Dental Materials F6
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DENTAL MATERIALS F6 GLASS IONOMER CEMENT •
Versatile dental cement
•
Most recent addition
•
Dispensed in POWDER –LIQUID FORM
•
Introduced in the market to preserve sound tooth tissues
•
Mixing time: 45 – 60 seconds
•
Particle size: >20µm
*Silicates are retained in the cavity through mechanical retention by preparing mechanical undercuts CLASSIFICATION OF GIC ACCORDING TO USAGE: •
TYPE I – CEMENTATION
•
TYPE II – RESTORATION
POWDER COMPONENTS: •
SILICA
•
ALUMINA
•
FLUORIDE IONS
•
o
AESTHETIC RESTORATION (TOOTHCOLORED)
o
METAL MODIFIED
TYPE III – LINER/BASE/SEALANT
*TYPE II GIC are only used for CLASS III or CLASS V cavities LIQUID COMPONENTS: SMEAR LAYER •
AQUEOUS SOLUTION OF POLYACRYLIC ACID + CO-POLYMER
•
Mild acid
o
Biocompatible
o
Chelation process
METAL MODIFIED
Chemical bonding
ITACONIC ACID o
For viscosity of fluid
o
Reduce tendency of setting time
o
Improves handling characteristics
o
Prolong mixing time
o
Shorten setting time
•
25% of silver is added to the component
•
Used for core build up
•
Used for posterior restorative material on deciduous teeth o
TARTARIC ACID
USES: •
Made of saliva, food debris or tooth chips
*to remove smear layer, put acid chemical for 5 seconds then spray off with water for 5 seconds before packing the GIC
o
•
•
•
Used on microcavities of permanent teeth
•
Used as liner/base because it is biocompatible due to large molecule size
GIC
RESIN TAGS •
Permanent restorative material
Acid etch the base and the enamel to make their surface porous o
PROPERTIES: •
Anti-cariogenic
•
0.4% solubility (less soluble)
•
Translucent
•
Compressive strength: 22,000 psi
•
Tensile strength: 960 psi with addition of metals
•
Setting time: 4 – 5 minutes
Due to less masticatory load
For better retention
SANDWICH TECHNIQUE •
Base is GIC
GIC USED AS SEALANT •
When explorer can’t pass through pits and fissures
*carious lesions are soft PACKING •
Needs celluloid strip to function as wall
*final polishing is delayed for 1 – 2 days * remove excess or rough surface RESIN MODIFIED GIC •
With resin to give a stronger set
•
Dual cure o
CHEMICAL SETTING
o
Due to GIC
LIGHT CURING
Due to resin component
-Rosette Go 030309
Versatile dental cement
•
Most recent addition
•
Dispensed in POWDER –LIQUID FORM
•
Introduced in the market to preserve sound tooth tissues
•
Mixing time: 45 – 60 seconds
•
Particle size: >20µm
*Silicates are retained in the cavity through mechanical retention by preparing mechanical undercuts CLASSIFICATION OF GIC ACCORDING TO USAGE: •
TYPE I – CEMENTATION
•
TYPE II – RESTORATION
POWDER COMPONENTS: •
SILICA
•
ALUMINA
•
FLUORIDE IONS
•
o
AESTHETIC RESTORATION (TOOTHCOLORED)
o
METAL MODIFIED
TYPE III – LINER/BASE/SEALANT
*TYPE II GIC are only used for CLASS III or CLASS V cavities LIQUID COMPONENTS: SMEAR LAYER •
AQUEOUS SOLUTION OF POLYACRYLIC ACID + CO-POLYMER
•
Mild acid
o
Biocompatible
o
Chelation process
METAL MODIFIED
Chemical bonding
ITACONIC ACID o
For viscosity of fluid
o
Reduce tendency of setting time
o
Improves handling characteristics
o
Prolong mixing time
o
Shorten setting time
•
25% of silver is added to the component
•
Used for core build up
•
Used for posterior restorative material on deciduous teeth o
TARTARIC ACID
USES: •
Made of saliva, food debris or tooth chips
*to remove smear layer, put acid chemical for 5 seconds then spray off with water for 5 seconds before packing the GIC
o
•
•
•
Used on microcavities of permanent teeth
•
Used as liner/base because it is biocompatible due to large molecule size
GIC
RESIN TAGS •
Permanent restorative material
Acid etch the base and the enamel to make their surface porous o
PROPERTIES: •
Anti-cariogenic
•
0.4% solubility (less soluble)
•
Translucent
•
Compressive strength: 22,000 psi
•
Tensile strength: 960 psi with addition of metals
•
Setting time: 4 – 5 minutes
Due to less masticatory load
For better retention
SANDWICH TECHNIQUE •
Base is GIC
GIC USED AS SEALANT •
When explorer can’t pass through pits and fissures
*carious lesions are soft PACKING •
Needs celluloid strip to function as wall
*final polishing is delayed for 1 – 2 days * remove excess or rough surface RESIN MODIFIED GIC •
With resin to give a stronger set
•
Dual cure o
CHEMICAL SETTING
o
Due to GIC
LIGHT CURING
Due to resin component
-Rosette Go 030309
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