Effect of dental bleaching after bracket bonding and debonding using three different adhesive systems

Area of Science:

• Dental materials science
• Orthodontics
• Cosmetic dentistry

Background:

• Orthodontic treatment involves bracket bonding and debonding.
• The impact of these procedures on the efficacy of at-home tooth whitening is not fully understood.
• Different adhesive systems may influence the interaction between bracket procedures and bleaching outcomes.

Purpose of the Study:

• To investigate how bonding and debonding orthodontic brackets affect dental in-home bleaching.
• To compare the effects of three distinct adhesive systems on tooth whitening efficacy.
• To determine the short-term and long-term influence on bleaching outcomes.

Main Methods:

• Forty-four bovine incisors were grouped based on primer systems for bracket bonding.
• Teeth underwent staining, followed by 10% carbamide peroxide bleaching over two weeks.
• Digital images were analyzed using color coordinate values (L*a*b*) and color difference (ΔE') at multiple time points.

Main Results:

• After 7 days of bleaching, experimental groups showed significantly less whitening compared to the control.
• No significant color differences were observed between groups after 14 days of bleaching, particularly regarding lightness (L*).
• Statistical analysis (ANOVA and Tukey) indicated significant differences at p < 0.01.

Conclusions:

• Bonding and debonding orthodontic brackets alter initial tooth whitening outcomes within the first 7 days.
• The adhesive primer system used does not influence the long-term (14-day) effectiveness of 10% carbamide peroxide in-home bleaching.
• The effects on tooth whitening are temporary and do not impact the final results after two weeks of treatment.