Abstract
ABSTRACTObjective: The aim of this experimental in vitro study was to evaluate whether dental bleaching performed before orthodontic treatment change the shear bond strength (SBS) of monocrystalline and polycrystalline esthetic brackets. Methods: Sixty (60) bovine incisors teeth were used and randomly divided into the following six groups (n=10): SCP (without bleaching/polycrystalline brackets); SCM (without bleaching/monocrystalline brackets); 1CP (one bleaching session/polycrystalline brackets); 1CM (one bleaching session/monocrystalline brackets); 3CP (three bleaching sessions/polycrystalline brackets); and 3CM (three bleaching sessions/monocrystalline brackets). The brackets were bonded seven days after the bleaching sessions. The samples were submitted to the SBS test in a universal testing machine (Instron model 4411) at 1 mm/min crosshead speed. The two-way analysis of variance (ANOVA) and the Tukey tests were performed at a 5% level of significance. After the mechanical test, samples were evaluated to determine the adhesive remnant index (ARI). Results: The SBS values were significantly higher for the monocrystalline brackets, when compared with the polycrystalline type (p< 0.0001), and significantly higher with three bleaching sessions than without bleaching (p< 0.0436). The ARI showed predominance of failures between the bracket and resin for all the groups (score 3). Conclusion: Three dental bleaching sessions increased the SBS values. Monocrystalline brackets showed higher SBS values than the polycrystalline type.
Highlights
Dental bleaching is an easy and conservative therapy for whiting teeth.[1,2] Dental bleaching can be performed at-home or in-office,[3,4,5] and the most common used substances are carbamide and hydrogen peroxide in various concentrations.[3,4]Patients willing to have white and aligned teeth have associated dental bleaching with orthodontic treatment,[6] undergoing the procedure before or after orthodontic treatment.[7]Adhesive used for bracket bonding may undergo degradation or solubility due to the presence of bleaching agents.[8]
The shear bond strength (SBS) values were significantly higher for the monocrystalline brackets, when compared with the polycrystalline type (p < 0.0001), and significantly higher with three bleaching sessions than without bleaching (p < 0.0436)
Polycrystalline ceramic brackets are composed of polycrystalline alumina, made up of aluminum oxide crystals fused at high temperatures, allowing various brackets to be molded simultaneously
Summary
Dental bleaching is an easy and conservative therapy for whiting teeth.[1,2] Dental bleaching can be performed at-home or in-office,[3,4,5] and the most common used substances are carbamide and hydrogen peroxide in various concentrations.[3,4]Patients willing to have white and aligned teeth have associated dental bleaching with orthodontic treatment,[6] undergoing the procedure before or after orthodontic treatment.[7]Adhesive used for bracket bonding may undergo degradation or solubility due to the presence of bleaching agents.[8]. Dental bleaching is an easy and conservative therapy for whiting teeth.[1,2] Dental bleaching can be performed at-home or in-office,[3,4,5] and the most common used substances are carbamide and hydrogen peroxide in various concentrations.[3,4]. Patients willing to have white and aligned teeth have associated dental bleaching with orthodontic treatment,[6] undergoing the procedure before or after orthodontic treatment.[7]. Patients who are concerned about esthetics during orthodontic treatment have the option of using monocrystalline or polycrystalline esthetic brackets.[10] Both types are composed of aluminum oxide,[11,12] with different manufacturing process. Polycrystalline ceramic brackets are composed of polycrystalline alumina, made up of aluminum oxide crystals fused at high temperatures, allowing various brackets to be molded simultaneously
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