Concentration of hydrogen ions in several calcium hydroxide pastes over different periods of time

Autor(es)

Morgana Eli Vianna ; Danila M. Zilio ^[2] ; Caio Cezar Randi Ferraz ^[3] ; Alexandre Augusto Zaia ^[4] ; Francisco José de Souza-Filho ^[5] ; Brenda Paula Figueiredo de Almeida Gomes ^[6]

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 20, n. 5, p. 382-388, 2009-00-00.

Resumo

The purpose of this in vitro study was to measure the concentration of hydrogen ions (pH) of calcium hydroxide [(Ca(OH)2] pastes combined with different vehicles over 7 periods of time. The Ca(OH)2 was manipulated with the following vehicles: i: sterile water; ii: iodoform plus sterile water; iii: local anesthetics (Lydocaine 2% with 1: 100,000 epinephrine); iv: polyethyleneglycol; v: glycerin; vi: 2.0% chlorhexidine gel; vii: camphorated paramonochlorophenol (CMCP); viii: (CMCP) + glycerin; and ix: polyethyleneglycol plus CMCP. The pastes were made on a glass plate to toothpaste consistency and the pH was measured at the following times: 5 min, 1, 24, 48 h; 7, 14 and 28 days. The data were statistically analyzed (Kruskal-Wallis at p<0.05). At 5 min, 1 and 24 h, the pH of all tested pastes ranged from 13.05 to 11.16. At 48 h and 7 days the pH of all tested pastes ranged from 11.66 to 8.92. At 14 and 28 days almost all pastes had pH means lower than 10. In conclusion, the mean pH of all tested calcium hydroxide pastes decreased with the time. Pastes made with aqueous vehicles (especially with sterile water), followed by oily vehicles (especially with CMCP + glycerin), held the highest pH means over the periods of time tested. (AU)

• Processo FAPESP: 08/58299-3 - Estudo microbiológico e de endotoxinas em canais radiculares de dentes com necrose pulpar e lesão periapical e avaliação da atividade endotóxica de LPS isolados de canais radiculares infectados
• Beneficiário: Brenda Paula Figueiredo de Almeida Gomes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/58518-4 - Análise da microbiota de canais radiculares de dentes humanos infectados através da cultura, clonagem e sequenciamento do gene 16S rRNA
• Beneficiário: Brenda Paula Figueiredo de Almeida Gomes
• Modalidade de apoio: Auxílio à Pesquisa - Regular