One-year bleaching efficacy using two HP products with different pH: A double-blind randomized clinical trial

Area of Science:

• Dental Aesthetics
• Biomaterials Science

Background:

• In-office dental bleaching is a common cosmetic procedure.
• Hydrogen peroxide is the active agent in most bleaching products.
• The pH of hydrogen peroxide gels may influence bleaching efficacy and stability.

Purpose of the Study:

• To compare the 1-year bleaching efficacy of two hydrogen peroxide gels with different pH levels.
• To evaluate the color stability and rebound effect of in-office dental whitening treatments.

Main Methods:

• A split-mouth, double-blind, randomized clinical trial was conducted.
• Twenty-eight patients received bleaching with either an acidic (pH 2.0) or neutral (pH 7.0) hydrogen peroxide gel.
• Efficacy was assessed using subjective (shade guide units) and objective (spectrophotometry) measures up to 12 months post-treatment.

Main Results:

• Both acidic and neutral hydrogen peroxide gels produced similar color variations over 12 months.
• Subjective and objective assessments showed no significant differences between the two products.
• A slight color rebound was observed for both treatments after 12 months, without statistical significance.

Conclusions:

• In-office dental whitening using hydrogen peroxide gels with different pHs yields comparable 1-year results.
• The stability of tooth color and rebound effect are similar for acidic and neutral pH bleaching gels.
• Clinicians can achieve similar bleaching outcomes regardless of the hydrogen peroxide gel's pH.