Does the time interval after bleaching influence the adhesion of orthodontic brackets?
Nascimento Glaucia Cristina Rodrigues, Miranda Cyndi Albuquerque de, Machado Sissy Maria Mendes, Brandao Gustavo Antonio Martins, Almeida Haroldo Amorim de, Silva Cecy Martins,
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( Nascimento Glaucia Cristina Rodrigues ) - Brazil Federal University of Para School of Dentistry Department of Dentistry
( Miranda Cyndi Albuquerque de ) - Brazil Federal University of Para School of Dentistry Department of Dentistry
( Machado Sissy Maria Mendes ) - Brazil Federal University of Para School of Dentistry Department of Dentistry
( Brandao Gustavo Antonio Martins ) - Brazil Federal University of Para School of Dentistry Department of Dentistry
( Almeida Haroldo Amorim de ) - Brazil Federal University of Para School of Dentistry Department of Dentistry
( Silva Cecy Martins ) - Brazil Federal University of Para School of Dentistry Department of Dentistry
KMID : 0361920130430050242
Abstract
Objective: To test the null hypothesis that no difference exists between the effects of at-home bleaching and in-office bleaching on shear bond strength (SBS) with bracket bonding at 4 different time intervals after dental bleaching.
Methods: Ninety extracted human premolars were randomly divided into 9 groups (n = 10) according to the bleaching methods used (at-home bleaching and in-office bleaching) and the storage time in artificial saliva (30 min, 1 day, 2 weeks, and 3 weeks before bonding). The control group was stored in artificial saliva for 7 days. Brackets were bonded with the Transbond XT adhesive system, and SBS testing was performed. The adhesive remnant index (ARI) was used to assess the amount of resin remaining on the enamel surfaces after debonding. The SBS data were analyzed by analysis of variance (ANOVA) and the Tukey test. For the ARI, the Kruskal-Wallis test was performed. Significance for all statistical tests was predetermined to be p < 0.05.
Results: The SBS of the unbleached group was significantly higher (p < 0.05) than that of the bleached groups (except for the group bonded 30 min after at-home bleaching).
Conclusions: The null hypothesis was not totally rejected. All bleaching groups tested had decreased SBS of the brackets to the enamel, except for the group bonded 30 min after at-home bleaching. The SBS returned to values close to those of the unbleached enamel within 3 weeks following bleaching.
키워드
Bracket; Bonding; Biomaterial science; Bleaching
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