Mineral trioxide aggregate And biodentine

1. Mineral trioxide aggregate
And
biodentine
By Dr Aisha muwafaq

2. Mineral trioxide aggregate (MTA) was developed for use as a dental
root repair material by Dr. Mahmoud Torabinejad, it is the most
commonly recommended material for sealing communications
between the root canal system and the periodontium.
Mineral trioxide aggregate (MTA)

3. MTA COMPOSITION
 75 % Portland cement
 20 % bismuth oxide (Bi203)
 5% calcium sulfate dihydrate or gypsum (CaSO4 · 2H20)
Additional minor trace elements may also be present .
Portland cement -based endodontic material |- MTA, coined
from the three oxides present in portland cement namely -
calcia , silica ,alumina.
CLINICAL APPLICATIONS OF MTA

4. Types of Mineral trioxide aggregate
GrayMTA Contains Ferrous oxide which causes
gray discoloration. *Not used with anterior
teeth. Large particles Longer setting time
Greater compressive strength
White MTAFerrous oxide is replaced by
Magnesium oxide, so no tooth discoloration.
Smaller particles Shorter setting time Less
compressive strength

5. Mixing MTA
 Prepared immediately before use.
 Kept always in closed containers or free from moisture.
 Powder: Water = 3:1
 Glass or paper slab used for mixing with – plastic/ metal spatula.
 It requires moisture to set. Once the mix is dry sandy form its
ready for application.

6. Mechanismof action
When MTA is placed in direct contact with human tissues it :
Creates an
antibacterial
environment by
it's alkaline PH
Modulate
cytokine
production
Encourages
differentiation
of hardtissue
producing cells
Forms
hydroxyapatite
on the MTA
surface and
provides a
biological seal

7. Characteristics
of MTA
biocompatible
antimicrobial
Non-resorbable
Minimal leakage
Compressive
strength develops
over a period of 28
days more than 133
MTA
Low or no
solubility
PH: initially- 10.2.
After 3 hours -12.5
(remains
constant)
Set in the
presence of
moisture
radioopaque
Setting time
About 2 hours
and 45 min

8. Biocompatibility
MTA is a biocompatible material with good sealing ability
Generatelittle or no
inflammatory
response in
periarticular tissue
Encourage the
formation of
fibrousconnective
tissue
Formation of
cementumcovering
the entire root end
Ca & p are the
mainionspresent
in thismaterial
whichare
thecomponentsof
dental tissue

9. Sealing ability
MTA expands
during setting
reaction
In presence of
moisture
Sealing ability
of MTA is
increased
excellent
sealing ability
Moistened cotton pellet should be placed in contact with MTA
before placement of the permanent restoration

10. Setting Time
 MTA powder consists of fine hydrophilic particles.
 Hydration of MTA powder results in a colloidal gel that
solidifies to a hard structure in ~ 4 hrs which has a long
setting time.
 MTA has long setting time with less shrinkage.

11. calcium silicate based product which became commercially available in
2009 by septodont and that was specifically designed as a “ dentine
replacement “ material
BIODENTINE COMPOSITION
Fine Hydrophilic powder composed of
modified powder composition of MTA.
Biodentine is available as powder in a
capsule and liquid in a pipette.
Biodentine

12. BIODENTINE COMPOSITION
Powder
Packaged in capsule 0.7g Tricalcium silicate( main core material)
• Dicalcium silicate
Liquid packged in pipette 0.18 ml
• Calcium carbonate
• Iron oxide (shade)
• Zirconium oxide(radiopacity)
• Calcium chloride(accelerator)
• Hydrosoluble polymer (water reducing agent, faster setting) Water

13. CLINICAL APPLICATIONS OF BIODENTINE

14. MANIPULATION
• The powder is mixed with the liquid in a capsule in the
triturator for 30 seconds 1 capsule powder: 5 drops of
liquid
• Setting time: Approximately 12 min

15. Mechanismof action
The reaction of the powder
with the liquid leads to
The setting and hardening
of the cement
The hydration of the tri-
calcium silicate leads to
The formation of a hydrated
calcium silicate gel and calcium
hydroxide

16. Mechanismof action
Mineralisation osteodentine reparative dentine
succesful pulp therapies due to release of Ca
Differentiation
Proliferation
Mineralisation of
pulp cells

17. Characteristics
of biodentine
biocompatible
antimicrobial
Non-resorbable
Minimal leakage
Compressive
strength 220 Mpa
with time it
reaches 300 Mpa
Low or no
solubillity
HP: during
setting phase of
increases to 12
Has the least
wash-out
resistance
radioopaque
Sitting time 12
min

18. BIODENTINE
MTA
1capsule powder:5 drops of liquid
3:1
P:L RATIO
In amalgamator for 30 sec.
Manually on glass slab with mixxing
spatula
MANIPULATION
Initial – 6
Final – 10-12
Initial – 70
Final - 175
SETTING TIME
2.26
1.88
DENSITY(g/cm3)
6-8
22.6
POROSITY(%)
131.5 (1 hr.)
241.1 (24 hr.)
- (1hr.)
7.5(24 hr.)
COMPRESSIVE STRENGTH(Mpa)
higher
lower
MECHANICAL RESISTANCE
Better than MTA
excellent
SEALING ABILITY
More soluble
Less soluble
SOLUBILITY
MTA & BIODENTINE