ABSTRACT
Objetivo: Avaliar o pH e liberação de íons cálcio dos materiais forradores a base de hidróxido de cálcio não fotopolimerizável (Hydro C), um fotopolimerizável (Biocal) e MTA. Os materiais foram manipulados e inseridos em tubos de 1 cm de comprimento e 1 mm de diâmetro. Os tubos foram preenchidos e imediatamente imersos em frascos contendo 10 mL de água deionizada. Os tubos foram removidos dos frascos depois de 10 minutos, 24, 48 horas, 7, 15 e 30 dias, e a liberação de íons cálcio e hidroxila foi mensurada com um pHmetro e espectrofotômetro de absorção atômica, respectivamente. Os dados foram comparados pela análise de variância a dois critérios, e as comparações individuais pelo teste de Tukey-Kramer, com nível de significância de 5%. Com relação a liberação de íons calcio, no periodo de 10 minutos ocorreram diferenças significantes (P<0,05) nas comparações do MTA com os outros dois materiais. Nos períodos de 24 e 48 horas os três materiais se diferenciaram estatisticamente (P<0,05) entre si. Na análise de 7 e 15 dias ocorreram diferenças significantes (P<0,05) nas comparações entre: MTA e Biocal, e no confronto entre Hydro C e Biocal. Na avaliação de 30 dias as diferenças significantes (P<0,05) ocorreram nas comparações do MTA com os demais materiais. Com relação ao pH, no período de 10 minutos e 24 horas não ocorreram diferenças significantes (P>0,05). Nos períodos de 48 horas ocorreu diferença estatística (P<0,05) nas comparações do BioCal com os outros dois materiais. Na análise de 7 dias ocorreu diferença significante (P<0,05) na comparação entre MTA e Biocal. Na avaliação de 15 dias ocorreram diferenças significantes (P<0,05) na comparação do Hidro C com os demais materiais. Na análise de 30 dias ocorreram diferenças significantes (P>0,05) nas comparações. Conclui-se que todos os materiais foram capazes de liberar íons cálcio e hidroxila.
Objective: Evaluate the pH and calcium ion release from the pulp-capping materials based on calcium hydroxide does not light-cured (Hydro), a light-cured (Biocal) and MTA. The materials were manipulated and inserted into tubes of 1 cm in length and 1 mm in diameter. The tubes were completed and immediately immersed in vials containing 10 mL of deionized water. The tubes were removed from bottles after 10 minutes, 24, 48 hours, 7, 15 and 30 days, and calcium and hydroxyl ions release was measured with an atomic absorption spectrophotometer and pHmetro, respectively. The data were compared by analysis of variance on two criteria, and individual comparisons by Tukey-Kramer test with significance of 5%. Regarding the calcium ion release, in period of 10 minutes there were significant differences (P<0 .05) MTA comparisons with the other two materials. During periods of 24 and 48 hours the three materials have differentiated statistically (P<0 .05) among themselves. Analysis of 7 and 15 days there were significant differences (P<0 .05) in the comparisons between: MTA and the confrontation between Biocal and Hydro C and Biocal. 30 days evaluation of significant differences (P<0 .05) occurred in MTA comparisons with other materials. With regards to pH, within 10 minutes and 12:0 am not significant differences occurred (P>0 .05). During periods of 48 hours there was statistical difference (P0 .05) in BioCal's comparisons with the other two materials. In During periods of 48 hours there was statistical difference (P<0 .05) in BioCal's comparisons with the other two materials. Analysis of 7 days there was significant difference (P<0 .05) in the comparison between MTA and Biocal. In 15 days trial significant differences occurred (P<0 .05) in comparison with the other's Hydro C materials. In the analysis of significant differences occurred 30 days (P<0 .05) in the comparisons. It is concluded that all materials were able to release calcium ions and hydroxyl.