removable pros

Question 1

Which of the following materials is most suitable for modifying a stock tray for a primary impression?

a. green stick
b. pink stick
c. silicone putty
d. ribbon wax

Answer 1

c - silicone putty

Question 2

What can be defined as the resistance to vertical movement of a denture away from the underlying mucosa

a. stability
b. retention
c. support
d. rigidity

Answer 2

B - retention

Question 3

According to Cawood and Howell’s descriptive classification, a class IV ridge is:

a. negative
b. atrophic
c. recent extraction
d. knife-edged

Answer 3

D - knife edged

Question 4

Provil putty is a type of what:

a. polysulphide
b. condensation cured-silicone
c. polyether
d. addition cured silicone

Answer 4

D - addition cured silicone

Question 5

Which of the following can be defined as:
the difference between the resting face height and the occlusal vertical dimension?

a. interproximal space
b. vertical overlap
c. stability
d. freeway space

Answer 5

D - freeway space

Question 6

Which impression material has a double decomposition reaction involving calcium sulphate and is popular because it is cheap and can be used in a stock tray?

a. condensation cured silicone
b. polyether
c. polysulphide
d. zinc oxide eugenol impression paste
e. irreversible hydrocolloid (alginate)

Answer 6

E - irreversible hydrocolloid

Question 7

Which impression material is available in sheet or disc form and is softened in a water bath set to 55-60º to be used in stock trays for edentulous ridges?

a. irreversible hydrocolloid (alginate)
b. reversible hydrocolloid (agar)
c. zinc oxide eugenol impression paste
d. impression compound
e. silicone putty

Answer 7

D - impression compound

Question 8

Overjet is defined as:

a. a horizontal measure
b. a vertical measure

Answer 8

A - horizontal measure b

Question 9

How many times greater does ridge resorption occur in the mandible compared to the maxilla?

Answer 9

4 x

Question 10

Define retention -

Answer 10

Resistance to displacive forces directed away from the tissues.

Question 11

Define support -

Answer 11

resistance to forces directed towards the hard / soft tissues.

Question 12

Define reciprocation -

Answer 12

the compensating element to counteract horizontal force from active clasps.

Question 13

Define bracing -

Answer 13

resistance to horizontal forces when fully seated.

Question 14

Define what a connector is -

Answer 14

links all the components of the denture together in a place that won’t damage the soft tissues.

Question 15

Define indirect retention -

Answer 15

resistance to displacive forces along the retentive axis.

Question 16

Define syneresis -

Answer 16

evaporation from the colloid compound, causing the alginate to shrink due to loss of water.

(prevented by wrapping the imp in damp gauze)

Question 17

Define inbibition -

Answer 17

when a hydrocolloid compound absorbs too much water, leading to swelling.

(happens when imp is stored for too long in moist environment)

Question 18

Define vibrating line -

Answer 18

The junction between the hard and soft palate.

Question 19

What is the purpose of having tissue stops on special trays?

Answer 19

Ensures uniform thickness of impression material - can’t press the tray any further.

Question 20

What should be written in the lab prescription when requesting an upper special tray for alginate?

Answer 20

please cast impressions in dental stone and construct:

upper special tray for alginate (2-3mm spacing) with tissue stops and stepped handle.

Question 21

What should be written in the lab prescription when requesting a lower special tray for PVS?

Answer 21

please cast impressions in dental stone and construct:

lower special tray for PVS (1.5-2mm spacing) with tissue stops, sub-handle and finger rests (x2 in the premolar region).

Question 22

What is the recommended spacing for alginate?

Answer 22

2-3mm

Question 23

What is the recommended spacing for PVS?

Answer 23

1.5-2mm