part - dental materials

Question 1

what are direct restorative materials

Answer 1

composite
- composed of resin matric, inorganic fillers, coupling agent and pigments
- restorations of class I-V
- closure of diastemas

amalgam
- made of alloy powders and mercury
- small to medium sized cavities in posterior teeth

coupling agents
- an additive that provides chemical bone between two dissimilar materials

Question 2

what are methods of polymerization

Answer 2

auto cure and light cure

Question 3

what is zoe

Answer 3

zinc oxide eugenol
- has a soothing effect on pulp
type I - for temp cements and provisional coverage
type II: permanent cementation
type III: thermal base
type IV: cavity liner

Question 4

what is zinc phosphate

Answer 4

a cement used as a thermal base but must use a cavity liner first due to phosphoric acid

Question 5

what are irreversible hydrocolloids

Answer 5

materials that cannot return to sol state after become a gel
- ex. alginate

Question 6

what is the ratio for dental stone and water

Answer 6

100g powder to 30 ml water

Question 7

what is the ratio for plaster powder to water

Answer 7

100 g powder to 45-50 ml water

Question 8

glass ionomer and its application

Answer 8

• most versatile dental material
• for primary teeth
• final restorations
• sealants
• core amterial buildup
• provisional restorations