Mineral Trioxide Aggregate (MTA) PPT
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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
9.Chromophores (iron oxide)
physical properties of MTA :
- Setting/Hardening time:
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 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.
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.
1.Minimal inflammatory responses in the soft tissue and bone
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:
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