Glass ionomer cement (GIC) and Biodentine

Question 1

What is Glass ionomer cement (GIC)?

Answer 1

-Restorative dental material

-Usually used as a provisional treatment to manage caries

-Composed of powdered glass and aqueous solution of polyacrylic acid.

Question 2

How does GIC bond chemically to the tooth?

Answer 2

GIC forms ionic bonds with calcium ions in the tooth, providing adhesion

Question 3

What does GIC release that aids in the prevention of secondary decay?

Answer 3

Releases fluoride

Question 4

What is GIC commonly used for?

Answer 4

For small fillings

Cementing crowns

Liners

Base for restorations

Question 5

Why can’t GIC be placed near the pulp?

Answer 5

it is acidic

Question 6

What is the adhesion process for GIC?

Answer 6

1. Preparation :
   - Clean + prepare tooth surface by removing decay + debris
   - Use gentle etching to create micro-retentive areas (roughness)
2. Application of GIC:
   - Place mixed GIC on the prepped tooth surface
3. Chemical bonding:
   -Polyacrylic acid in GIC interacts with Ca2+ ions in tooth structure, forming chemical bonds.

Micro mechanical bonding:
- GIC flows into surface irregularities.
-Upon setting, mechanically interlocks with enamel and dentin.

4.Curing/setting:
- Allow GIC to set and cure, establishing a strong bond to the tooth.

Question 6

What are the 2 bonding mechanisms for GIC?

Answer 6

Chemical adhesion

Micromechanical adhesion

Question 7

What are the advantages of GIC?

Answer 7

• Very forgiving of moisture
• Transmits little stress to tooth when setting

-Seals well

-Fluoride release , which prevents secondary decay and support remineralisation.

-Non-irritating of the pulp

Question 8

What is biodentine?

Answer 8

-Bioactive dental material used as a dentin substitute.

• Contains tricalcium silicate powder that is mixed with a liquid containing calcium chloride in an aqueous solution of polycarboxylate.

-Acid component in the liquid but is alkaline when it sets.

-excellent sealing properties

-sets quickly

Question 9

What does biodentine promote?

Answer 9

Dentin regeneration and stimulating the formation of hydroxyapatite.

Question 10

What is the reparative affect of biodentine?

Answer 10

Causes laying down of reparative dentine and bridging off the exposure site.

Question 11

What is the sand which technique?
Involves layering of different

Answer 11

Induction of TGF-B1
materials to achieve specific dental restorations.