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PROSTHO II > module 3- FDP > Flashcards

module 3- FDP Flashcards

1
Q

group function

A

multiple contacts on the working side only

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2
Q

mutually protected

A

anterior teeth protect posterior teeth, and vice versa

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3
Q

balanced occlusion

A

in dentures, contact on both sides (to provide stability)

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4
Q

what can limit restorative space

A

over-erupted teeth and tilted teeth

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5
Q

name 3 ideal root configurations for abutment teeth

A
  1. divergent roots
  2. oblong pulp
  3. multiple roots
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6
Q

define ante’s law

A

total periodontal attachment area of abutments should equal to or be greater than that of the teeth being replaced

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7
Q

what is the exception for using a weakened abutment tooth for an FPD

A

if it is opposing a complete denture (due to lower forces)

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8
Q

what 3 things make a good abutment

A
  • good C:R ratio
  • ideal root form
  • good PDL area (Ante’s law)
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9
Q

what is the relationship between deflection and span length

A

deflection = (span length factor)^3

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10
Q

if you go from 1 pontic to 2 pontics, what happens to deflection

A

8x

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11
Q

what tolerates deflection better: metal or ceramics?

A

metal

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12
Q

name 4 “solutions” to counter deflection/long spans

A
  1. grooves (buccal and lingual)
  2. base metal framework
  3. good connector space
  4. double abutments
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13
Q

3 disadvantages of increasing connector space

A
  • poor esthetics
  • poor oral hygiene
  • poor perio health (impinge on gingiva)
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14
Q

what is the relationship between strength and height of connector space

A

strength = (height factor)^3

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15
Q

what is the relationship between strength and width of connector space

A

strength = (width factor)^1

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16
Q

if i increase the height of the connector space by a factor of 2, what happens to the strength?

A

8x

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17
Q

if i increase the width of the connector space by a factor of 2, what happens to the strength?

A

2x

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18
Q

A primary abutment has a C:R of 2:3. Which of the following is a good option for double abutment?

a) tooth with 1:1
b) tooth with 2:3
c) tooth with 2:1
d) tooth with 1:2

A

b) tooth with 2:3

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19
Q

which of the following is the most ideal C:R for an FDP abutment?

a) 1:1
b) 1:2
c) 2:3
d) 2:1

A

c) 2:3

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20
Q

true or false: a double abutment with a retentive retainer can be used to replace an over-tapered retainer for primary abutment

A

false. double abutments should not be used because there is poor retention in the primary abutment

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21
Q

where does the non-rigid connector attach to on the pier abutment

A

on the distal surface

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22
Q

does the pier abutment contain the lock or the key of the non-rigid connector?

A

the lock. the lock goes on the anterior retainer

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23
Q

tooth 33 is a pier abutment. which tooth has the slot?

a) 31
b) 32
c) 33
d) 34

A

c) 33

24
Q

tooth 33 is a pier abutment. which tooth has the key?

a) 31
b) 32
c) 33
d) 34

A

d) 34

25
Q

name 2 design options for tilted abutments and list a disadvantage for both

A
  1. non-rigid connector (adv: can change path of insertion, disad: have to prep more on PM)
  2. leave distal surface unpreped (disad: less rigidity)
26
Q

2 “solutions” to limited restorative space

A
  1. adjust opposing occlusal plane

2. metal FDP

27
Q

which canines make good pontics? maxilla or mandible?

A

mandible (compression forces). Maxilla canine has tension forces that lead to failure

28
Q

list the steps for direct technique interim FDP

A
  • impression
  • prep teeth
  • add material in matrix and set
29
Q

list the steps for indirect technique interim FDP

A
  • prep teeth
  • impression
  • model
  • make temp on model
  • mill restoration
30
Q

list the steps for indirect-direct technique interim FDP

A
  • impression
  • model (can also do a wax-up)
  • do conservative prep on model
  • make PMMA temp
  • prep teeth
  • take hollowed PMMA temp and reline it with integrity
31
Q

name 3 advantages of PMMA

A
  • good polishability
  • repairable
  • durable
32
Q

can you repair bis-acryl?

A

no

33
Q

name an advantage of bis-acryl

A

resistance to abrasion

34
Q

hygienic pontic: location

A

posterior mandible

35
Q

hygienic pontic: pros

A

hygiene

36
Q

hygienic pontic: cons

A

poor esthetics

37
Q

hygienic pontic: contra-indication

A

little VDO, esthetic zone

38
Q

hygienic pontic: material

A

metal

39
Q

modified ridge flap: location

A

anterior teeth, esthetic zone

40
Q

modified ridge flap: advantage

A

esthetic

41
Q

modified ridge flap: material

A

metal-ceramic, ceramic, resin

42
Q

ovate pontic: location

A

esthetic zone, high smile line

43
Q

ovate pontic: advantage

A

superior esthetics, no food entrapment, easy to clean

44
Q

ovate pontic: disadvantage

A

requires surgery, cannot place on ridge defects

45
Q

ovate pontic: material

A

metal-ceramic, ceramic, resin

46
Q

you are making an FPD for the posterior mandible. the patient has poor oral hygiene. what material do you select

a) metal
b) PFM
c) zirconia
d) resin

A

metal. pt has poor oral hygiene so they should have a hygienic pontic. these require metal

47
Q

what material would you use for a long span FDP:

a) layered zirconia
b) monolithic zirconia
c) lithium disilicate
d) PFM

A

d) PFM [(could also use monolithic zirconia if it’s less than 5 unit FPD). don’t use ceramics bc they break due to flexion. layered zirconia is very weak and fractures]

48
Q

why is an inverted smile pattern difficult to treat

A

it can indicate occlusal problems

49
Q

what percent of the population has a complex smile pattern

A

2%

50
Q

E method indicates that the incisal edges are __

A

in the lower third

51
Q

retention for resin-bonded bridges comes from ___

A

resin cement

52
Q

what is the main complication for resin-bonded bridges

A

de-bonding

53
Q

studies show that the best design for resin-bonded bridges is __

A

1 wing designs (cantilever)

54
Q

where does the resistance form come from for resin bonded bridges

A

proximally

55
Q

risk of failure is most common in ___ bridges for resin-bonded bridges

A

mandibular anterior bridges (due to unseating from occlusal forces)

56
Q

what bur do you use to polish metal

A

carbide

57
Q

what bur do you use to polish porcelain

A

diamond

PROSTHO II (3 decks)

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