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BDS2B OSCE > RPD design and surveying > Flashcards

RPD design and surveying Flashcards

1
Q

Kennedy Class I

A

bilateral free end saddle

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2
Q

Kennedy Class II

A

unilateral free end saddle

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3
Q

Kennedy Class III

A

bounded saddle (that does not cross the midline)

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4
Q

Kennedy Class IV

A

bounded saddle that crosses midline

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5
Q

Craddock Class 1

A

tooth borne

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6
Q

Craddock Class 2

A

mucosa borne

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7
Q

Craddock Class 3

A

tooth AND mucosa borne

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8
Q

support

A

resistance to occlusally directed load

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9
Q

retention

A

resistance to vertical displacement

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10
Q

benefits of occlusal rests

A
  • prevent movement of RPD towards mucosa
  • distribute occlusal load
  • prevent over eruption of unopposed teeth
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11
Q

why is the default position for free end saddle rests the opposite side of the tooth

A

to reduce axial torque on the abutment

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12
Q

indirect retention

A

resistance to rotational displacement

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13
Q

reciprocation

A

prevents clasp arm moving clasp tooth

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14
Q

bracing

A

resistance to lateral movement

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15
Q

where should plates be in relation to gingival margins

A

either completely away or completely covering

those that end at gingival margins known as ‘ gum strippers’

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16
Q

RPI

A 
stress relieving clasp system 
common in mandibular arch 
R - mesial rest 
P - proximal plate 
I - I bar clasp
17
Q

what is the purpose of the guide plate on an RPI

A

ensures forces directed down vertical plane

18
Q

how much sulcus height is needed for gingivally approaching clasp s

A

7mm

19
Q

CoCr minimum clasp length

A

15mm

20
Q

CoCr undercut depth

A

0.25mm

21
Q

stainless steel undercut depth

A

0.75mm

22
Q

gold undercut depth

A

0.5mm

23
Q

how much clearance is needed between gingival margins and floor of mouth to place a lingual bar

A

8mm

24
Q

what teeth are best for providing support

A

canines and molars

25
Q

how long a saddle can teeth support before it becomes partially mucosa borne

A

healthy teeth can carry 1.5 similar teeth

so bounded saddle could be 3 teeth wide and still be fully tooth borne

26
Q

what is the primary objective of surveying

A

to find a suitable path of insertion

27
Q

what is a dental surveyor

A

a paralleling instrument used to identify and mark the maximum contours of tooth hard and soft tissues in order to fabricate a removable denture

28
Q

common path of displacement

A

90 degrees to the occlusal plane - horizontal

29
Q

why do we alter the path of insertion

A

to eliminate spaces which in turn provides better aesthetics and better retention

30
Q

what does the chiselled edge of the graphite marker allow for

A

allows it to go interproximal

31
Q

what must be done with undercuts when creating a rpd

A

they must be either used or blocked out

BDS2B OSCE (14 decks)

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