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INVITED REVIEW
Year : 2008  |  Volume : 11  |  Issue : 4  |  Page : 141-143

The chemical composition of mineral trioxide aggregate


Department of Building and Civil Engineering, Faculty of Architecture and Civil Engineering, Department of Dental Surgery, Faculty of Dental Surgery, University of Malta, Malta

Correspondence Address:
Josette Camilleri
Department of Building and Civil Engineering, Faculty of Architecture and Civil Engineering, University of Malta, Msida MSD 2080
Malta
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-0707.48834

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Mineral trioxide aggregate (MTA) is composed of Portland cement, with 4:1 addition of bismuth oxide added so that the material can be detected on a radiograph. The cement is made up of calcium, silicon and aluminium. The main constituent phases are tricalcium and dicalcium silicate and tricalcium aluminate. There are two commercial forms of MTA, namely the grey and the white. The difference between the grey and the white materials is the presence of iron in the grey material, which makes up the phase tetracalcium alumino-ferrite. This phase is absent in white MTA. Hydration of MTA occurs in two stages. The initial reaction between tricalcium aluminate and water in the presence of calcium sulphate results in the production of ettringite. Tricalcium and dicalcium silicate react with water to produce calcium silicate hydrate and calcium hydroxide, which is leached out of the cement with time.


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