Effect of thermal treatment on physico-chemical properties of white mineral trioxide aggregate synthesized from limestone precipitate calcium carbonate

This study reports the preparation of white mineral trioxide aggregate (WMTA) using precipitate calcium carbonate (PCC) by sol-gel method at various thermal treatments 900, 1100, and 1300 °C. The composition of WMTA included PCC (55 CaO), C6H16O3Si-TEOS (21 SiO2), Al(NO3)3⋅9H2O (2 Al2O3), and Bi2O3. WMTA 1100 with the highest purity was proven by the presence of C3S, C3A, and α-Bi2O3 phase in X-ray diffraction patterns. Results show that based on the SEM image WMTA 1100 formed a smaller crystal agglomeration (6-8 µm) and FTIR analysis found Bi-O (BiO3) vibration in Bi2O3 at 1100 and 950 cm-1, a characteristic of the β-C2S phase. The radiopacity value of WMTA 1100 resembles ProRoot MTA, namely 6.86±0.36 millimeters of aluminum (mm Al). WMTA 1100 gives the highest compressive strength, smallest solubility, highest pH, and calcium levels in comparison to WMTA 900 and WMTA 1300. © 2021 Trans Tech Publications Ltd, Switzerland.