The effect of Disodum Hydrogen Phosphat addition to white mineral trioxide aggregate on solubility in distilled water or synthetic tissue fluid

Abstract

Solubility of mineral trioxide aggregate (MTA) is one of the important features that can affect other properties such as microleakage and biocompatibility. Since adding Na2HPO4 has been enhanced biocompatibility and setting time of WMTA, the aim of this study was to evaluate the effect of adding Na2HPO4 to WMTA on the solubility of the mixture in distilled water or synthetic tissue fluid (STF). Materials & Methods: Twenty four specimens were prepared for each of WMTA and WMTANA groups (48 specimens totally). Then the samples in each group were divided into two subgroups to immerse in different solutions (distilled water and STF). The solubility of materials at periods of 2, 9, 14, 21, 30, 50, and 78 days after the begining of the study were measured by ISO standard (weight difference) method. One-way ANOVA and post hoc Tukey test were used to analysis the data. P<0.05 was assumed as significant. Results: The one-way analysis revealed the significant difference between experimental groups (P<0.05). Post hoc Tukey test revealed that the solubilirty of WMTA and WMTANA in distilled water was more than in STF (P<0.05); but there was not a significant difference between the solubility of WMTA and WMTANA neighter in STF nor in distilled water (P<0.05). Conclusions: WMTA solubility was less in STF than distilled water. Adding Na2HPO4 to WMTA did not affect its solubility