Removable pros revision session

Question 1

What is Kennedy class I

Answer 1

bilateral free end saddle

Question 2

What is kennedy class II

Answer 2

unilateral free end saddle

Question 3

what is kennedy class III

Answer 3

single bounded saddle not crossing the midline

Question 4

what is kennedy class IV

Answer 4

single bounded saddle not crossing the midline

Question 5

when inserting a denture into the mouth a force is applied to which tooth?

Answer 5

clasped tooth

Question 6

in order to prevent tooth movement what is required

Answer 6

a reciprocal component

Question 7

what are the dimensions for a mid palatal / posterior / anterior bar?

Answer 7

7-12mm

Question 8

what are the dimension requirements for a lingual bar

Answer 8

minimum of 7mm space from the sulcus depth to the gingival margin

Question 9

what are the advantages of the lingual bar

Answer 9

covers less gingival margins than the cocr plate and may be used when there is spacing between the anterior teeth

Question 10

what do cummer arms provide

Answer 10

indirect retention - resist posterior uplift of the denture

Question 11

what is the minimum total crown height for a dental bar

Answer 11

9mm

Question 12

what are 3 examples of clasps used to retain dentures

Answer 12

ring
occlusally approaching
three arm

Question 13

advantage of D.acetyl resin clasp

Answer 13

very flexible can engage deeper undercuts than metal clasps and is available in a variety of shades

Question 14

Upper major connectors designs

Answer 14

PMMA plate
mid palatal bar
posterior bar
skeletal or ring design
horse shoe design

Question 15

advantages of cocr compared to PMMA

Answer 15

cocr are thinner in section
can free up the gingival margins so are more hygienic and comfortable for the patient

Question 16

what does an undercut gauge determine

Answer 16

the amount of undercut an occlusally approaching clasp can engage depending of the material it is made of

Question 17

what material can utilise an undercut up to 0.25

Answer 17

cocr (brittle material)

Question 18

what material can utilise an undercut up to 0.5mm

Answer 18

stainless steel

Question 19

what material can utilise an undercut up to 0.75mm

Answer 19

gold

Question 20

what are the 3 types of articualtors

Answer 20

plane line
average value
semi adjustable with facebow

Question 21

why is a facebow used

Answer 21

to record the relationship of the maxilla in relation to the TMJ

Question 22

advantages of injection moulding over dough packing

Answer 22

no flash minimising open bite when fitting the dentures
no trial pack
less handling of material
less pressure when injecting material

Question 23

disadvantages of injection moulding over dough packing

Answer 23

need to add sprue
extra training
expense of equipment
difficult to de-flask
technique sensitive

Question 24

what does the piston do

Answer 24

push the resin into the mould

Question 25

what does the red arrow show

Answer 25

the resin exiting the mould indicating the mould is full

Question 26

what is flash

Answer 26

the excess that comes out of the side of the flask

Question 27

what is contraction porosity caused by

Answer 27

lack of pressure on the acrylic resin

Question 28

what is gaseous porosity caused by

Answer 28

wrong curing cycle e.g., too rapidly heating when processing the denture

Question 29

when does imbibition happen

Answer 29

alginate left in sterilising solution for a prolonged period of time

Question 30

what happens if alginate impression is not kept in a sealed bar with wet napkins

Answer 30

synerisis

Question 31

what does the fox’s guide determine

Answer 31

level occlusal plane

Question 32

what does the willis gauge determine

Answer 32

recording the OVD

Question 33

give an indication when flat cusped teeth may be used

Answer 33

when the patients bit is non-reproducible

Question 34

is it better to have a really thick soft lining

Answer 34

no
a thick soft lining may weaken the denture as there is less acrylic

Question 35

indications for rebasing a denture

Answer 35

the denture is loose fitting
the teeth are not worn and are in good condition

Question 36

what must be done to the denture before taking a wash impression

Answer 36

undercuts are removed from the denture

Question 37

why is a closed bite technique used for a wash impresssion

Answer 37

to avoid occlusal errors such as an open bite