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

Shaimaa S Zaki¹, Sayed M Ghorab², Marwa A Tawfik³

¹Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, 35516, Mansoura, Egypt. shaimaa_saad@mans.edu.eg.

BMC Oral Health

|April 3, 2023

Summary

Antioxidants like alpha-tocopherol, green tea extract, and sodium ascorbate can restore bracket bond strength after hydrogen peroxide bleaching. These agents offer an effective alternative to delaying orthodontic bracket bonding.

Keywords:

Alpha-tocopherol Antioxidants Bleaching Green tea Shear bond strength Sodium ascorbate

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Area of Science:

Dental Materials Science
Orthodontic Adhesion
Biomaterials

Background:

Hydrogen peroxide bleaching can compromise shear bond strength in immediate bracket bonding.
This study investigates methods to mitigate bond strength reduction post-bleaching.

Purpose of the Study:

To compare the effectiveness of alpha-tocopherol, green tea extract, and sodium ascorbate in reversing the negative effects of hydrogen peroxide bleaching on bracket bond strength.
To evaluate these antioxidants as alternatives to delayed bracket bonding.

Main Methods:

105 human premolars were divided into 7 groups, including a control and bleached groups.
Bleached teeth underwent immediate bonding, delayed bonding (1-2 weeks), or immediate treatment with 10% alpha-tocopherol, green tea extract, or sodium ascorbate.
Specimens were subjected to thermal cycling and tested for shear bond strength and adhesive remnant index.

Main Results:

Immediate bonding and 1-week delayed bonding significantly reduced shear bond strength compared to the control.
No significant difference in shear bond strength was observed in the 2-week delay group, antioxidant-treated groups, and the control group.

Conclusions:

10% alpha-tocopherol, green tea extract, and sodium ascorbate effectively restore shear bond strength after hydrogen peroxide bleaching.
These antioxidant treatments serve as viable alternatives to delaying bracket bonding, optimizing orthodontic treatment protocols.