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MODULE 6 OSCE > PROS EXAM > Flashcards

PROS EXAM Flashcards

1
Q

Describe kennedy class I

A

bilateral free end saddle

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2
Q

describe kennedy class II

A

unilateral free end saddle

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3
Q

describe kennedy class III

A

unilateral bounded saddle not crossing midline

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4
Q

describe kennedy class IV

A

bounded saddle crossing the midline

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5
Q

what must be present with a retentive clasp?

A

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

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6
Q

what should a clasp be when seated?

A

passive

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7
Q

what are the dimensions required for a mid palatal bar?

A

bar width between 7 and 12mm

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8
Q

where can gingivally approaching clasps be placed on the tooth?

A

middle, mesial or distal

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9
Q

what are the different types of gingivally approaching clasps?

A

roach T/T clasp
I bar clasp

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10
Q

what materials can make clasps?

A

COCR
SS
GOLD

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11
Q

what design of clasp puts less stress on the tooth?

A

I bar

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12
Q

what design of clasps require an occlusal rest?

A

ring clasp
occlusally approaching circumferential clasp
three arm clasp

all made from COCR

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13
Q

why is a dental bar more hygienic?

A

frees up the gingival margins and lingual mucosa

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14
Q

what is a requirement for a dental bar?

A

no anterior spacing

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15
Q

what are the measurements for dental bars?

A

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

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16
Q

what are the measurements for a lingual bar?

A

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

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17
Q

when may you want to use a lingual bar?

A

spaced anteriors
covers less gingival margins that a cocr plate

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18
Q

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

A

Cummer arms - resists posterior uplift

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19
Q

what is the role of an undercut gauge?

A

determines the amount of undercut an occlusally approaching clasp can engage

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20
Q

what undercut can cocr clasps engage?

A

0.25mm

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21
Q

what undercut can ss clasps engage?

A

0.5mm

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22
Q

what undercuts can gold clasps engage?

A

0.75mm

23
Q

what are the properties of the clasp materials?

A

cocr - brittle
ss - more flex
gold - most flex

24
Q

what are the 2 components of an occlusally approaching clasp?

A

flexible tip - below survey line
bracing - above survey line

25
Q

what are the 3 types of articulators?

A

plane line
average value
semi adjustable with face bow

26
Q

what is an average value articulator?

A

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

27
Q

what is a facebow used for?

A

records relationship between maxilla and TMJ

28
Q

what are the advantages of injection moulding over dough packing?

A

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

29
Q

what are the disadvantages of injection moulding over dough packing?

A

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

30
Q

what is flash?

A

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

31
Q

what does the thickness of flash result in?

A

thickness of denture

32
Q

what do you do after injection moulding/ dough packing?

A

process
grind
polish

33
Q

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

A

pin wont touch table

34
Q

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

A

occlusal adjustment

35
Q

what is contraction porosity caused by?

A

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

36
Q

what does contraction porosity look like?

A

small holes right through the denture

37
Q

what is gaseous porosity caused by?

A

wrong curing cycle - too rapid heating when processing denture

38
Q

where would you find gaseous porosity?

A

in the thickest part of the denture

39
Q

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

A

imbibition

40
Q

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

A

synerisis

41
Q

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

A

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

42
Q

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

A

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

43
Q

list the anatomy of the skull and surrounding muscles

A

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

44
Q

what is the fox’s guide plane used for?

A

determining a level occlusal plane

45
Q

what is the willis bite gauge used for?

A

recording the occlusal vertical dimension

46
Q

when may you decide to use flat cusped teeth?

A

when bite is not reproducible

47
Q

what may a molloplast soft lining do to a denture?

A

weakens as there is less acrylic

48
Q

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

A

wire strengtheners

49
Q

what are the indications for rebasing a denture?

A

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

50
Q

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

A

remove undercuts

51
Q

what technique is used to take a wash impression?

A

closed bite technique

52
Q

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

A

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

53
Q

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

A

elongate a specimen

54
Q

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

A

force applied to a mid beam to fracture it

MODULE 6 OSCE (4 decks)

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