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Year : 1992  |  Volume : 4  |  Issue : 2  |  Page : 5-10

An evaluation of the pH changes of calcium hydroxide using three vehicles in endodontic therapy - An in vitro study

1 Dean, Professor & Head, Department of Conservative Dentistry, Nair Hospital Dental College, Bombay, India
2 Clinical Assistant & Postgraduate student, Depart-ment of Conservative Dentistry, Nair Hospital Dental College, Bombay, India

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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0970-7212.347242

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Two common vehicles used with calcium hydroxide Ca(OH)2 are normal saline and camphorated parachlorophenol (CMCP). The use of propylene glycol as a vehicles was reported by Laws in 1962, but has not gained favour among endodontists. This in-vitro study was undertaken to evaluate the effect of mixing vehicles on the pH of calcium hydroxide pastes prepared in propylene glycol, camphorated parachlorophenol and normal saline. It was found that a paste of Ca(OH)2 and propylene glycol produced a consistently higher pH over a period of 2 weeks than a paste of Ca(OH)2 and normal saline solution. A Ca(OH)2- propylene glycol paste produced a mean pH of 10.92 at 24 hours which is higher than the pH produced by the other two pastes at any time. 10.2 is the optimal pH for the activity of alkaline phosphatase responsible for reparative activity at the apex. Hence this paste may be a better vehicle for clacium hydroxide.

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