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Material guide

MTA (Mineral Trioxide Aggregate)

By the Dental Nation clinical team — a licensed dental group practising in the UAE

MTA is a calcium-silicate material used to repair roots, seal perforations and provide an apical fill in endodontic treatment.

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The short answer

MTA is a calcium-silicate bioceramic used for root repair, perforation sealing and apical filling during endodontic treatment.

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MTA (Mineral Trioxide Aggregate) dental educational illustration

What is MTA?

Its main component is tricalcium silicate, and bismuth oxide makes the material radiopaque on radiographs.

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Main parts of MTA
PartRole
Tricalcium silicatePrimary material[1][2]
Bismuth oxideMakes the material radiopaque[1][2]

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What happens after MTA is mixed?

Water activates MTA. The resulting mixture is highly alkaline, with a reported pH of 12, as calcium-silicate hydrates form and grow from the particles.

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Where can MTA be used?

MTA is used for root repair, filling the root end, sealing perforations and endodontic sealing. Bioceramics are also used as aids in regeneration.

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How does MTA relate to other bioceramics?

Endodontic bioceramics include calcium-phosphate, calcium-silicate and mixed calcium-silicate-phosphate groups. MTA belongs in the calcium-silicate group.

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Can MTA be relevant to discomfort after treatment?

Randomized-trial evidence has been systematically reviewed for MTA and postoperative pain after non-surgical endodontic treatment.

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What safety properties are reported?

Bioceramics used in endodontics are reported as biocompatible, non-toxic, dimensionally stable and bio-inert. Their similarity to hydroxyapatite and osteoconductive activity are also reported.

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Reported properties relevant to MTA
PropertyWhat it means
RadiopacityBismuth oxide allows radiographic visibility[1][2]
Dimensional stabilityReported for endodontic bioceramics[2][3]

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Frequently asked questions

Why is MTA visible on an X-ray?

Bismuth oxide is included as a radiopaque powder, so the material can be seen on radiographs.

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Keep reading

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Who wrote this page

This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.

This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.

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