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

19
Q

CoCr minimum clasp length

20
Q

CoCr undercut depth

21
Q

stainless steel undercut depth

22
Q

gold undercut depth

23
Q

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

24
Q

what teeth are best for providing support

A

canines and molars

25
how long a saddle can teeth support before it becomes partially mucosa borne
healthy teeth can carry 1.5 similar teeth | so bounded saddle could be 3 teeth wide and still be fully tooth borne
26
what is the primary objective of surveying
to find a suitable path of insertion
27
what is a dental surveyor
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
common path of displacement
90 degrees to the occlusal plane - horizontal
29
why do we alter the path of insertion
to eliminate spaces which in turn provides better aesthetics and better retention
30
what does the chiselled edge of the graphite marker allow for
allows it to go interproximal
31
what must be done with undercuts when creating a rpd
they must be either used or blocked out