Physicochemical Properties of Root Canal Filling Materials for Primary Teeth.

This study evaluated physiochemical proprieties of a calcium hydroxide-based paste (Calen®) combined with a zinc oxide cement at different ratios (1:0.5, 1:0.65, 1:0.8 and 1:1). Materials were compared regarding setting time, pH variation, radiopacity, solubility, dimensional changes, flow and release of chemical elements. Data were analyzed statistically by ANOVA and Tukey's test (α=0.05). Longer setting time and higher dimensional changes and solubility values were exhibited by 1:0.65 and 1:0.5 ratios (p<0.05). The 1:0.5 and 1:0.65 ratios exhibited the highest pH values at all time points. All materials exhibited high radiopacity values. Significant differences were found only between 1:0.5 and 1:1 ratios for calcium and zinc release (p<0.05), whereas the amount of zirconium was similar among all groups (p>0.05). Considering the evaluated proprieties, combinations of Calen® paste with ZO at 1:0.5 and 1:0.65 ratios had the best results as root canal filling materials for use in primary teeth.

Physicochemical Properties of Root Canal Filling Materials for Primary Teeth

Abstract This study evaluated physiochemical proprieties of a calcium hydroxide-based paste (Calen(r)) combined with a zinc oxide cement at different ratios (1:0.5, 1:0.65, 1:0.8 and 1:1). Materials were compared regarding setting time, pH variation, radiopacity, solubility, dimensional changes, flow and release of chemical elements. Data were analyzed statistically by ANOVA and Tukey's test (α=0.05). Longer setting time and higher dimensional changes and solubility values were exhibited by 1:0.65 and 1:0.5 ratios (p<0.05). The 1:0.5 and 1:0.65 ratios exhibited the highest pH values at all time points. All materials exhibited high radiopacity values. Significant differences were found only between 1:0.5 and 1:1 ratios for calcium and zinc release (p<0.05), whereas the amount of zirconium was similar among all groups (p>0.05). Considering the evaluated proprieties, combinations of Calen(r) paste with ZO at 1:0.5 and 1:0.65 ratios had the best results as root canal filling materials for use in primary teeth.

Resumo O objetivo do presente estudo foi avaliar propriedades físico-químicas da pasta à base de hidróxido de cálcio (Calen(r)) combinado com diferentes proporções de óxido de zinco (OZ) (1:0,5 e 1:0,65, 1:0,8 e 1:1) (Calen(r) /OZ). Os materiais foram comparados quanto ao tempo de endurecimento, variação do pH, radiopacidade, solubilidade, alterações dimensionais, escoamento e liberação de elementos químicos. Os dados obtidos foram submetidos à análise de variância (nível de 5% de significância). Maior grau de endurecimento, valores de alterações dimensionais, e solubilidade foram encontrados para Calen(r) /OZ 1:0,65 e 1:0,5. Calen(r) /OZ 1:0,5 e 1:0,65, apresentaram os maiores valores de pH em todos os momentos. Todos os materiais apresentaram valores elevados de radiopacidade com diferenças significativas (p>.05). Foram encontradas diferenças significativas apenas entre Calen(r) /OZ de 1:0,5 e 1:1 na liberação de cálcio e zinco (p< 0,05), enquanto que a quantidade de zircônia foi semelhante entre todos os grupos analisados (p>.05). Em relação às propriedades avaliadas no presente estudo, as combinações de Calen(r) com óxido de zinco nas proporções 1:0,5 e 1:0,65 são mais adequadas como material obturador para os canais radiculares de dentes decíduos.