Intra canal medicamentAtomic absorption spectrophotometer pH a b s t r a c t Aim: To evaluate the effect of different vehicles on pH and release of calcium ions from calcium hydroxide (CH) paste from apical third of root canals.Methods: 40 single rooted extracted human mandibular premolars were instrumented with RevoS files (MicroMega) up to ISO size 40. The teeth were divided into 4 groups on the basis of vehicle as follows: Group I -calcium hydroxide mixed with 2% chlorhexidine; Group II -calcium hydroxide mixed with propylene glycol; Group III -calcium hydroxide mixed with glycerine; and Control -calcium hydroxide mixed with double distilled water. Each group had two subgroups (n = 5) on the basis of the calcium hydroxide delivery. Subgroup A -calcium hydroxide paste placed with spiral filler (Lentulospiral) subgroup B -calcium hydroxide paste placed with flat wire filler (Paste Inject). pH and calcium ion release was evaluated at 24 h, 48 h, 7th day, 15th day and 30th day using a pH meter and atomic absorption spectrophotometer respectively.
Results:The calcium release from various groups was highest for CH+glycerine (Group III) followed by CH+chlorhexidine (Group I), CH+propylene glycol (Group II) and CH+double distilled water (control). At all the intervals the differences in calcium ion release among the groups were statistically significant ( p < 0.05), except on day 7. Delivery technique did not have a significant effect on calcium ion release. Highest pH values were recorded from CH +glycerine group at day 30 for both the delivery systems, however rise in pH from day 1 to day 30 were non-significant in all groups with both delivery systems.