Surveying and denture design

Question 1

instrument used to analyse tissue undercuts and determine path of insertion

Answer 1

analysing rod

Question 2

instrument used to scribe tooth and tissue undercuts on model

Answer 2

graphite model

Question 3

instrument for measuring desired amount of undercut for clasp material used

Answer 3

undercut gauge

Question 4

instrument used to trim the blocked out undercut areas on model

Answer 4

the chisel

Question 5

what clasp can be used for a diagonal survey line?

Answer 5

occlusally approaching clasp

Question 6

what clasp can be used for a high survey line?

Answer 6

gingivally approaching T bar

Question 7

what clasp can be used for a low survey line?

Answer 7

gingivally approaching I bar

Question 8

what depth of undercut can a CoCr utilise?

Answer 8

0.25mm

Question 9

what depth of undercut can SS utilise?

Answer 9

0.5mm

Question 10

what depth of undercut can gold clasp utilise?

Answer 10

0.75mm

Question 11

what is the most brittle material of clasp?

Answer 11

cocr

Question 12

what are the 3 functions of occlusal rests?

Answer 12

support
direct occlusal loads down long axis of tooth
indirect retention

Question 13

what thickness is required for a PMMA plate?

Answer 13

1.5-2mm

Question 14

what thickness is required for cocr plate?

Answer 14

0.5mm

Question 15

what depth is required from sulcus to gingival margin to prescribe a lingual bar?

Answer 15

7mm

Question 16

what does the 7mm sulcus depth allow for a lingual bar?

Answer 16

3.5mm bar width
3.5mm clearance from gingival margin

Question 17

what can be added to a lingual bar to resist posterior uplift (indirect retention)?

Answer 17

cummer arms

Question 18

what is a requirement for a dental bar?

Answer 18

no spacing between anterior teeth
minimum crown height of 9mm

Question 19

what does 9mm crown height allow with a dental bar?

Answer 19

bar width 5mm
2mm clearance from gingival margin
2mm clearance from incisal tip

Question 20

list types of cocr clasps

Answer 20

ring clasp
occlusally approaching
3 arm

Question 21

what type of clasp can engage deeper undercuts than metal clasps?

Answer 21

dental d acetyl resin clasp

Question 22

variations of gingivally approaching clasps

Answer 22

T
I bar

Question 23

dimension requirements for mid palatal bar, post bar or ant bar?

Answer 23

width between 7-12mm

Question 24

what are undercut areas on the cast filled with?

Answer 24

plaster

Question 25

why are undercut areas on casts filled with plaster?

Answer 25

so PMMA cant enter undercuts