Can antioxidant treatment replace delay in bracket bonding? An in vitro study.

Autor: Zaki SS; Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, 35516, Mansoura, Egypt. shaimaa_saad@mans.edu.eg., Ghorab SM; Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura, Egypt., Tawfik MA; Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, 35516, Mansoura, Egypt., Shamaa MS; Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, 35516, Mansoura, Egypt.
Jazyk: angličtina
Zdroj: BMC oral health [BMC Oral Health] 2023 Apr 02; Vol. 23 (1), pp. 197. Date of Electronic Publication: 2023 Apr 02.
DOI: 10.1186/s12903-023-02894-3
Abstrakt: Background: Deterioration in shear bond strength has been reported after immediate bracket bonding following hydrogen peroxide bleaching. This study compared the effectiveness of three antioxidant agents, namely, alpha-tocopherol, green tea extract, and sodium ascorbate, in reversing the bleaching effect and as possible alternatives to delayed bonding.
Methods: A total of 105 extracted human premolars were arbitrarily assigned to 7 groups (n = 15 each), including group 1 as the unbleached control group and six experimental groups, which were bleached with 40% hydrogen peroxide in three sessions of 15 min each. In experimental group 2, bonding was performed immediately after bleaching, whereas in groups 3 and 4, bonding was delayed for 1 and 2 weeks, respectively; meanwhile, the specimens were immersed in artificial saliva at 37 °C. Groups 5, 6, and 7 were treated immediately after bleaching with 10% of alpha-tocopherol, green tea extract, and sodium ascorbate solutions, respectively, for 15 min. Specimens were processed using 500 thermal cycles between 5 and 55 °C, with a dwell time of 30 s after 24 h of bracket bonding, and then tested for shear bond strength. The adhesive remnant index was examined to evaluate fracture mode. One-way analysis of variance, Kruskal-Wallis H, and post hoc Tukey's honestly significant difference tests were used to compare the data. Significant results were subjected to pairwise comparisons with Bonferroni's correction-adjusted of p values ≤ 0.050.
Results: Shear bond strength was significantly lower (p < 0.001) in the immediate bonding and 1-week delay groups than in the control group. However, no significant difference was detected among the 2-week delay, antioxidant-treated, and control groups (p > 0.05).
Conclusions: Application of 10% alpha-tocopherol, green tea extract, or sodium ascorbate for 15 min could restore shear bond strength after 40% hydrogen peroxide bleaching as an alternative to delay in bracket bonding.
(© 2023. The Author(s).)
Databáze: MEDLINE
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