Lec 6 Liners and Bases Flashcards
Material applied to the inside of the floor/wall of a cavity, for protection of the pulp.
Liner
Used beneath permanent restorations to enhance recovery of injured pulp or to protect it from thermal shock, galvanic shock, mechanical trauma, microleakage, and toxic substances in some restorations.
Base
A material usually placed in thin layers (~0.5mm) on exposed dentine or pulp within a cavity preparation.
Dental liners
Purpose of ________:
* Formation of secondary dentine
* Pulpal medication
* Thermal protection
* Barrier to chemical irritants (which might be diffusing out of the restoration or oral fluids > That may penetrate leaky tooth restoration)
liners
3 materials used as liners?
1) Calcium hydroxide
2) Glass ionomer
3) Zinc oxide eugenol (ZOE)
A material applied in thicker layers within the cavity preparation.
Dental base
Purpose of ______:
* Provides thermal protection for the pulp
* Mechanical support for the overlying restoration (by distributing stress evenly across the underlying dentinal surface)
* Provides resistance during amalgam condensation (in areas where dentine over the pulp is thin)
* Blocks out undercuts.
bases
5 materials used for bases?
1) Glass ionomer
2) Zinc polycarboxylate
3) Zinc phosphate
4) Zinc oxide eugenol
5) Flowable resin
A strong alkali with a slightly bitter alkaline taste, produced by the reaction of calcium oxide with water.
Calcium hydroxide
Used to place the cement (calcium hydroxide) on the prepared tooth.
Ball tip end applicator
3 uses of calcium hydroxide?
- Liner
- Root canal sealer
- Pulp-capping agent
Uses of _________?:
* Liner
* Root canal sealer
* Pulp-capping agent
Calcium hydroxide
3 dispensing forms of calcium hydroxide?
- Single paste form
- Powder form
- Two paste form
- Light cured, stronger than 2 pastes form
- Setting time is controllable.
Single paste form
Mix with distilled water to form a paste mixture.
Powder form
- Mix it like ZOE.
- Suspended in a chloroform solution of a resinous material and they have a common solvent, the aqueous methyl cellulose, a volatile substance.
- Has a very short setting time less than 30 seconds; dries up fast.
Two paste form
- Has antimicrobial property.
- Has a basic pH (11), acting as an irritant, leading to formation of reparative dentin.
Calcium hydroxide
A powder-liquid product where the powder is a silicate glass that contains calcium, aluminum, and fluoride.
Glass-ionomer cement (GIC)
The liquid in GIC?
polyacrylic acid
2 dispensing forms of GIC?
Powder
Liquid
Anticariogenic and makes cement translucent.
Fluoro - Aluminosilicate Glass
Are adhesive tooth colored anticariogenic restorative materials.
Glass-ionomer cement (GIC)
— Has an ability to bond to tooth structure.
— Causes reduction in recurrent caries due to the release of fluoride.
— Reduction in the problems associated with microleakage. This has been attributed to its antimicrobial properties.
Glass-ionomer cement (GIC)
These materials should not be used as direct pulp-capping agents, since they will cause a persistent inflammatory pulpal response.
Glass-ionomer cement (GIC)
