Publicação: pH-changes during intracoronal bleaching: An in vivo study
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Objectives: This study aimed to measure pH changes during 14 days intracoronal bleaching with hydrogen peroxide/sodium perborate and carbamide peroxide/sodium perborate. Materials and methods: Twenty patients presenting endodontically treated central maxillary incisors with color alterations were divided in two groups (n = 10): Group CP + SP: 37% carbamide peroxide + sodium perborate paste; Group HP + SP: 30% hydrogen peroxide + sodium perborate paste. The pH values were measured using a digital microprocessor at different times: Baseline, 2, 7 and 14 days. Data were analyzed with two-way ANOVA followed by Tukey's test (α = 0.05). Results: ANOVA showed p < 0.00 which indicated significant difference between the groups. The mean values (± sd) and the results of the Tukey's test were: HP + SP/14 days-7.98 (±0.58)a; HP + SP/7 days-8.59 (±0.18)b; HP + SP/2 days-8.83 (±0.32)bc; HP + SP/Baseline-8.83 (±0.01)bc; CP + SP/Baseline-8.89 (±0.01)bc; CP + SP/14 days-9.11 (±0.58)cd; CP + SP/7 days-9.54 (±0.16)de; CP + SP/2 days-9.66 (±0.08) de. The group HP + SP resulted in significantly lower pH values compared with group CP + SP. Conclusion: It can be concluded that both associations showed alkaline pH values; however, there was significant reduction in the pH values of the 30% hydrogen peroxide associated with sodium perborate after 14 days. Clinical Significance: The association of hydrogen peroxide and carbamide peroxide with sodium perborate paste presented alkaline characteristics during the 14-day evaluated period. Thus, regarding pH changes, both associations can be considered safe as intracoronal bleaching agents.
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Bleaching agents, Intracoronal, Peroxides, pH, boric acid, drug derivative, hydrogen peroxide, perborate sodium, peroxide, tooth bleaching agent, urea, urea peroxide, adolescent, adult, analysis of variance, chemistry, clinical trial, controlled clinical trial, controlled study, dental procedure, drug combination, human, methodology, middle aged, nonparametric test, tooth pulp disease, Adolescent, Adult, Analysis of Variance, Borates, Drug Combinations, Humans, Hydrogen Peroxide, Hydrogen-Ion Concentration, Middle Aged, Statistics, Nonparametric, Tooth Bleaching, Tooth Bleaching Agents, Tooth, Nonvital, Urea, Young Adult
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Journal of Contemporary Dental Practice, v. 12, n. 2, p. 109-113, 2011.
