system
Type Local :Journal Article
Language :eng
URI :http://hdl.handle.net/10623/28381
Appears in Collections:10 査読済論文 = Postprint

Please use this identifier to cite or link to this item: http://hdl.handle.net/10623/28381

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