Objectives: The pH values of external aqueous medium relative to the roots of 70 single rooted teeth filled with Ca(OH)2 in to various vehicles was evaluated in the present study.\nMethods and Material: After root canal instrumentation and smear layer removal the samples were randomly divided into three control groups (5 samples each) and six experimental groups (10 samples each). The control groups were water control, dissolution control and sealing control. Experimental groups were filled with: Group I- Ca(OH)2-Normal Saline; Group II- Ca(OH)2-Local Anesthetic; Group III- Ca(OH)2-Propylene Glycol; Group IV-Ca(OH)2-Camphorated paramonochlorophenol; Group V- Ca(OH)2-Glycerine and Group VI- Ca(OH)2 Plus Points (CHPP). All the samples were immersed in glass vialsââ?¬â?¢ containing distilled water maintained at 37Ã?°C. Digital pH meter was used to analyze the pH changes at specific time intervals up to 28 days. \nStatistical analysis used: Statistical evaluation was carried out using one way-Anova and Tukey HSD tests.\nResults: Results revealed that nonsetting Ca(OH)2 formulations produced significantly higher pH elevation than the Calcium Hydroxide Plus Points with Ca(OH)2ââ?¬â?? CMCP combination giving the highest values.\nConclusions: The results indicated that CMCP when used as a vehicle facilitates sustained release of hydroxyl ions from calcium hydroxide medicament in the root canal system.
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