Restor Dent Endod.  2012 Nov;37(4):188-193.

Chemical characteristics of mineral trioxide aggregate and its hydration reaction

• Chang SW

Abstract

Mineral trioxide aggregate (MTA) was developed in early 1990s and has been successfully used for root perforation repair, root end filling, and one-visit apexification. MTA is composed mainly of tricalcium silicate and dicalcium silicate. When MTA is hydrated, calcium silicate hydrate (CSH) and calcium hydroxide is formed. Formed calcium hydroxide interacts with the phosphate ion in body fluid and form amorphous calcium phosphate (ACP) which finally transforms into calcium deficient hydroxyapatite (CDHA). These mineral precipitate were reported to form the MTA-dentin interfacial layer which enhances the sealing ability of MTA. Clinically, the use of zinc oxide euginol (ZOE) based materials may retard the setting of MTA. Also, the use of acids or contact with excessive blood should be avoided before complete set of MTA, because these conditions could adversely affect the hydration reaction of MTA. Further studies on the chemical nature of MTA hydration reaction are needed.

Keyword

Calcium hydroxide; Calcium silicate hydrate; Dicalcium silicate; Hydration; Mineral trioxide aggregate; Tricalcium silicate

MeSH Terms

Aluminum Compounds
Apexification
Body Fluids
Calcium
Calcium Compounds
Calcium Hydroxide
Calcium Phosphates
Drug Combinations
Durapatite
Glutamates
Guanine
Hydroxides
Oxides
Silicates
Silicic Acid
Zinc Oxide
Pemetrexed
Aluminum Compounds
Calcium
Calcium Compounds
Calcium Hydroxide
Calcium Phosphates
Drug Combinations
Durapatite
Glutamates
Guanine
Hydroxides
Oxides
Silicates
Silicic Acid
Zinc Oxide

Figure

• 

  Figure 1 Scanning Electron Microscope (SEM) image which shows the formation of tag-like structures in Ortho MTA-dentin interface and in dentinal tubules. (a) in Ortho MTA-dentin interface (×1,000); (b) in dentinal tubules (×1,000). Courtesy of Dr. Joon-Sang Yoo.

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