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BDS2 CDS RPD > design principles > Flashcards

design principles Flashcards

1
Q

what are the alternative treatments to rpds?

A 
none
fixed prosthesis
-conventional
-renin-bonded
implants
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2
Q

what are the 7 aspects of design?

A 
saddles
support
retention
indirect retention
bracing/reciprocation
connectors
review & simplify
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3
Q

which kennedy classification should you opt for if unsure?

A

the lowest

modifications if more saddles

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4
Q

what is kennedy class 1?

A

bilateral free end saddle

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5
Q

what is kennedy class 2?

A

unilateral free end saddle

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6
Q

what is kennedy class 3?

A

bounded saddle

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7
Q

what is kennedy class 4?

A

anterior bounded saddle crossing midline

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8
Q

what is a modification?

A

extra bounded saddle

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9
Q

what is support?

A

the resistance of the denture to occlusally directed load

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10
Q

why is tooth borne preffered?

A

best support, most stable, teeth don’t move as much, mucosa has elasticity, so denture will bounce

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11
Q

what is retention?

A

resistance of the denture to vertical displacement (lifting away from the tissues)

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12
Q

what are the methods of retention?

A 
clasps
soft tissue undercuts
adhesion (maxillary plates)
friction
path of insertion
precision attachments/implants
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13
Q

what is indirect retention?

A

resistance to rotational displacement

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14
Q

what is reciprocation?

A

prevents a clasp arm moving the clasped tooth

-arm on opposing side

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15
Q

what is a major connector?

A

connects all the components

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16
Q

what is a minor connector?

A

connects rests, clasps, and bracing arms

17
Q

what are the connector options?

A

bar
horseshoe
plate PMMA/CoCr

18
Q

what are the 2 types of bar?

A

mid palatal strap, thin, broad, doesn’t interfere with tongue
ring - stays away from ginigival margins of non-abutment teeth
easy to clean
thin, broader rings better tolerated

19
Q

describe a horseshoe design

A

anterior and lateral saddles, keep palate clear, well accepted

20
Q

what can plates be made of?

A

acrylic - cheaper, thicker

cobalt chrome - heavier, less elastic

21
Q

what factors decide the craddock class?

A 
periodontal condition of abutments
size and position of saddle/abutments
condition of supporting mucosa
occlusion/chewing ability
aesthetics
22
Q

why is a rest seat place on each crown?

A

more confortable

23
Q

what way can clasps increase retention?

A

support on all sides of bounded saddles

24
Q

where on the tooth should rests be placed?

A

in the direction of the replaced tooth

25
Q

how are rests described?

A

position on tooth eg mesial

26
Q

what tooth is ideal for indirect retention and why?

A

canine- due to large root can withstand pressure

-can utilise cingulum

BDS2 CDS RPD (14 decks)

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