PROS EXAM

Question 1

Describe kennedy class I

Answer 1

bilateral free end saddle

Question 2

describe kennedy class II

Answer 2

unilateral free end saddle

Question 3

describe kennedy class III

Answer 3

unilateral bounded saddle not crossing midline

Question 4

describe kennedy class IV

Answer 4

bounded saddle crossing the midline

Question 5

what must be present with a retentive clasp?

Answer 5

a reciprocal component i.e., chrome plate or clasp

Question 6

what should a clasp be when seated?

Answer 6

passive

Question 7

what are the dimensions required for a mid palatal bar?

Answer 7

bar width between 7 and 12mm

Question 8

where can gingivally approaching clasps be placed on the tooth?

Answer 8

middle, mesial or distal

Question 9

what are the different types of gingivally approaching clasps?

Answer 9

roach T/T clasp
I bar clasp

Question 10

what materials can make clasps?

Answer 10

COCR
SS
GOLD

Question 11

what design of clasp puts less stress on the tooth?

Answer 11

I bar

Question 12

what design of clasps require an occlusal rest?

Answer 12

ring clasp
occlusally approaching circumferential clasp
three arm clasp

all made from COCR

Question 13

why is a dental bar more hygienic?

Answer 13

frees up the gingival margins and lingual mucosa

Question 14

what is a requirement for a dental bar?

Answer 14

no anterior spacing

Question 15

what are the measurements for dental bars?

Answer 15

crown height of 9mm
bar width 5mm
2mm clearance from gingival margin
2mm clearance from incisal tip of tooth

Question 16

what are the measurements for a lingual bar?

Answer 16

7mm from sulcus depth to gingival margin
3.5mm bar
3.5mm clearance from gingival margin

Question 17

when may you want to use a lingual bar?

Answer 17

spaced anteriors
covers less gingival margins that a cocr plate

Question 18

what can be added to a lingual bar for indirect retention?C

Answer 18

Cummer arms - resists posterior uplift

Question 19

what is the role of an undercut gauge?

Answer 19

determines the amount of undercut an occlusally approaching clasp can engage

Question 20

what undercut can cocr clasps engage?

Answer 20

0.25mm

Question 21

what undercut can ss clasps engage?

Answer 21

0.5mm

Question 22

what undercuts can gold clasps engage?

Answer 22

0.75mm

Question 23

what are the properties of the clasp materials?

Answer 23

cocr - brittle
ss - more flex
gold - most flex

Question 24

what are the 2 components of an occlusally approaching clasp?

Answer 24

flexible tip - below survey line
bracing - above survey line

Question 25

what are the 3 types of articulators?

Answer 25

plane line average value semi adjustable with face bow

Question 26

what is an average value articulator?

Answer 26

condyle angle set to an average 25-35 degrees table set to an angle of 10 degrees

Question 27

what is a facebow used for?

Answer 27

records relationship between maxilla and TMJ

Question 28

what are the advantages of injection moulding over dough packing?

Answer 28

no flash - minimises open bite no trial pack less handling of material less pressure when injecting material

Question 29

what are the disadvantages of injection moulding over dough packing?

Answer 29

no need to add sprue extra training expensive technique sensitive difficult to deflask

Question 30

what is flash?

Answer 30

the excess that comes out the side of the flask when dough packing

Question 31

what does the thickness of flash result in?

Answer 31

thickness of denture

Question 32

what do you do after injection moulding/ dough packing?

Answer 32

process grind polish

Question 33

what may be seen with dough packing when denture is placed back on articulator?

Answer 33

pin wont touch table

Question 34

what must a dough packed denture need done to it when fitting?

Answer 34

occlusal adjustment

Question 35

what is contraction porosity caused by?

Answer 35

lack of pressure on acrylic resin - not enough resin to fill mould or failure to apply enough pressure when clamping flasks

Question 36

what does contraction porosity look like?

Answer 36

small holes right through the denture

Question 37

what is gaseous porosity caused by?

Answer 37

wrong curing cycle - too rapid heating when processing denture

Question 38

where would you find gaseous porosity?

Answer 38

in the thickest part of the denture

Question 39

what can happen if the alginate impression if left in the sterilising solution for too long?

Answer 39

imbibition

Question 40

what can happen to the alginate impression if it is not kept in a sealed bag with wet napkins?

Answer 40

synerisis

Question 41

what are the anatomical features of the upper denture bearing area?

Answer 41

labial sulcus buccal sulcus labial frenum incisive papilla palatine rugae palatine raphe buccal frenum tuberosity hamular notch vibrating line palatine foveae

Question 42

what anatomical features are found in the lower denture bearing area?

Answer 42

labial sulcus labial frenum lingual frenum buccal frenum buccal sulcus lingual sulcus buccal shelf retromolar pad

Question 43

list the anatomy of the skull and surrounding muscles

Answer 43

medial pterygoid buccinator condyle orbicularis oris mental nerve nasalis coronoid process masseter temporalis zygomaticus major

Question 44

what is the fox's guide plane used for?

Answer 44

determining a level occlusal plane

Question 45

what is the willis bite gauge used for?

Answer 45

recording the occlusal vertical dimension

Question 46

when may you decide to use flat cusped teeth?

Answer 46

when bite is not reproducible

Question 47

what may a molloplast soft lining do to a denture?

Answer 47

weakens as there is less acrylic

Question 48

what can you add to a denture with a molloplast soft lining to strengthen it?

Answer 48

wire strengtheners

Question 49

what are the indications for rebasing a denture?

Answer 49

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

Question 50

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

Answer 50

remove undercuts

Question 51

what technique is used to take a wash impression?

Answer 51

closed bite technique

Question 52

why do you use the closed bite technique for wash impressions?

Answer 52

avoids occlusal errors such as open bite and reduced thickness of material

Question 53

what is the term used to describe the change in length of a specimen when testing dental materials?

Answer 53

elongate a specimen

Question 54

what is the term that describes the hardness of a material?

Answer 54

force applied to a mid beam to fracture it