PROS EXAM Flashcards

(54 cards)

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?

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
what are the 3 types of articulators?
plane line average value semi adjustable with face bow
26
what is an average value articulator?
condyle angle set to an average 25-35 degrees table set to an angle of 10 degrees
27
what is a facebow used for?
records relationship between maxilla and TMJ
28
what are the advantages of injection moulding over dough packing?
no flash - minimises open bite no trial pack less handling of material less pressure when injecting material
29
what are the disadvantages of injection moulding over dough packing?
no need to add sprue extra training expensive technique sensitive difficult to deflask
30
what is flash?
the excess that comes out the side of the flask when dough packing
31
what does the thickness of flash result in?
thickness of denture
32
what do you do after injection moulding/ dough packing?
process grind polish
33
what may be seen with dough packing when denture is placed back on articulator?
pin wont touch table
34
what must a dough packed denture need done to it when fitting?
occlusal adjustment
35
what is contraction porosity caused by?
lack of pressure on acrylic resin - not enough resin to fill mould or failure to apply enough pressure when clamping flasks
36
what does contraction porosity look like?
small holes right through the denture
37
what is gaseous porosity caused by?
wrong curing cycle - too rapid heating when processing denture
38
where would you find gaseous porosity?
in the thickest part of the denture
39
what can happen if the alginate impression if left in the sterilising solution for too long?
imbibition
40
what can happen to the alginate impression if it is not kept in a sealed bag with wet napkins?
synerisis
41
what are the anatomical features of the upper denture bearing area?
labial sulcus buccal sulcus labial frenum incisive papilla palatine rugae palatine raphe buccal frenum tuberosity hamular notch vibrating line palatine foveae
42
what anatomical features are found in the lower denture bearing area?
labial sulcus labial frenum lingual frenum buccal frenum buccal sulcus lingual sulcus buccal shelf retromolar pad
43
list the anatomy of the skull and surrounding muscles
medial pterygoid buccinator condyle orbicularis oris mental nerve nasalis coronoid process masseter temporalis zygomaticus major
44
what is the fox's guide plane used for?
determining a level occlusal plane
45
what is the willis bite gauge used for?
recording the occlusal vertical dimension
46
when may you decide to use flat cusped teeth?
when bite is not reproducible
47
what may a molloplast soft lining do to a denture?
weakens as there is less acrylic
48
what can you add to a denture with a molloplast soft lining to strengthen it?
wire strengtheners
49
what are the indications for rebasing a denture?
loose fitting denture teeth are not worn and are in good condition
50
what must be done to a denture before taking the wash impression?
remove undercuts
51
what technique is used to take a wash impression?
closed bite technique
52
why do you use the closed bite technique for wash impressions?
avoids occlusal errors such as open bite and reduced thickness of material
53
what is the term used to describe the change in length of a specimen when testing dental materials?
elongate a specimen
54
what is the term that describes the hardness of a material?
force applied to a mid beam to fracture it