pros

Question 1

what type of special tray is used for ZnOE major imp

Answer 1

close-fitting 0.6mm spacer

Question 2

when might you use alginate or silicone for complete major imps

Answer 2

if extensive undercuts are present - request spaced tray

Question 3

how short of sulcus should special tray finish

Answer 3

2mm

Question 4

advantages of using permanent acrylic base for reg

Answer 4

check for comfort + retention early
optimise accuracy of jaw relations

disadvantage - risk permanent base deforming in second cure

Question 5

how should pts occlude when assessing reg for completes

Answer 5

retruded arc of closure - tongue to roof of mouth

Question 6

2 things to check when checking blue mouse reg for c/c

Answer 6

1. check no heal clash

2. check can be relocated

Question 7

articular mounting technique used for c/c

Answer 7

split cast technique

Question 8

3 types of porosity in acrylic

Answer 8

contraction
gaseous
granular

Question 9

what is contraction porosity

Answer 9

insufficient acrylic dough or insufficient pressure during curing
porosity across whole denture base

Question 10

what is gaseous porosity

Answer 10

temperature raised too high - porosity mostly in honest part = lingual flanges

Question 11

what is granular porosity

Answer 11

evaporation of monomer during preparation

blotchy opaque surface

Question 12

3 factors that show occlusion is good c/c

Answer 12

1. occlusal pressure on both sides of mouth the same
2. occlusal contacts indicated by articulating paper on premolar/molar region
3. lateral + protrusive movement possible without cusp interference causing displacement

Question 13

what is a check record

Answer 13

used when a lot of occlusal adjustment needed at finish
wax placed on lower post teeth + adjusted in retruded jaw relation for even contacts
denture placed on articulator + wax used to aid refinement

Question 14

advantage of rebase

Answer 14

doesn’t increase thickness of palate

Question 15

why might denture cause localised pain in lower premolar region

Answer 15

pressure on superficial mental nerve

Question 16

when are alterations to compete denture made?

Answer 16

at first stage - before impression

Question 17

how would you alter occlusion when making a copy denture

Answer 17

wax wafer used - before impression

Question 18

3 stages of copy denture

Answer 18

1. alterations + alginate impression
2. try-in + major imp
3. finish

Question 19

how to take major imp for copy denture

Answer 19

remove undercuts, reduce peripheral border
modify using greenstick
ZnOE
closed mouth technique - even occlusal relationships should be maintained

Question 20

advantages of immediate denture

Answer 20

aesthetics
muscles adapt easier
function maintained 
easier to reg if teeth remaining 
haemorrhage control

Question 21

disadvantages of immediate denture

Answer 21

good cooperation
alveolar bone resorption
increased cost
try-in normally not possible

Question 22

advantages of overdentures

Answer 22

maintenance of bone
proprioceptive feedback
retention
assistance in control of masticatory force
position of mandible during function
reduction of psychological trauma

Question 23

which teeth make the best abutments

Answer 23

canines + molars

Question 24

size of undercut cocr clasp engages

Answer 24

0.25mm

Question 25

what is the neutral zone impression

Answer 25

special functional impression of mandible - pt in function for 10mins

Question 26

how to disinfect impression material

Answer 26

rinse under water

sodium hypochlorite 10000ppm for 5 mins

Question 27

how does palate shape effect retention + stability

Answer 27

flatter palate = better retention but less stability

Question 28

how to avoid gingival stripping with partial dentures

Answer 28

adequate hard tissue support, connectors that do not cover gingival margins, good OH

Question 29

indications for using a spoon denture

Answer 29

small number of anterior teeth missing