A comparative study of the effects of two carbamide peroxide bleaching agents on the structure of enamel

Abstract

ObjectiveConsidering that different sources of carbamide peroxide bleaching agent may cause greater or lesser damage to the enamel and may have reduced effectiveness in dental whitening, the aim of this study was to compare the effects on the structure of enamel of two bleaching agents, drugstore-compounded and commercial carbamide peroxide bleaching agents. Methods The specimens in the first group (drugstore-compounded carbamide peroxide) and second group (commercial carbamide peroxide) were treated with to 16% carbamide peroxide for 4 h per day for 20 days. The third group served as a control and was kept in artificial saliva during the test period. After the treatments, all specimens were examined via scanning electron microscopy. ResultsChanges in the enamel morphology were similar in both experimental groups, but these changes were greater than those observed in the control group. The changes were mild and included only pores. ConclusionThere were no differences regarding damage to the enamel between drugstore-compounded and commercial carbamide peroxide bleaching agents.

Efeitos do uso de produtos clareadores de autoaplicação sobre a superfície de uma resina composta nanoparticulada

“…Na literatura, é observada grande controvérsia em relação aos efeitos de diferentes concentrações de agentes clareadores na estrutura do esmalte e dos diferentes materiais restauradores, sendo os produtos mais utilizados para clarear os dentes à base de peróxido de hidrogênio e peróxido de carbamida 5 . Em relação a sua eficácia, evidências apontam para a difusão destes peróxidos dentro e através do esmalte para a junção amelodentinária e as regiões da dentina, e à medida que se difundem, reagem com macromoléculas escurecidas presentes, conduzindo a uma alteração estrutural destas, promovendo assim, o clareamento dental.…”