EFDA HOTTEL BASES AND LINERS QUESTIONS AND ANSWERS

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EFDA HOTTEL BASES AND LINERS QUESTIONS
AND ANSWERS


Types of Reinforcers
any material used in a thick layer between floor of prep and
restorative material.


What are the 9 reasons to use bases and liners?
caries
2.tramatic occl.
3. effect of cutting bus
4. desiccation
5. condensation pressure
6. chemical irritation
7. temperature changes
8. dimensional changes
9. lack of marginal seal


Basic function of a sealer?
seal off dentin tubules/ prevent chemical irritation
2. reduces leakage around restoration
3. Do not offer thermal protection


Cavity varnish

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a thin layer placed on the floor and walls of the preparation to
seal the tubules and minimize micro-leakage on amalgam fillings.


What is a reinforcer?
used to protect the pulp from pressures during condensing


Insulators
protect pulp from thermal irritation


types of insulators
1.zinc oxide eugenol
2. zinc phosphate cement
3. zinc polyacrylic cements


Zinc oxide eugenol
Temporary cement - sedates the pulp
oil of cloves
base and reinforcer
eugenol interferes with the setting of resins


Zinc phosphate cement
insulator and reinforcer
main ingredient is phosphoric acid