Cavity Lining Materials Flashcards
Describe cavity lining materials
Intermediate restorative materials lining the cavity, applied before the placement of the restorative, not temporary but permanent.
What is the purpose of the cavity lining materials
Protection, palliative and therapeutic barrier to stop penetration through the dentinal tubules to protect the pulp.
What are the choices we have for using cavity lining materials before we add the restorative
Nothing
Cavity varnish
Cavity liner
Cavity base
What are some of the cavity lining material groups that we can use
- Varnishes
- Calcium Hydroxide cements
- Zinc oxide based cements
- Glass ionomer cements
- Resin modified glass ionomer cements
- Visible light cured resins
- Calcium silicate based cements
AY BAWS CAN I HABE DE NOTE PLZ
Based on the kind of restorative we use different cavity lining materials to protect the pulp
What kind of pulp protection do cavity varnishes provide
Chemical protection
What kind of pulp protection do cavity liners provide
Pulp medication
Thermal/electrical protection
What kind of pulp protection do cavity bases provide
Thermal/electrical protection
Mechanical protection
What is cavity varnish designed to do
- Seal dentine
- Reduce diffusion through dentin
- Decrease microleakage
- No strengthening
- Does not bond chemically to dentin
Describe the composition of cavity varnish
- Natural resins e.g. copal
- Synthetic resins e.g. polystyrene
- Solvent e.g. alcohol, acetone, ether
- Some calcium hydroxide and/or zinc oxide
What does cavity liner seal and do
Seals exposed dentin
Promotes health of the pulp and adheres to the tooth structure and has antibacterial action
Name some types of cavity liner
Calcium hydroxide
Zinc Oxide eugenol
Zinc oxide non-eugenol
What does cavity base do
Replaces dentin Blocks out undercuts Insulation High strength Minimises bulk of restorative as it is quite thick
What is an undercut
When the cavity goes into the dentin and errr yh the cavity base can fill that
Name some cavity base materials
- Reinforced zinc oxide eugenol
- Visible light cured resins
- Zinc phosphate
- Zinc polycarboxylate
- Glass ionomer
- Resin modified glass ionomer
What are the 2 forms of zinc oxide eugenol cement
Two paste or powder-liquid form
Describe the composition of the powder component of zinc oxide eugenol cement
- Main component (ZnO/MgO)
- Fillers SiO2, Al2O3
- Dicalcium phosphate, mica or rosin - Improves mixing
- Zinc salt 1% accelerates set
Describe the composition of the liquid component of zinc oxide eugenol cement
- Eugenol or oil of cloves
- other oils may also modify viscosity
- Acetic acid 1% - accelerates set
- Water - small amount - essential to set