Mta and biodentine

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 Gray MTA Contains Ferrous oxide which causes gray discoloration. *Not used with anterior teeth. Large particles Longer setting time Greater compressive strength White MTA Ferrous 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. Mechanism of 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 hard tissue producing cells Forms hydroxyapatite on the MTA surface and provides a biological seal

7. Biocompatibility MTA is a biocompatible material with good sealing ability Generate little or no inflammatory response in periarticular tissue Encourage the formation of fibrous connective tissue Formation of cementum covering the entire root end Ca & p are the main ionspresent in thismaterial which are thecomponents of dental tissue

8. Sealing ability Moistened cotton pellet should be placed in contact with MTA before placement of the permanent restoration

9. 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.

10. 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

11. BIODENTINE COMPOSITION Powder Packaged in capsule 0.7 g 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

12. CLINICAL APPLICATIONS OF BIODENTINE

13. 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

14. Mechanism of action

15. Mechanism of action

16. 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