Lecture 6

Question 1

role and fcn of cements

Answer 1

used to bind restoration materials to teeth

Question 2

types of bases for cements

Answer 2

water, oil or resin

Question 3

requirements for cements

Answer 3

low viscosity but good mechanical properties and 25um thickness

Question 4

possible modifications of cement

Answer 4

increase powder:liquid ratio, (powder = filler so viscosity modulus and strength would all increase)

Question 5

types of cements

Answer 5

resin based (composites), glass ionomer, zinc oxide, zinc phosphate, and zinc polyacrylate

Question 6

fcn of bases and liners

Answer 6

protect dentin and seal it to repair it, minimizing sensitivity

Question 7

diff btwn bases and liners

Answer 7

bases provide mechanical and thermal support

Question 8

what material is used for pulp capping?

Answer 8

CaOH2

Question 9

how does CaOH2 work?

Answer 9

undergoes acid base rxn simulating reparative dentin

Question 10

what’s ZOE?

Answer 10

zinc oxide and eugenol - liner that expands when set, has a good seal, minimizes pain

Question 11

disadvantage of ZOE

Answer 11

inhibits polymerization of composites and has bad mech properties

Question 12

requirements for waxes

Answer 12

temporary, melts @ low temp, burns offf, is carvable, and dimensionably stable

Question 13

what does the molecular weight of wax fall between?

Answer 13

polymers and organic solvents (hexane)