Effect of sodium ascorbate on the shear bond strength of orthodontic brackets to bleached enamel using universal dental adhesive

Sadeghian, Saeid; Fathpour, Kamyar; Biglari, Mahshid

doi:10.4103/1735-3327.369630

Cited by 2 publications

(1 citation statement)

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“…However, following bleaching, free radicals and residual peroxides on the enamel surface impede the production of resin tags and the polymerization of resin monomers during the bonding process, resulting in decreased shear bond strength (SBS). 6 7 The bonding of orthodontic brackets to the enamel is the most intricate phase of orthodontic treatment, and the SBS plays an important role. The SBS is one of the main factors to consider in the use of adhesive materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Desensitizer Treatments on the Shear Bond Strength of Orthodontic Metal Brackets Following In-Office Bleaching: An In Vitro Study

Ambersari,

Karunia,

Alhasyimi

2023

Eur J Dent

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Objective One of the adverse effects of in-office bleaching is tooth hypersensitivity, which could be neutralized with a desensitizing agent. In-office bleaching and the application of desensitizing agents will affect the morphology of the enamel surface. These morphological changes have potential effects on the shear bond strength (SBS) and bonding of orthodontic brackets. This study analyzed the effects of fluoride and nonfluoride desensitizing agents after in-office bleaching on the SBS of metal brackets with resin composite cementation. Materials and Methods Twenty-seven postextraction premolars (n = 27) were bleached with 37% hydrogen peroxide and then divided into three groups: control group (group 1), fluoride-based desensitizing agent (group 2), and nonfluoride-based desensitizing agent (group 3). After treatment, the brackets were bonded using Transbond, and then the SBS test was performed using a universal testing machine. The adhesive remnant index (ARI) was analyzed after the SBS test, whereas enamel morphological changes were observed under a scanning electron microscope. After this assessment, energy-dispersive X-ray spectroscopy was conducted to determine calcium and phosphorus elements in the enamel surface after treatments. SBS data were analyzed using the one-way analysis of variance, followed by the Tukey test, whereas ARI scores were subjected to the Kruskal–Wallis test and the Mann–Whitney test with a significance level of 5%. Results The SBS increased significantly in group 2 compared with groups 1 and 3 (p < 0.05). In group 2, an ARI of 2 (55.56%) was frequent, whereas in group 3, an ARI of 3 (55.56%) appeared most frequently. Conclusion The application of the desensitizing agent fluoride after in-office bleaching increased the SBS and more adhesive remains on the tooth surface compared with that when nonfluoride desensitizing agents were applied on metal brackets with composite resin cementation.

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Section: Introductionmentioning

confidence: 99%