Decomposition Rate, pH, and Enamel Color Alteration of At-Home and In-Office Bleaching Agents

Autor(es)

Vanessa Cavalli ^[1] ; Bruna Guerra da Silva ^[2] ; Sandrine Bittencourt Berger ^[3] ; Fabiano Carlos Marson ^[4] ; Cinthia Pereira Machado Tabchoury ^[5] ; Marcelo Giannini ^[6]

Afiliação do(s) autor(es)

^[1] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[2] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[3] Universidade Norte do Paraná. Department of Restorative Dentistry - Brasil

^[4] Dental Press Cursos - Brasil

^[5] Universidade Estadual de Campinas. Department of Physiological Sciences - Brasil

^[6] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Restorative Dentistry - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 30, n. 4, p. 385-396, 2019-07-22.

Resumo

Abstract This study evaluated the decomposition rate (DR), pH, enamel color alteration (DE) and whiteness index (DWI) promoted by at-home and in-office bleaching. Enamel surface was submitted to (n=10): at-home (10%, 15%, 20% carbamide peroxide - CP, 6% hydrogen peroxide -HP) and three 35% HP agents with light irradiation (LED, laser, and halogen) or no treatment (control). The DR and pH of agents were measured after 0, 2, 4, 6 and 8 h (at-home) or after 5, 15, 20, 30 and 40 min (in-office). Color parameters (L*, a*, b*, DE, DWI) were determined at baseline and after bleaching. DR, pH, L*, a*, b* data were analyzed by one-way (at-home) or two-way (in-office) repeated measures ANOVA and Tukey test. DE and DWI, by one-way (at-home) or two-way (in-office) ANOVA and Tukey test. DR of at-home agents was similar after 6 and 8 h (p>0.05), with pH close to neutral (6.5 to 6.9, CP) or acid 5.9 (6% HP). From 4 to 8 h, DE was higher for 15% and 20% CP compared with 10% CP (p<0.05). After 40 min, DR of 35% HP agents was similar and all exhibited significant DE in one application (p<0.05), regardless light irradiation. DWI indicated whitening effect with no differences among groups (p>0.05). One 35% HP showed alkaline pH, and the others, pH < 5.5. At-home agents could be applied for 2 h (15%, 20% CP, 6% HP) and 4 h (10% CP) and the in-office agents, up to 40 min in one application, without light. (AU)

• Processo FAPESP: 11/17507-5 - Avaliação in vitro do tempo de decomposição de diferentes concentrações do peróxido de hidrogênio e penetração na superfície do esmalte intacto e com restaurações existentes
• Beneficiário: Vanessa Cavalli Gobbo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado