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

Brazilian Dental Journal

Morgana Eli Vianna²  Danila M. Zilio¹  Caio Cezar Randi Ferraz¹  Alexandre Augusto Zaia¹  Francisco José De Souza-filho¹  Brenda Paula Figueiredo De Almeida Gomes¹ 

[1] ,University College London Eastman Dental Institute Unit of EndodontologyLondon,UK

关键词: intracanal medication;    calcium hydroxide;    pH;   

DOI  :  10.1590/S0103-64402009000500005

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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