Lec 4 - Resin Based Composite Flashcards Preview

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Flashcards in Lec 4 - Resin Based Composite Deck (28):
1

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

composite

2

organic part of enamel

enamelin

3

inorganic part of enamel

hydroxyapatite

4

organic part of dentin

collagen

5

inorganic part of dentin

hydroxyapatite

6

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

resin composite

7

two advantages of resin composite

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

8

two disadvantages of resin composite

lengthy placement, polymerization shrinkage, technique sensitivity, water sorption

9

four components of resin composites with first two being most important

polymer matrix, fillers, coupling agent, initiators

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inorganic fillers

quartz, glass

11

these are added to matrix to improve physical properties

filler particles

12

inorganic fillers make up this much of the volume of composite

30-70

13

inorganic fillers make up this much of the weight of composite

50-85

14

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

coupling agent

15

coupling agent that is used in composites to make it strong

silane

16

this activates polymerization reaction

initiator

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wavelength of light to polymerize composite

460-480 nm blue

18

volumetric shrinkage of composite

up to 7%

19

3 types of handling characteristics of composite

conventional, packable, flowable

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largest resin composite

macrofill

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smallest resin composite classification

nanofill

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microfill advantages

excellent polish, used for highly esthetic areas

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microfill disadvantages

low strength, water absorption

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

hybrid

25

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

micro-hybrid composite (nano filled)

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resins with high viscosity that can be placed in bulk

packable resins

27

packable resins are harder to blank

polish

28

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

flowable composites