DMS

Question 1

what are the differences in composition between decorative and dental ceramic

Answer 1

dec has koalin 50% but den has less that 5%

dec has 15% feldspar but den has 70-80%

dec has 0% glass but den has up to 15%

Question 2

transluceny

Answer 2

allows transmission of light, but not completely transparent

Question 3

opalescence

Answer 3

material appears to change in colour when viewed under different lighting

colour shift, light scattering

Question 4

how can you modify the ceramic surface to make it more retentive prior to using silane?

Answer 4

hydrofluoric acid

Question 5

chemically, how does a silane coupling agent work when bonding composite to ceramic

Answer 5

hydrolysis -> condensation -> polymerisation

dual bonding mechanism

methacrylate group that covalent bonds with resin through free radical polymerisation

alkyoxyl groups bonds with hydroxyl groups on ceramic surface

Question 6

what is the function of silane in a composite restorative material

Answer 6

improves bonding/adhesion

enhances mechanical properties

Question 7

how is porcelain surface prepped in a lab for bonding

Answer 7

etching with hydrofluoric acid

Question 8

what do you use to bond porcelain to composite luting resin

Answer 8

silane coupling agent

Question 9

when would you use a dual-cured material

Answer 9

thick material [procelain etc]
metal restoration

Question 10

why would you still light cure a dual cured material

Answer 10

properties are reduced by 25% if not dual cured

Question 11

types of veneers

Answer 11

porcelain, composite
gold

Question 12

what would you do to a metal in a lab to prepare

Answer 12

sandblast

Question 13

what chemical agent used to bond metal

Answer 13

MDP, 4-META

Question 14

What metal can be used for an acid-etch retained bridge

Answer 14

NiCr, CoCr

Question 15

anatomical landmark for the post dam

Answer 15

vibrating line

Question 16

components of stainless steel and percentage

Answer 16

iron 72%
chromium 18%
nickel 8%
titanium 1.3%
carbon 0.7%

Question 17

describe work hardening

Answer 17

strengthening of metal via plastic deformation

crystal structure dislocation, dislocations interact and create obstructions in crystal lattice, resistance to dislocation formation develops

increased strength and hardness

Question 18

springiness

Answer 18

ability of material to undergo deflections without permanent deformation

Question 19

disadvantages of self cure PMMA

Answer 19

high shrinkage
high thermal release [exothermic]
poor abrasion resistance
residual monomer which may be toxic

poor compressive/tensile

Question 20

MOD Bell Glass Inlay - how to determine impression is usable

Answer 20

no airblows
ensure impression not seperated from impression tray
full cuspal coverage
gingival margin recorded
no tears

Question 21

list 4 faults with impressions

Answer 21

airblows
voids
dragging
tear upon removal
no adhesive applied prior

Question 22

how would you decontaminate an impression

Answer 22

rinse under cold water
place in perform for 10 mins
sodium benzoate
take out, rinse, wrap in gauze, place in bag and send to lab