Influência dos agentes clareadores e um refrigerante a base de cola na microdureza do esmalte dental e a ação da saliva na superfície tratada
Abstract
O objetivo deste estudo foi avaliar os efeitos de três agentes clareadores e uma bebida carbonatada, à base de cola, sobre a microdureza do esmalte dental, assim como os efeitos da saliva artificial sobre o esmalte tratado com estes agentes. Foram utilizados quarenta dentes incisivos bovinos embutidos em resina acrílica. As amostras foram avaliadas em microdurômetro (Future Tech FM 700) após a divisão em quatro grupos, uma leitura inicial da microdureza serviu como controle do experimento: Grupo 1: peróxido de carbamida a 10% (Whiteness Perfect – FGM); Grupo 2: refrigerante Coca-Cola; Grupo 3: peróxido de carbamida a 37% (Whiteness Super – FGM); Grupo 4: peróxido de hidrogênio a 35% (Whiteness HP – FGM). Os dados foram submetidos aos testes estatísticos ANOVA e Tukey. Conclui-se que os agentes clareadores não diminuíram a microdureza do esmalte; a exposição à Coca-Cola diminuiu significantemente a microdureza do esmalte; o tempo de exposição aos agentes foi significante apenas para a Coca- Cola; o armazenamento em saliva aumentou a microdureza do esmalte exposto ao peróxido de carbamida a 37%; à Coca-Cola e ao peróxido de hidrogênio à 35%.
UNITERMOS: esmalte dentário, microdureza, clareamento dentário; saliva artificial; Coca-Cola.
SUMMARY
The purpose of this study was to evaluate the effect of 3 bleaching agents and a carbonated soft drink on dental enamel microhardness as well as the artificial saliva effect on enamel submitted to these chemical agents. Forty fresh bovine incisive teeth were used. They were embedded in acrylic resin, exception made to test facial surfaces. After samples were divided into 4 groups, baseline microhardness measurements were taken with a microdurometer (Future Tech – FM 700) ,that were used as experimental controls: Group 1: 10% carbamide peroxide (Whiteness Perfect – FGM); Group 2: soft drink Coca-Cola; Group 3: 37% carbamide peroxide gel (Whiteness Super – FGM); Group 4: 35% hydrogen peroxide (Whiteness HP – FGM), Data were submitted to ANOVA and Tukey’s. Conclusions were that bleaching agents did not lessen enamel microhardness; samples exposition time to Coca- Cola significantly reduced enamel hardness; 37ºC artificial saliva storage increased samples enamel microhardness after previous 37% carbamide peroxide, Coca-Cola and 37% hydrogen peroxide exposures.
UNITERMS: Dental enamel, microhardness, tooth bleaching; artificial saliva; Coca-Cola.
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