Estudos "in vitro" e "in situ" do efeito de agentes clareadores contendo peroxido de carbamida sobre a microdureza de tecidos dentais higidos e desmineralizados

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

Nightguard vital bleaching with carbamide peroxide agent has become the most ffequent used treatment modality for improving esthetic appearance of teeth, because of its effectiveness and easy application for removing intrinsic and extrinsic stains ffom the teeth. As the bleaching of vital teeth involves the direct contact of the whitening agent on the outer enamel surface for an extensive period of time and due to the characteristics of the components of the bleaching product, changes in enamel and dentin superficial microhardness can occur. This study, composed by tive scientitic artic1es, had the following objectives: a) to in vitro evaluate the microhardi1ess of sound human enamel treated with two 10% carbamide peroxide bleaching materials at different time intervals; b) to in vitro evaluate the microhardness of sound human enamel treated with a 10% carbamide peroxide agent associated with two desensitizing dentiffices at different bleaching times; c) to in vitro evaluate the microhardness of sound human dentin treated with two 10% carbamide peroxide agents at different bleaching times; d) to in vitro evaluate the microhardness of sound human enamel exposed to different concentrations of carbamide peroxide agents at different bleaching times; e) to in situ evaluate the microhardness of sound and demineralized enamel and dentin submitted to treatment with a 10% carbamide peroxide for three weeks. According to the methodology employed in these studies, it was conc1uded that different carbamide peroxide bleaching materiaIs with the same concentration have different effects on the sound human enamel superficial microhardness. The use of desensitizing dentifrices associated with the treatment of a 10% carbamide peroxide bleaching agent could maintain or enhance the human enamel microhardness. Ten percent carbamide peroxide bleaching agents decrease the dentin microhardeness over time, but 14 days after the completion of the treatment, the baseline microhardeness values are recovered due to the remineralizing effect of artificial saliva. Different concentrations of carbamide peroxide bleaching agents decrease the enamel microhardness over time, but the artificial saliva presented a remineralizing effect after 14 days of the completion of the treatment, increasing the enamel microhardness. In the in situ study, the treatment with 10% carbamide peroxide agent can alter the microhardness of sound and demineralized enamel, although it does not seem to affect the microhardness of sound and demineralized dentin

ASSUNTO(S)

dentes saliva dentina odontologia - estetica branqueamento caries dentarias peroxidos esmalte dentario

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