Week 1 - intro to composite restorations

Question 1

types of aesthetic restorative material (tooth colored)

Answer 1

ceramic inlays/onlays
silicate cement
acrylic resin
conventional glass ionomers
composite

Question 2

ceramic inlays/onlays

Answer 2

fabricated in lab

can be done chairside with CAD/CAM

Question 3

silicate cement

Answer 3

no longer used

used to use for anterior restorations

Question 4

acrylic resin

Answer 4

use in areas where temperature change, abrasion, and stress are LIMITED because-
low strength, high polymerization shrinkage

Question 5

conventional glass ionomers

Answer 5

release fluoride for anti-cariogenicity
used for root surface caries
DO NOT use in occlusal areas

Question 6

why are CGI bad for use in occlusal areas?

Answer 6

low resistance to wear and low strength

Question 7

two types of glass ionomers

Answer 7

resin-modified

compomer

Question 8

resin modified GI

Answer 8

resin added to GI to increase physical properties
can be light cured
acid-base setting rxn

Question 9

compomer GI

Answer 9

polyacid modified composite

composite with some GI components

Question 10

Composite components

Answer 10

resin + inorganic filler for increased physical properties

Question 11

what kind of bonding agent used for composites?

Answer 11

silane bonding agent

Question 12

types of composites

Answer 12

macrofill 
microfill
hybrid composites
nanofill composites
packable composites
flowable composite

Question 13

most popular type of composite used today

Answer 13

nanofill composite

Question 14

nanofill composite

Answer 14

small filler particles
highly polishable
packed tight for physical properties

Question 15

packable composites

Answer 15

most viscous
for proximal contact restorations
mimic amalgam

Question 16

flowable composite

Answer 16

low filler content
poor physical properties
class I restorations
bad for high stress areas

Question 17

hybrid composites

Answer 17

high physical properties of macrofill and smoothness of microfill

Question 18

macrofill (conventional)

Answer 18

80% inorganic filler
large particle size
good phys properties but rough texture
not used

Question 19

microfill

Answer 19

35-60% filler
small particles
smooth surface texture, less phys properties

Question 20

important properties of composite

Answer 20

linear coefficient of thermal expansion
water sorption
wear resistance
surface texture
radiopacity
modulus of elasticity
solubility

Question 21

why must composites be radiopaque?

Answer 21

to detect radiolucent recurrent decay

done by adding Ba++ fillers

Question 22

what is wear resistance?

Answer 22

resisting abrasive contact

not as good as amalgam

Question 23

water sorption

Answer 23

amount of water material absorbs over time
absorption decreases phys properties
higher filler = less absorption

Question 24

dimensional change that occurs w/ change in temperature

Answer 24

linear coefficient of thermal expansion

Question 25

modulus of elasticity

Answer 25

stiffness of material

smaller filler = more flexibility

Question 26

solubility

Answer 26

dissolution or loss of material in oral fluid over time

**composites show none

Question 27

controversial issues with composite restorations

Answer 27

liners and bases under composites
retention in class V root surface preps
wear problems
significance in gap formation

Question 28

liners and bases under composite

Answer 28

resin modified GI and flowable for a good seal on root surface areas

traditional liners for pulp protection

Question 29

retention in class V root surface preps

Answer 29

retention grooves

Question 30

gap formation significance

Answer 30

important if restoration extends to root surface