mineral trioxide agreegate

1. Sri Aurobindo college of dentistry
Department of pedodontics and preventive
dentistry

2. GUIDED BY-
• Dr. Bharat Bhushan Sir
• Dr. Khushboo Barjatya Mam
• Dr. Binti Rani Chand Mam
• Dr. Preene Juneja Mam
• Dr. Abhilasha M. Tripathi Mam
• Dr. Hariom Meena Sir
SUBMITTED BY-
Roshni Patil
Batch 2017-18
Roll No. 59

4. INTRODUCTION
 Mineral trioxide arregate (MTA) was originally
formulated to provide the physical properties , setting
requirements and characterstics necessary for an ideal
repair and medicament material.

5. •Mineral trioxide agrregate (MTA) is a fine
hydrophilic powder ,available in a single
use sachets of 1 gm . Some companies also
provide premeasured water sachets for
ease of use.

6. COMPOSITION OF MTA
MTA is a mechanical mixture of 3 powder ingredients .
Portland cement(75%)
Bismuth oxide (20%)
Gypsum (5%)
The composition of MTA includes:
Tricalcium silicate
Tricalcium aluminate
Tricalcium oxide
Silicate oxide
Bismuth oxide

7. TYPES OF MTA
 MTA is available in 2 types , based on the colour known as grey and white
 GREY MTA WHITE MTA
Contains tetracalcium aluminoferrite Ferrous oxide is replaced by ma
(ferrous oxide) which is responsible for
grey discoloration of teeth, so that is not
used with anterior teeth.
Large particles.
Longer setting time .
Greater compressive strength.

8. Manipulation and Setting reaction
 The MTA paste is obtained by mixing 3 parts of powder with 1 part
of water to obtain putty like consistency . Mixing can be done on
paper or on a glass slab using a plastic or metal spatula . This mix is
then placed in the desired location and condensed lightly with a
moistened cotton pellet .
 MTA has a pH of 10.2 immediately after mixing and increase to 12.5
after 3 hours of setting .
 The setting time of grey MTA is about 2 hours and 55 minutes and
for white MTA it is 2hours and 20 minutes

9. PROPERTIES OF MTA
 1. Compressive strength
compressive strength of MTA within 24 hours of mixing
was about 40.0 MPa and increases to 67.3 Mpa after 21
days .
In comparison grey MTA exhibit greater compressive
strength then white MTA .
2.PH
MTA has an initial ph of 10.2 that rises to 12.5 three hours
after mixing .

10.  Radio-opacity
 The mean radio opacity of MTA is 7.17 mm of equivalent
thickness of aluminium , which is sufficient to make it easy
to visualize radiographically .
Solubility
 Although the set MTA shows no sign of solubility , the solubility
might increase if more water is used during mixing .

11. Marginal adaptation and sealing
ability
 MTA expands during setting which may be the reason
for it’s excellent sealing ability. MTA thickness of about
4 mm is sufficient to provide a good.
Antibacterial and antifungal
property:
 The MTA cements have antibacterial and fungicidal
properties(because of high pH).

12. BIOCOMPATIBILITY:
 MTA found that it is not mutagenic and is much less cytotoxic
compared to super EBA and IRM .
 Genotoxicity tests of cells after treatment of peripheral lymphocytes
with MTA showed no DNA damage.On direct contact they produce
minimal or no inflammatory reaction in soft tissues.
Reaction with other dental materials
 MTA does not react or interfere with any other restorative material .
Glass Ionomer cements or composite resins ,used as permanent filling
material do not affect the setting of MTA when placed over it.

13. TISSUE REGENERATION:
 MTA is capable of activation of cementoblasts and
production of cementum.It consistency allows for the
overgrowth of cementum and also facilitates
regeneration of the periodontal ligament.
MINERALIZATION :
 MTA ,just like calcium hydroxide ,induces dentin bridge
formation.The hard tissue bridge formation next to MTA is
because of the sealing property, biocompatibility ,alkalinity
and other properties associated with this material.

15. 1. PULP CAPPING:
 MTA has been proposed as a potential medicament for
capping of pulps with reversible pulpitis because of it’s
excellent tissue compatibility.
2.NON VITAL PULPOTOMY:
 MTA was tested and found to be ideal material with low
toxic effects,increased tissue regenerating properties and
good clinical results.

16. 3.Vital pulpotomy (Apexogenesis):
 Apexogenesis is defined as amputation of coronal pulp
completely without inserting any thing into root canal
system . This procedure was used for vital teeth with
immature roots.
4.Root –end filling:
 Many materials have been used as root-end filling
agents but the main disadvantage is their failure to
prevent leakage and the lack of biocompatibility.MTA
treated teeth exhibited significantly less
inflammation,more cementum,formation and
regeneration of periradicular tissues.

17. 5.Apical plug :
 Conventional management of an immature non vital
permanent tooth is apexification .The purpose of
apexification is to obtain an apical barrier so as to
prevent the extrusion of the obturating material.An
MTA plug of 4 mm thickness placed at the apical
region is adequate to form a barrier,sealing the canal
from the periapical area.

18. 6.Obturation of the canal:
 MTA can be used to obturate the root canal of a
retained primary tooth where the succedaneous
permanent tooth is absent .
7.Repair of perforation:
Repairing requires a material that should be
biocompatible,should withstand moisture without
dissolving and should have good sealing ability.

19. 8.Repair of fractures:
A. HORIZONTAL ROOT FRACTURE:
The success rate of horizontal root frature treatment
depending on their location(cervical,middle &
apical).The root fracture located in the cervical and
middle thirds cause difficulty for treatment because
it is difficult for dental immbolisation, leading to
injury or even preventing the consolidation of the
fragments.
For these cases it is possible to strengthen the tooth with
an intra canal pin cemented with MTA.

20. B.VERTICAL ROOT FRACTURE:
 Vertical fracture has a very poor prognosis .
 To repair a vertical fracture,remove the root canal
filling material from the treated roots and bond the
pieces internally with composite bonded resins.
 After raising a flap,groove the entire vertical fracture to
the composite with a small bur under constant water
spray. Place the MTA in the groove,cover it with a
resorbable membrane ,and suture the soft tissue flap.

21. THANK YOU