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KMID : 0362720120500030148
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Journal of the Korean Dental Association
2012 Volume.50 No. 3 p.148 ~ p.155
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Chemical and physical properties and biocompatibility of MTA
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Chang Seok-Woo
Oh Tae-Seok
Yoo Heyon-Mee
Park Dong-Sung
Bae Kwang-Shik
Kum Kee-Yeon
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Abstract
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Mineral trioxide aggregate (MTA) is mainly composed of lime and silica. Its four major phases are tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracaclcium aluminoferrite. MTA has relatively long initial setting time (2h 45m) and various additives can be added to reduce setting time. Compressive strength of MTA increases with time and reaches 100 MPa after 28 days. MTA has high pH of 9-12.5 because of the formation of calcium hydroxide during its hydration reaction. MTA has superior sealing ability to amalgam and IRM when it is used in perforation repair or root end filling. MTA is safe in cytotoxicity and genotoxicity and have potential to promote pulpal and periapical hard tissue formation.
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KEYWORD
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biocompatibility, compressive strength, Mineral Trioxide Aggregate (MTA), pH, sealing ability, setting time
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