Author/Authors :
Mirhadi، Hossein نويسنده Department of Endodontics, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran; , , Moazzami ، Fariborz نويسنده Department of Endodontics, Dental school, Shiraz University of Medical Sciences, Shiraz, Iran , , Safarzade، Sareh نويسنده Student Research Committee, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran ,
Abstract :
Introduction: The purpose of this laboratory study was to evaluate the effect of acidic pH on the
sealing ability of calcium-enriched mixture (CEM) cement and mineral trioxide aggregate (MTA)
apical plugs. Methods and Materials: Seventy single-rooted human maxillary anterior teeth were
recruited. The teeth were randomly divided into 4 experimental groups (n=15), and 1 negative and
1 positive control groups of 5. The root canals were cleaned and shaped and the terminal 3 mm of
the roots were resected. Then MTA and CEM cement plugs were condensed in apical region with
3 mm thicknesses. The samples were exposed to pH values of 5.5 and 7.4. Leakage was evaluated
by the fluid filtration technique at 1, 7, 14, 30 day intervals. Data were analyzed by the repeated
measures MANOVA, one-way ANOVA and MANOVA/Bonferroni test. Results: Acidic pH
significantly reduced the sealing ability of MTA after 1, 14 and 30 days (P < 0.05). The rate of
microleakage in CEM cement samples in acidic pH was significantly greater than that in neutral
pH in day 30 (P < 0.05). There was no significant difference between the sealing property of MTA
and CEM cement at both pH levels (P > 0.05). Conclusion: It can be concluded that the CEM
cement exhibited similar sealing ability as MTA at both pH levels. In addition, an acidic pH
environment reduced the sealing ability of MTA and CEM cement after 30 days.
