Prosthodontics

Question 1

give another name for master impressions

Answer 1

secondary
definitive

Question 2

regarding physical retention of dentures, what are two important denture design factors

Answer 2

border seal
occlusal stability

Question 3

list two anatomical features that are useful in determining the position of posterior border of complete upper denture

Answer 3

vibrating line
hamular notch

Question 4

3 anatomical features that should be recorded in master impression of edentulous mandibular arch

Answer 4

retromolar pad
buccal shelf
residual alveolar ridge

Question 5

two impression materials to record master impressions

Answer 5

alginate
silicone

Question 6

regarding complete upper denture, what factors can affect the physical retention of the denture

Answer 6

border seal
muscle encroachment
over/under extension
occlusal stability

Question 7

custom tray 3mm spaced
what impression material would be used and why

Answer 7

alginate
mucostatic - accurate record without displacement
thicker

Question 8

why would you not use silicone for a 3mm spaced tray

Answer 8

or ZOE

it is mucocompressive
likely to to tear, not effective for undercuts

use for close fitting trays, replica dentures, wash impressions

Question 9

areas of support on mandibular arch

Answer 9

buccal shelf
residual alveolar ridge

Question 10

what muscle lies adjacent to the buccal shelf and residual alveolar ridge

Answer 10

mylohyoid muscle

Question 11

what part of the mandible might interfere with maxillary impression within tuberosity regions during lateral excursion while taking a functional impression

Answer 11

coronoid process

Question 12

which structures provide support for the mandible and maxilla

Answer 12

mandible;
buccal shelf, residual alveolar ridge

maxilla;
posterior palate, rugae, tuberosity

Question 13

what is retention

Answer 13

resistance to displacement of the denture base away from the ridge, resists forces of gravity, adhesiveness of foods and forces with opening mouth

Question 14

what is stability

Answer 14

quality of denture to be firm, steady and constant in position when forces are applied to it [especially resistance against horizontal or rotary movements]

Question 15

impression material used in primary impression stage

give 2 advantages

Answer 15

alginate;
- ease of use
- cheap

impression compound;
- mucocompressive, displaces tissues so more accurate
- cheap, re-usuable

silicone
- low permanent deformation

Question 16

what is meant by watt and macgregors biometric guides

Answer 16

placement of denture teeth in pre-extraction position

Question 17

when applying watt biometric guide, what anatomical feature is used as fixed point of reference

Answer 17

remnant of lingual gingival margin

Question 18

what is the maximum data set that should be recorded onto the lip block

Answer 18

lip line
incisal line
midline
buccal corridor
occlusal plane
canine line

Question 19

what are the complete denture clinical stages

Answer 19

1. primary impressions
2. master impressions
3. jaw registration
4. tooth trial / try in
5. delivery
6. review