Glass Polyalkenoates

Question 1

what are polycarboxyltae cements

Answer 1

ZnO

polycarboxylic acid

Question 2

what are the properties of set cement of polycarboxyltae

Answer 2

adhesive to tooth
poor appearance
high solubility
poor mech props

Question 3

what si the better polycarboxylate cement

Answer 3

ion leachable glass

polycarboxylic acid

Question 4

what are the properties of the better polycarbox cements

Answer 4

adhesive
better appear
better mech props
les solu

Question 5

what is glass polyalkenoate supplied as

Answer 5

powder and liquid
powder and water
encapsulated

Question 6

what is the powder and liquid method

Answer 6

powder - Na aluminosilicate glass + CaF

liquid - ap sol of acrylic and copolymer + tartaric acid

Question 7

what does tartaric acid do

Answer 7

control setting characteristics

Question 8

what is the setting reaction of glass polyA’s

Answer 8

acid base reaction
siliceous hydrogel and water
unreacted cores

Question 9

what site powder and water method

Answer 9

powder - Na aluminosilicate glass + CaF

vacuum dried polyacid

Question 10

what si the porosity like with viscous and fluid cements

Answer 10

viscous - low porosity

fluid - mixed by hand less porous if mech mix more porous coz likelihood to froth

Question 11

putting in fridge initiate

Answer 11

acid crystallisation

Question 12

what does bonding to the tooth substance involve

Answer 12

calcium ions

collagen - hydrogen bonding and metallic ion bridging

Question 13

bonding to the tooth may be boosted by

Answer 13

tooth cleanser

• citric acid
• polyacrylic acid

Question 14

what does citric acid do

Answer 14

removes smear laye

Question 15

what does polyacrylic acid do

Answer 15

increases bond strength

Question 16

what are the overall properties of glass polyalkenoates

Answer 16

thermal diffusely close to dentine 
exothermic
fluoride release
aciderosion 
no radiopacity 
good appearance

Question 17

what is a cermet

Answer 17

Ag pelletised mixture of glass and metal particles

Question 18

what are the qualities of cermet

Answer 18

radiopaque 
poor appear
some F release
increased compressive strength
increased fatigue

Question 19

what are some resin modified glass ionomer cements (RMGIC)

Answer 19

modified composite
giomers
RMGIC

Question 20

what is modified composite

Answer 20

filler replaced with aluminosilicate glass inc F release

Question 21

how is mod comp cured

Answer 21

light curing free radical poly

no acid base until late reaction

Question 22

what is a giomer

Answer 22

same as mod comp but aluminosilicate glass pre reacted with polyacid = glass polyalkenate complex

Question 23

what are the two recatioms assc with giomr

Answer 23

surface reaction - better physical props

full rectaion - al particle

Question 24

what is the P:L assc with RMGIC

Answer 24

power - ion leachable glass

liquid - methacrylate resin, polyacid, HEMA, water

Question 25

on mixing RMGIC what happens

Answer 25

acid base starts

light activated sets off resin poly

Question 26

presence of resin in RMGIC means

Answer 26

no need for varnish

Question 27

RMGIC setting conformational change

Answer 27

shrinkage

expand in water

Question 28

RMGIC adhesive andrlease fluoride?

Answer 28

yes adhesive

yes release fluoride varies for materials