Concentrations of and application protocols for hydrogen peroxide bleaching gels: effects on pulp cell viability and whitening efficacy.

Clinical Relevance Verification that pH influences the bleaching efficacy will contribute to the development of more efficient bleaching products.

Influence of pH on the effectiveness of hydrogen peroxide whitening.

OBJECTIVE In-office bleaching gels are usually marketed in different pHs. This study is aimed at evaluating the efficacy, enamel surface morphology and concentration of hydrogen peroxide (HP) in the pulp chamber of teeth bleached with 40% HP with different pHs. MATERIALS AND METHODS Forty premolars were randomly divided according to bleaching gel pH: 5.1, 6.3, 7.0, and control (no bleaching). Teeth were prepared, an acetate buffer was placed in the pulp chamber and teeth were bleached with two 20-minutes applications. The amount of HP was determined on a UV-VIS spectrophotometer. Color change was assessed by using a digital spectrophotometer before and 1 week after bleaching treatment. Five additional premolars were divided into four parts, assigned to the same groups above for analysis under scanning electron microscope. Data were subjected to anova and Tukey's tests (alpha = 0.05). RESULTS The group pH 5.1 showed the highest HP diffusion in the pulp chamber (P < .001). No significant difference was detected in color change (P = .51). All groups presented the same pattern of enamel demineralization. CONCLUSIONS The bleaching agent with pH 5.1 presented the highest HP amounts in the pulp chamber, but color change and enamel morphology were similar among groups. CLINICAL SIGNIFICANCE Regardless of the pH, the bleaching effect can be observed in teeth submitted to high concentrations of HP, but a higher permeability of HP was found in the pulp chamber of teeth bleached with more acidic bleaching agents. Based on that, we suggest the use of alkaline gels for in-office bleaching to minimize damage to the pulpal tissue.

In-office bleaching with a commercial 40% hydrogen peroxide gel modified to have different pHs: Color change, surface morphology, and penetration of hydrogen peroxide into the pulp chamber.

Compositional, structural and mechanical comparisons of normal enamel and hypomaturation enamel.

Effect of different storage conditions on the physical properties of bleached enamel: An in vitro vs. in situ study

Effects of two in-office bleaching agents with different pH values on enamel surface structure and color: An in situ vs. in vitro study

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Effects of two in-office bleaching agents with different pH values on enamel surface structure and color: An in situ vs. in vitro study