Análise da rugosidade superficial de materiais restauradores estéticos. Efeito de agentes clareadores e tempo
Abstract
Este estudo in vitro avaliou o efeito de agentes clareadores na rugosidade superficial (Ra) de materiais restauradores estéticos, com o passar do tempo. Foram utilizadas duas resinas compostas, Z100 (M1) e Silux-Plus (M2), um compômero, Dyract (M3) e um ionômero de vidro modificado por resina, Vitremer (M4), que foram expostos a dois agentes clareadores: Opalescence (C1), peróxido de carbamida 10%, e Hi-Lite (C2), peróxido de hidrogênio 35% e como meio de imersão foi utilizada saliva artificial (Co). Foram confeccionados 120 corpos de prova, sendo a Ra avaliada após 1 hora de confecção; e antes da imersão em saliva artificial (T0), após 1dia (T1), 7 (T2), 15 (T3) e 30 (T4) dias de exposição aos agentes clareadores. No grupo controle, os corpos-de-prova ficaram somente imersos em saliva artificial. Após análise estatística de variância ANOVA (a = 5%), teste de Tukey, e método da decomposição da soma de quadrados, foi possível concluir que: 1 – a Ra dos materiais restauradores estéticos, de forma geral, alterou-se após exposição aos diferentes agentes clareadores e ao longo do tempo; 2 – em função do material restaurador, M2 apresentou a maior média de Ra, seguido em ordem decrescente por M4, M3 e M1; 3 – C1 e C2 exerceram ação sobre a superfície dos materiais restauradores aumentando a Ra para todos os materiais avaliados, principalmente em M2 e M4; 4 – em função do fator tempo, observou-se influência estatisticamente significativa sobre a Ra, pois quanto maior o tempo de exposição ao agente clareador, maiores os valores médios de Ra.
UNITERMOS: materiais dentários; odontologia estética; agentes clareadores.
SUMMARY
This “in vitro” study evaluated the effect of bleaching agents in the surface roughness (Ra) of esthetic restoring materials, with passing of the time. Two composite resins were used, Z100 (M1) and Silux-Plus (M2), a compomer, Dyract (M3) and a glass ionomer modified by resin, Vitremer (M4), that were exposed to two bleaching agents: Opalescence (C1), 10% carbamide peroxide, and Hi-Lite (C2), 35% hydrogen peroxide and as middle of immersion artificial saliva was used (Co). 120 specimens were made, being the Ra evaluated after 1 hour of making; and before the immersion in artificial saliva (T0), after 1day (T1), 7(T2), 15(T3) and 30(T4) days of exhibition to the bleaching agents. In the control group, it specimens them they were only immersed in artificial saliva. After statistical analysis of variance ANOVA (= 5%), Tukey’s test, and method of the decomposition of the sum of squares, was possible to end that: 1 – the Ra of the aesthetic restoring materials, in a general way, lost temper after exhibition to the different bleaching agents and along the time; 2 – in function of the restoring material, M2 presented the largest average of Ra, proceeded in decreasing order by M4, M3 and M1; 3 – C1 and C2 exercised action on the surface of the restoring materials increasing the Ra for all the appraised materials, mainly in M2 and M4; 4 – in function of the factor time, influence significant statistically was observed on the Ra, because as larger the time of exhibition to the bleaching agent, larger the medium values of Ra.
UNITERMS: dental materials; esthetics dental; bleaching agents.
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