Lec 4 - Resin Based Composite

Question 1

A compound of two or more distinctly different materials with properties that are superior or intermediate to those of the individual constituents”

Answer 1

composite

Question 2

organic part of enamel

Answer 2

enamelin

Question 3

inorganic part of enamel

Answer 3

hydroxyapatite

Question 4

organic part of dentin

Answer 4

collagen

Question 5

inorganic part of dentin

Answer 5

hydroxyapatite

Question 6

just like teeth, these are a compound of two or more distinctly different materials

Answer 6

resin composite

Question 7

two advantages of resin composite

Answer 7

esthetics, fracture resistance, wear resistance, command set, low thermal conductivity, radiopacity

Question 8

two disadvantages of resin composite

Answer 8

lengthy placement, polymerization shrinkage, technique sensitivity, water sorption

Question 9

four components of resin composites with first two being most important

Answer 9

polymer matrix, fillers, coupling agent, initiators

Question 10

inorganic fillers

Answer 10

quartz, glass

Question 11

these are added to matrix to improve physical properties

Answer 11

filler particles

Question 12

inorganic fillers make up this much of the volume of composite

Answer 12

30-70

Question 13

inorganic fillers make up this much of the weight of composite

Answer 13

50-85

Question 14

these coat filler particles promoting adhesion to the matrix and prevents water penetration and wear

Answer 14

coupling agent

Question 15

coupling agent that is used in composites to make it strong

Answer 15

silane

Question 16

this activates polymerization reaction

Answer 16

initiator

Question 17

wavelength of light to polymerize composite

Answer 17

460-480 nm blue

Question 18

volumetric shrinkage of composite

Answer 18

up to 7%

Question 19

3 types of handling characteristics of composite

Answer 19

conventional, packable, flowable

Question 20

largest resin composite

Answer 20

macrofill

Question 21

smallest resin composite classification

Answer 21

nanofill

Question 22

microfill advantages

Answer 22

excellent polish, used for highly esthetic areas

Question 23

microfill disadvantages

Answer 23

low strength, water absorption

Question 24

best composite to get best properties of traditional and microfill composites but just to a lesser degree

Answer 24

hybrid

Question 25

these were developed to combine polishing properties of microfilled composite and the strength of hybrids

Answer 25

micro-hybrid composite (nano filled)

Question 26

resins with high viscosity that can be placed in bulk

Answer 26

packable resins

Question 27

packable resins are harder to blank

Answer 27

polish

Question 28

resins with low viscosity due to lower filler volume but less resistant to wear but more elastic

Answer 28

flowable composites