Abstract
Background: Several materials had been used as intracanal dressing to stimulate hard tissue formations during apexification procedure. Recently, a single appointment technique by using mineral trioxide aggregate (MTA) has been proposed as an alternative to the multiappointment calcium hydroxide apexification. The aim of this study was to evaluate the release of calcium and hydroxyl ions from calcium hydroxide paste and MTA through three different apical aperture sizes during pexification procedure. Materials and Methods: The root canals of sixty extracted premolar teeth were instrumented to a master apical file No. 100, 120, and 140 and filled with either calcium hydroxide paste or MTA. Calcium ions concentrations and pH values of the surrounding media were measured at days 1, 3, 7, 14, 21, and 28 of the test period. Results: Calcium ions concentrations and pH values of Ca(OH)2 were more than that of MTA at days 1, 3, and 7, then the calcium ions concentrations of MTA increased with time and became more than that of Ca(OH)2 which decreased with time. Ca+2 and OH-1 release from Ca (OH)2 paste and MTA increased with larger apical aperture size at all time intervals. Conclusions: MTA maintains a continuous calcium and hydroxyl ions release for longer time than that of Ca (OH)2 paste.
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