Author/Authors :
Ghasemi, Negin Dental and Periodontal Research Center - Department of Endodontics - Dental School, Tabriz University of Medical Sciences, Tabriz , Rahimi, Saeed Dental and Periodontal Research Center - Department of Endodontics - Dental School, Tabriz University of Medical Sciences, Tabriz , Shahi, Shahriar Dental and Periodontal Research Center - Department of Endodontics - Dental School, Tabriz University of Medical Sciences, Tabriz , Milani, Amin Salem Department of Endodontics - Dental School, Tabriz University of Medical Sciences, Tabriz , Rezaei, Yashar Department of Dental Biomaterials - Dental School, Tabriz University of Medical Sciences, Tabriz , Nobakht, Mahnaz Dental School - Tabriz University of Medical Sciences, Tabriz
Abstract :
Introduction: The aim of this study was to evaluate the effect of adding propylene glycol
(PG) to mineral trioxide aggregate (MTA) liquid with volume ratio of 20% on the
compressive strength (CS) of MTA in two time periods (4 and 21 days) after mixing.
Methods and Materials: Four groups of steel cylinders (n=15) with an internal diameter
of 3 and a height of 6 mm were prepared and MTA (groups 1 and 2) and MTA+PG (80%
MTA liquid+20% PG) (groups 3 and 4) were placed in to the cylinders. In groups 1 and
3 the CS was evaluated after 4 days and in groups 2 and 4 after 21 days. Data were
calculated using the two-ways ANOVA. The level of significance was set at 0.05. Results:
The highest (52.22±18.92 MPa) and lowest (4.5±0.67 MPa) of CS was obtained in 21-day
MTA samples and 4-day MTA+PG specimen, respectively. The effect of time and PG were
significant on the CS (P<0.05). Mixing MTA with PG significantly reduced the CS; but
passing the time from 4 to 21 days significantly increased the CS. Conclusion: Considering
the limitations of this study, PG had a negative effect on CS of MTA.
