Mineral Trioxide Aggregate (MTA) PPT

November 19, 2011 | By | Reply More

Mineral Trioxide Aggregate (MTA) PPT

PowerPoint lecture slide

Size: 2.81 MB



Mineral trioxide aggregate (MTA) was developed at the Loma Linda University, California, USA, as a root-end filling material in surgical endodontic treatment.

Paediatric dentistry is evident in its use as an apical barrier in immature non-vital teeth and in the coronal fragment of fractured roots, as a pulpotomy medicament in primary and permanent teeth, a pulp-capping agent in young permanent teeth, and as a repair material for perforation and resorptive defects.

Chemical and physical properties of MTA

Chemical composition:

1.Dicalcium silicate

2.Tricalcium silicate

3.Tricalcium aluminate


5.Tetracalcium aluminoferrite

6.Bismuth oxide



9.Chromophores (iron oxide)



physical properties of MTA :

  •  Setting/Hardening time:

2-3 Hours

In order to reduce the setting time, the effect of accelerators such as sodium phosphate dibasic (Na2HPO4) and calcium chloride (CaCl2) are Used.

  • Compressive strength:

The compressive strength of amalgam was higher than these materials. The compressive strength of MTA increased with time in presence of moisture.

  • Radiopacity:

Radiopacity is given by Bismuth  Oxide.

MTA is less radiopaque than Super EBA, IRM, amalgam, and conventional gutta-percha, but in the same range as zinc oxide–eugenol-based root canal sealers.

  • Setting conditions:

Exposure to moisture or humidity is required for the MTA to achieve optimum strength.

  • Solubility/Mixing:

Use of 0.33 g of water with 1 g of ProRoot MTA to achieve an optimum mix of the material.

  • Marginal adaptation and sealing ability:

better marginal adaptation to the root end cavity wall than other materials, and thus preventing microleakage.


Effect of MTA on the strength and hardness of root dentine:

Because these components act as ‘bonding agents’ between the collagen network and the hydroxyapatite crystals, so it has higher fracture resistance than calcium hydroxide & other materials.

  • Antibacterial  activity:

MTA has antibacterial effects against Enterococcus faecalis and Streptococcus sanguis.

  • Biocompatibility:

1.Minimal inflammatory responses in the soft tissue and bone

2.Inducing osteogenesis.

Clinical applications of MTA in paediatric dentistry:

Pulp treatment in permanent teeth:


(i) Pulp capping:

0.28-mm-thick dentine bridge in teeth pulp capped with grey MTA at 2 months, and 0.43 thickness at 6 months in contrast to a 0.15-mm-thick dentine bridge noted with calcium hydroxide at 6 months. MTA resulted in less pulpal inflammation and more predictable hard tissue barrier formation in permanent teeth in comparison to hard-setting calcium hydroxide. MTA seemed to heal the pulp tissue at a faster rate than calcium hydroxide cement.

Pulp treatment in primary teeth:

(i) Pulpotomy:

MTA to be an acceptable alternative to formocresol as a wound dressing in the pulpotomy of primary teeth.

(ii) Pulp capping:

that MTA was as successful as calcium hydroxide in direct pulp capping

Tags: , , , , , , , , , , , , , , , ,

Category: Dental, Powerpoint

WARNING: Any unauthorised use or reproduction of  www.neuronarc.com content for commercial or any purposes is strictly prohibited and constitutes copyright infringement liable to legal action.