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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effect of Adhesive Restoration and Bleaching Technique on the Concentration of Hydrogen Peroxide In the Pulp Chamber

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Autor(es):
Cavalli, V. ; Silva, B. G. ; Berger, S. B. ; Abuna, G. ; Marson, F. C. ; Tabchoury, C. P. M. ; Giannini, M.
Número total de Autores: 7
Tipo de documento: Artigo Científico
Fonte: Operative Dentistry; v. 42, n. 2, p. E44-E54, MAR-APR 2017.
Citações Web of Science: 1
Resumo

This study aimed to quantify the concentration of hydrogen peroxide into the pulp chamber in the presence or absence of adhesive enamel restorations and to analyze the resin-dentin interface of bleached groups. Bovine incisors (120) were randomly divided into three groups according to enamel treatment (n=40 each): (1) enamel without restoration (control); (2) enamel cavities (3 mm diameter x 1.5 mm depth) restored with a silorane-based (SB) system; or (3) enamel cavities (3 mm diameter x 1.5 mm depth) restored with a dimethacrylate-based (DB) system. Restorations were thermocycled, and all groups were submitted to one application of 35% hydrogen peroxide (HP) agent for 45 minutes and subjected to four light activation methods (n=10 each): without light, lightemitting diode (LED), LED/diode laser, or halogen light. Acetate buffer solution was placed into the pulp chamber before bleaching, and this solution was collected to spectrophotometrically determine the concentration of HP that reached the pulp chamber after bleaching. Rhodamine B was added to the HP agent and applied on additional enamel samples of each group for 24 hours. Samples were sectioned mesiodistally, and the bleaching agent was traced using confocal microscopy. According to two-way analysis of variance and Tukey test (alpha=0.05), the HP concentration in the pulp chamber of the control group was significantly lower than that of the SB group (p < 0.05), regardless of light activation. No differences were observed between DB and SB groups and between control and DB groups, except for the DB halogen light activated group, which exhibited higher HP intrapulpal concentration (p < 0.05). Confocal microscopy exhibited HP diffusion through the interface of the SB and DB restored groups as well as enamel prisms in the control group. The SB restorative system increased the HP diffusion into the pulp chamber, but HP was able to diffuse even in the absence of enamel restorations. (AU)

Processo FAPESP: 14/22956-1 - 93rd General Session & Exhibition of the IADR 2015
Beneficiário:Vanessa Cavalli Gobbo
Linha de fomento: Auxílio à Pesquisa - Reunião - Exterior
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
Linha de fomento: Bolsas no Brasil - Pós-Doutorado