Avaliação da infiltração de pigmentos na interface de restaurações dentais sob o efeito da termociclagem

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

The aim of this "in vitro" study was to evaluate quantitatively the microleakage on three high-density composite restorations, a medium-density one and amalgam restorations, with or without thennocycling. Sixty sound human molars freshly extracted for orthodontic or surgery reasons had their buccal and lingual faces sectioned into one hundred dental blocks. Cylindrical cavities of 1.85 :t 0.05 mm diameter by 1.5 mm depth were prepared with a special diamond bur. The blocks were randomly assigned to 10 test groups (n=lO). Each two groups were restored with a different material, and one of them was submitted to thennal stress. After thennocycling, the samples were immersed in methylene blue for 12 hours. Then, they were washed and dried. A 0.05 mm surface layer of the restorations was abraded to remove possible superficial die penetration in the restorative material. The samples were ground into powder and immersed in absolute alcohol, in order to dilute the methylene blue. They were centrifuged, and the floating solution was analyzed on a spectrophotometer to evaluate quantitatively the dye concentration. Results were statiscally analyzed by Kruskal- W allis test and Mann Withman test. For the non-thennocycled groups, the means of microleakage were (Ilg/ml): Amalgam - 4.279 (A); Solitaire - 4.148 (AB); P60 - 3.418 (ABC); Z250 - 3.184 (BC); SureFil - 2.890 (C). For the thennocycled groups, the means were: Amalgam - 7.572 (A); Solitaire - 5.471 (A); Z250 - 4.330 (AB); P60 - 3.418 (BC); SureFil- 2.779 (C). The thennocycling analysis presented no statistical significant differences among the themocycled and non-thennocycled groups, for each material tested

ASSUNTO(S)

espectrofotometria resinas dentarias

ACESSO AO ARTIGO

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