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Efficacy of in‐office bleaching techniques combined with the application of a casein phosphopeptide‐amorphous calcium phosphate paste at different moments and its influence on enamel surface properties
Author(s) -
Gama Cunha Ana Gabriela,
Meira De Vasconcelos Adriana Alcantara,
Dutra Borges Boniek Castillo,
De Oliveira Vitoriano Jussier,
AlvesJunior Clodomiro,
Machado Claudia Tavares,
Dos Santos Alex Jose Souza
Publication year - 2012
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.22026
Subject(s) - enamel paint , hydrogen peroxide , amorphous calcium phosphate , casein , chemistry , nuclear chemistry , phosphopeptide , surface roughness , amorphous solid , dentistry , phosphate , materials science , food science , composite material , biochemistry , organic chemistry , medicine , kinase
OBJECTIVES: The aim of this in vitro study was to investigate the efficacy of in‐office bleaching technique combined with the application of a casein phosphopeptide‐amorphous calcium phosphate (CPP‐ACP) paste (MI Paste–MI) at different moments and its influence on enamel surface properties. METHODS: Eighty bovine dental crowns were randomly allocated into eight groups ( n = 10), and bleached with either 35% hydrogen peroxide (HP) or 37% carbamide peroxide (CP). Four different protocols of application of MI were considered: without MI, MI applied before bleaching, MI applied after bleaching, and MI applied both before and after bleaching. Bleaching effectiveness was measured by the VITA EasyShade spectrophotometer utilizing the CIEL*a*b* system (Δ E , Δ L *, Δ a *, and Δ b *). Color readings were measured at baseline, 7, 14, and 21 days. Hardness and roughness were measured at baseline (T0) and immediately after bleaching (T14). Data were subjected to the two‐way ANOVA for repeated measurements and Tukey's test at 5%. RESULTS: HP groups achieved the greatest color change. The application of a CPP‐ACP paste did not reduce the efficacy of bleaching peroxides. Samples bleached with CP showed decreased hardness at T14. Samples bleached with HP that received the application of MI before and before/after bleaching did not present hardness decrease at T14. Samples bleached with peroxides only and received MI after bleaching showed increased roughness at T14. CONCLUSIONS: The use of CPP‐ACP was able to prevent negative changes in roughness and hardness of bovine enamel when associated to hydrogen peroxide, and might be applied before/after the bleaching protocol. Microsc. Res. Tech. 75:1019–1025, 2012. © 2012 Wiley Periodicals, Inc.