Evaluation of pH levels and calcium ion release in various calcium hydroxide endodontic dressings

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ObjectiveThe purpose of this study was to evaluate Ca2+ release and pH of 3 calcium hydroxide–based products used routinely as intracanal dressings, as well as the new gutta-percha points with calcium hydroxide.Study designThe pH and Ca2+ release were assessed using Calen with camphorated paramonochlorophenol, saline calcium hydroxide paste, LC paste (Lopes and Costa paste—calcium hydroxide with olive oil), and calcium hydroxide containing gutta-percha points. The materials were inserted in polyethylene tubes and immersed in deionized water. The pH variation and Ca2+ release were monitored periodically for 4 weeks.ResultsAfter 72 hours, materials 1 and 2 raise the pH from 9.6 and 8.2 to 11.4 and 11.3, respectively, while a small change was observed for materials 3 and 4. The calcium concentration released from materials 1, 2, 3, and 4 after 72 hours was 6.54, 4.98, 1.31, and 1.74 mg/dL, respectively.ConclusionCalen plus camphorated paramonochlorophenol and saline calcium hydroxide paste exhibited the highest calcium release and pH levels.

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