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Removable Prosthedontics > RPD Design I > Flashcards

RPD Design I Flashcards

1
Q

minimal tissue/tooth coverage is achieved via

A

Major connector with open design

avoiding plating teeth

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2
Q

each RPD component must ____

A

have a function

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3
Q

five big general design principles

A
  1. Keep it simple
  2. Maintain symmetry
  3. incorporate essential elements into the design
    (retention guidance support stabilization)
  4. Incorporate essential elements in each direct retainer
  5. Widely distribute design elements around the arch
  6. Avoid placing framework on occlusal contact areas
  7. consider likelihood of tooth loss
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4
Q

Retention elements

A
  1. direct retainer engaging the undercut
  2. friction from guide planes
  3. physical retention form denture base
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5
Q

C+1 rule

A

RPD needs Kennedy Class # + 1 = # of clasps needed

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6
Q

exception to C+1 rule

A
  • Class IVs

- Class II w/out modification= only 2 clasps

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7
Q

Support is from

A
  1. primary rests
  2. auxilary rests (indirect retainers)
  3. denture base (for distal extensions)
  4. RPD components above the survey line
  5. some maxillary major connectors
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8
Q

guidance/stabilization is from

A
  1. including opposing surfaces

2. placed on many teeth

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9
Q

support for aker’s arm is from

A
  1. ⅓ of retentive arm that’s above the survey line
  2. rest
  3. reciprocal arm
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10
Q

for questionable prognosis teeth use mandibular bar or plate?

A

plate- allows for adding teeth

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11
Q

select ___ retainer in anterior abutment of a tooth supported area

A

stress releasing

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12
Q

presence of a fulcrum line determines:

A
  • choice and design of direct retainer (ie. stress releasing_
  • requirement of an indirect retainer
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13
Q

nature of tissue support determines

A
  • type of denture base

- need for future reline

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14
Q

esthetic consideration determines

A

anterior clasp design

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15
Q

steps for RPD design

A
  1. review diagnostic date
  2. survey diagnostic cast
  3. formulate RPD design
  4. draw design on cast (diagnostic then surveyed cast) and lab Rx
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16
Q

review diagnostic data for

A
  • quality of soft tissue support
  • quality of perio support for remaining teeth (C/R ratio)
  • examine mounted diagnostic cast for occlusal scheme, centric contact and inter-occlusal space.
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17
Q

survey diagnostic casts orders

A
  • survey duplicate of diagnostic cast
  • survey duplicate of definitive cast (after fixed prostheses were delivered)
  • survey both teeth and tissue
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18
Q

determining the RPD design sequence

A
  1. select ideal major connector
  2. identify axis of rotation for class 1 and 2
  3. determine teeth for direct retainer
  4. determine teeth for indirect retainer (class 1 and 2)
  5. determine teeth for auxiliary rest
    6 determine specific direct retainer types
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19
Q

determining factors for selecting major connectors

A
  • maxillary arch classification
  • mandibular floor of the mouth depth
  • arch configuration (teeth missing or no)
  • anatomical factors (ie. tori)
  • perio condition of remaining teeth
  • quality of soft tissue
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20
Q

at some point make a flash cards for the summary of major connectors on slides 21 and 22

A

ss

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21
Q

in max arch, the border of major connector should be at least ___ mm form FGM.. otherwise ___

A

in max arch, the border of major connector should be at least 6 mm form FGM.. otherwise plate teeth

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22
Q

in mandibular arch, the border of major connector should be at least ___ mm form FGM.. otherwise ___

A

in mandibular arch, the border of major connector should be at least 3 mm form FGM.. otherwise plate teeth

23
Q

border of the major connector should run ____ to the gingival margins

A

parallel

24
Q

for class 1 put one clasp on each____

A

terminal abutment

25
Q

determining teeth for indirect retainers

A
  • teeth located as far from the fulcrum line as possible
  • indirect retainer should be perpendicular to the fulcrum line
  • usually an auxiliary rest
  • most commonly on canines or first premolars
  • avoid incisors
  • class 1s usually require two indirect retainers
26
Q

teeth for auxiliary rests

A
  • put on abutments next to edentulous areas that don’t have direct retainers
  • put on long segments of major connector that doesn’t have a direct retainer
  • on each end of anterior segment of mandibular lingual plate
27
Q

determination of specific direct retainer types

A
  • location and amount of tooth undercuts
  • presence and location of soft tissue interference when selecting infra-bulge clasps
  • tooth condition (existing restorations)
  • occlusal contact
  • esthetic consideration
28
Q

steps for drawing an RPD design

A
  1. draw all rests (primary, indirect, auxiliary)
  2. draw direct retainer
  3. locate and draw all acrylic resin retention elements
  4. draw major connector outline
  5. draw minor connectors to connect all unattached components
  6. finish drawing major connector
29
Q 
for class III
fulcrum= 
indirect retainer=
use \_\_\_ direct retainers
impression method is \_\_\_
denture base is \_\_\_
A 
fulcrum= nonexistent
indirect retainer=nonexistent 
use simple direct retainers
impression method is less critical
denture base is not critical (short=metal, long=combined)
30
Q

mandibular lingual bar vs. plate

A

bar is best… pts. like it

plate is used more bc there are more indications

31
Q

CC = “”

A

“Aker” “Simple Clasp”

32
Q

primary direct retainers for class III

A

CC or infrabulge

33
Q

class III special situation (undercut location) clasps

A

embrasure clasp
ring clasp
hairpin clasp

34
Q

cast circumfrential clasps disadvantage

A

non stress breaking
poor esthetic
could create occlusal interference
limited adjustability

35
Q

infrabulge clasp indications

A 
esthetic conserns
class II or II survey line, when akers is not indicate
36
Q

invrabulge clasp advantage

A

good esthetics

minimal tooth coverage

37
Q

Infra bulge clasp design

A
  • I bar
  • must keep distal rest and reciprocal arm
  • approach tooth starting 4mm away from FGM
  • cross FGM at 90deg angle
  • reciprocal arm is similar to CC
38
Q

infrabulge contraindications

A
  • inadequate vestibular depth
  • deep soft/hard tissue undercuts
  • high frenum attachment
39
Q

ring clasps indication

A 
medially tipped isolated molars
class II survey line
40
Q

ring clasp disadvantage

A

extensive tooth coverage

41
Q

hairpin clasps indications

A

class II survey line

42
Q

hair pin clasp disadvantage

A

extensive tooth coverage

food trap!!!

43
Q

embrasure clasps indication

A

tooth supported without a mod space

extremely narrow mod space

44
Q

embrasure clasp disadvantages

A

extensive tooth coverage
extensive tooth modification
retainer/rests not widely spread

45
Q

class 1 survey line use:
posterior =
anterior=

A 
class 1 survey line use:
posterior =CC
anterior= I bar
46
Q

class II survey line use:
posterior =
anterior=

A 
class 2 survey line use:
posterior =ring or hairpin
anterior=mod. T or T clasp
47
Q 
class III survey line use:
posterior = tooth modification surveyed crown
anterior= I bar
A 
class III survey line use:
posterior = tooth modification surveyed crown
anterior= I bar
48
Q

palatal strap
design requirement =
indication=
contraindication=

A 
design requirement = at least 1mm thick and 8mm wide
indication=short span class III
contraindication= large tori
49
Q

palatal bar
design requirement =
indication=
contraindication=

A 
design requirement = 2-3mm thick
indication= very short span class III 
contraindication=mesial to 2nd pmolar
50
Q

AP Strap
design requirement =
indication=
contraindication=

A 
design requirement = 
less than 1mm thick
at least 8mm wide
anterior terminate at anterior abutment in rug valley
posterior terminates at vibrating line
indication= 
class 1 with less ideal support
few remaining teeth
inadequate retainer
compromised anterior
51
Q

Palatal strap
design requirement =
indication=
contraindication=

A 
design requirement = 
less than 1mm thick
partial or full coverage
variable anterior termination
posterior terminates at vibrating line
indication=
class 1 with less than ideal support
few remaining teeth
inadequate retainer
compromised anterior
52
Q

U shaped
design requirement =
indication=
contraindication=

A 
design requirement = 
more than 1mm thick
terminate at the junction of vertical ridge and horizontal plate
indication=
inoperable tori
gaging patient

contraindication=
avoid if possible
lacks rigity

53
Q

lingual bar
design requirement =
indication=
contraindication=

A

design requirement =
5mm tall x 2.5 mm thick
half pear shape
at least 3mm from gingival margin

indication=
8mm depth of floor of the mouth
first choice for major connection

contraindication=
lingual plate indication

54
Q

lingual plate
design requirement =
indication=
contraindication=

A 
design requirement = 
covers cingulum up to proximal contact
supported by rest on both sid
lingual plate only distal posterior abutment
indication=
insufficient vest depth
compromised anterior teeth
missing anterior teeth
furure anterior tooth loss
not ideal support
most frequently used 
monor lingual tori

Removable Prosthedontics (1 decks)

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