EFDA HOTTEL BASES AND LINERS 35 EXAM
QUESTIONS & CORRECT ANSWERS LATEST 2025
What are the 9 reasons to use bases and liners? - ANSWER-1. 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? - ANSWER-1. seal off dentin tubules/ prevent chemical
irritation
2. reduces leakage around restoration
3. Do not offer thermal protection
Cavity varnish - ANSWER-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? - ANSWER-used to protect the pulp from pressures during
condensing
, Types of Reinforcers - ANSWER-any material used in a thick layer between floor of
prep and restorative material.
Insulators - ANSWER-protect pulp from thermal irritation
types of insulators - ANSWER-1.zinc oxide eugenol
2. zinc phosphate cement
3. zinc polyacrylic cements
Zinc oxide eugenol - ANSWER-Temporary cement - sedates the pulp
oil of cloves
base and reinforcer
eugenol interferes with the setting of resins
Zinc phosphate cement - ANSWER-insulator and reinforcer
main ingredient is phosphoric acid
can irritate the pulp from exothermic reaction
can go under amal fillings to reduce gray appearance
mixed on a cool glass slab
Zinc Polyacrylate Cement - ANSWER-weaker than zinc phosphate but not as
irritating
has poor handling qualities
QUESTIONS & CORRECT ANSWERS LATEST 2025
What are the 9 reasons to use bases and liners? - ANSWER-1. 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? - ANSWER-1. seal off dentin tubules/ prevent chemical
irritation
2. reduces leakage around restoration
3. Do not offer thermal protection
Cavity varnish - ANSWER-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? - ANSWER-used to protect the pulp from pressures during
condensing
, Types of Reinforcers - ANSWER-any material used in a thick layer between floor of
prep and restorative material.
Insulators - ANSWER-protect pulp from thermal irritation
types of insulators - ANSWER-1.zinc oxide eugenol
2. zinc phosphate cement
3. zinc polyacrylic cements
Zinc oxide eugenol - ANSWER-Temporary cement - sedates the pulp
oil of cloves
base and reinforcer
eugenol interferes with the setting of resins
Zinc phosphate cement - ANSWER-insulator and reinforcer
main ingredient is phosphoric acid
can irritate the pulp from exothermic reaction
can go under amal fillings to reduce gray appearance
mixed on a cool glass slab
Zinc Polyacrylate Cement - ANSWER-weaker than zinc phosphate but not as
irritating
has poor handling qualities
