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Fixed Prosth 3rd year > L4 - FPD's > Flashcards

L4 - FPD's Flashcards

1
Q

retention will be

A

retainer vs pontic

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2
Q

is silver a noble metal?

A

NO

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3
Q

List the nobel metals

A 
1-7 
Au - gold
Pt - platinum
Pd - palladium
Rh - rhodium
Ru - ruthenium
Ir - iridium 
Os - osmium
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4
Q

material with the highest density

A

gold

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5
Q

describe metal-resin

A

metal framewor with resin retention by macro, micro, and chemical

limited esthetic and durability

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6
Q

thermal epansion coefficient - general

A

want these to be equal between materials if using two different ones

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7
Q

example of metal - ceramic

A

the feldspathic porcelain

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8
Q

two failures of porcelain bond in PFM’s

which is more prelevant?

A
  1. cohesive
  2. adhesive

adhesive - have to remake whole thing

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9
Q

tooth abutment considerations with premolars

A

anatomy may be less ideal

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10
Q

more posterior – general consideration

A

shorter teeth and smaller opening

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11
Q

more posterior – general consideration

A

shorter teeth and smaller opening

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12
Q

three things that go into treatment planning considerations

A
  1. resistance form
  2. retention form
  3. ferrule effect
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13
Q

three things that go into treatment planning considerations

A
  1. resistance form
  2. retention form
  3. ferrule effect
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14
Q

definition of ferrule

A

band or ring used to encompass the root or crown of a tooth

any short tube or bushing for maing a tight joing

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15
Q

treatment considerations for connectors

A
  1. require sufficient thickness – height
  2. may require occlusal and gingival metal surface
  3. may require apical repositioning surgery of pontic area
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16
Q

pontic designs

A
  1. ridge lap
  2. modified ridge lap
  3. ovate – hard to do but esthetic
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17
Q

pontic design that is not hygeinc

A

ridge lip – like never use this one

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18
Q

if have an insufficient gingival embrassure – use?

A

all metal - connector

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19
Q

if have an insufficient gingival embrassure – use?

A

all metal - connector

if do not have enough room here then will irritate the tissues in that area

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20
Q

maintenance considerations with FPD’s

A

floss and proximal brushes

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21
Q

maintenance considerations with FPD’s

A

floss and proximal brushes

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22
Q

elements used in all ceramic FPD’s

A

lithium
zirconium
silicon

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23
Q

dopant

A

contraction of doping agent

an element incorporated into a dental material to alter its mechanical properties, for example yttriea incorporated in a small amount into zirconia, resulting in stabalization

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24
Q

phase transformation toughening

A

zirconia micro structure change arrangment to beocme more resistance to crack propagation - slows down the crack but does not stop it

goes from TETRAGONAL PHASE TO MONOCLINIC PHASE – this transformation does not prevent crack but prevent from spreading

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25
Q

phase transformation toughening

A

zirconia micro structure change arrangment to beocme more resistance to crac propagation - slows down the crack but does not stop it

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26
Q

layered zirconia

A

can have core of zirconia and can put ceramic on the top

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27
Q

layered zirconia

A

can have core of zirconia and can put ceramic on the top

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28
Q

cementation layer thickness

A

20-50 microns

um

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29
Q

no more than ___ for veneering porcelain

A

no more than 2 mm

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30
Q

examples of metal -ceramic

A

high noble, noble, base

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31
Q

examples of all-ceramic

A

alumnious oxide, lithium dislicate, zirconia

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32
Q

all polymer examples

A

fiberkor, fiber glass

33
Q

noble are

A

Au, Pt, Pd, Rh, Ru, Ir, Os

34
Q

high noble vs noble vs base

A

high nobel - 60% nobel or greater than 40% gold

nobel is 25 % noble (<40% gold / Au)

base less than 25 % noble

meaning % of weight of Au, Pt, and or Pd comp

35
Q

characteristics of all metal - gold

A

high density

cast in gypsum investment

thin castings, beveled tooth prep margins

partial crown retainers

36
Q

metling of gold

A

1550-1700 F (850-925 C)

37
Q

partial crown retainers?

A

materials like gold are good because conserve tooth structure and allow for supra gingival preps

*more advanced prepping - grooves and boxes needed

38
Q

metal ceramic aka

A

feldspathic porcelain

high fusing temp - 90-980

low fusin 750-770 C

39
Q

veneering porcelain

A

must have opalescence and translucency

stimualte natural teeth

need coefficient of thermal expansion to be simialr as possible

must not abrade opposing

less then 2mm thicjness (average 1.2 -1.5 mm)

40
Q

breakdown of porcelain bond

A

chemical and physical

failure with cohesive and adhesive is possible

41
Q

failure of porcelain bond

A

adhesive – metal can be exposed

cohesive – fracture - ceramic chips off

42
Q

metal ceramic abutment tooth prep details - include requirement of reduction

A

functional cusp reduction 1.5- 2 mm

cervical reduction - 1.5mm

lingual reduction - 1 mm

must break interproximal contact

biplanar buccal reduction

43
Q

minimum thickness for alloy in metal ceramic design

A

0.3-0.5 mm

use a chamfer prep

44
Q

what to consider in molars when looking for abutments

A

2nd and 3rd molar roots may be too tapered

molar root proximity creates difficulty for preparation, impression, maintenance

45
Q

antes law

A

the abutment should have total periocemental area - PDL equal or greater than the area of replacement teeth

46
Q

span deflection details

A

1 unit of deflection is 8x greater if ditance is 2 units

and 27 x greater if distance is 3 units

47
Q

pontic with worst esthetics

A

ridge lap

48
Q

for three unit posterior - consenus on material choice

A

zirconia- based systems are indicated ; chippping of veneering ceraic on zirconia restorations remains an issue

49
Q

pressed on zirconia ceramics

A

technique designed to produce a deired form by injecting a molten homogenoius ceramic material into a mold containing a zirconia framework that may be veneered with porcelain

50
Q

ideal thickness of the adhesive layer

A

20-50 um

51
Q

multi-link

A

what we use to bond - like with emax crowns

52
Q

rely-x

A

what we use to cement - like with zirconia

53
Q

effect of the cement interface

A

critical load to radial fracture rises as the adhesive elastic modulus increases but drops for thicker cement layers

want thinner cement / but adequate when possible

54
Q

fracture in the connector area?

A

usually starts at the gingival embrassure of the connector

do NOT adjust the gingival side of the connector after ceramming

55
Q

if zirconia going to fail in FPD likely due to

A

biologic and technical complications other than the framework fracture

56
Q

common reason for failure with FPD’s made of glass ceramics or glass infiltrated ceramics

A

fracture of the reconstruction (framework and veneering ceramic)

57
Q

porcelain thickness in metal - ceramic

A

1.5-2.0 mm with metal support

58
Q

metal ceramic surface degrees?

A

at least 90 degrees

59
Q

occlusal contacts with metal ceramic

A

occlusal contacts 1.5 mm away from metal ceramic junction

60
Q

lingual supporting collar?

A

in a metal- ceramic it is at the HOC - height of contour

61
Q

metal - ceramic deign thickness

A

less then 2mm

62
Q

mutually protected occlusion

A

anterior teeth protect the posterior teeth by disclusoin during excursions and preventing lateral impact force vectors

while the posterior teeth protect the anterior teeth by providing stable maximal intercuspal position at occlual vertical dimension

63
Q

in diagnosis and tx plan what do you need to assess

A

smile line, phonetics, anatomy, midline, vertical overlap, horizontal overlap, anterior guidance

do wax up!
- mock up and interim FPD

64
Q

tetragonal and cubic temps

A

tetragonal – above 1170

cubic – above 2370b

65
Q

zirconia require?

A

sintering after milling and is not as dimensionally stable as hot isostatically pressed zirconia which doesnt need sintering

66
Q

monolithic at ? tetragonal at?

A

monolithic = room temp

tetragonal - above 1170

67
Q

what is lithium dislicate

A

classified as a glass-ceramic, in the class of particle filled glass materials

68
Q

materials that can be used for veneers

A

intra-coronal resotrations and crowns for anterior teeth

69
Q

effective material for anteiror 3 unit FPD’s

A

evidience shown effectiveness in lithium dislicate, alumina, and zirconia

70
Q

3 units involving a molar material to use?

A

research suggests that only zirconia based systems are indicated

as chipping of veneering ceramic on zirconia restorations remains an issue

71
Q

T/F there is evidence to support the universal application of a single ceramic material and system for all clinical situations

A

FALSE

– no one material good for every place

72
Q

internal stresses in veneering porcelain?

A

low thermo conductivity –which can lead to internal stresses in the veneering porcelain (rate of cooling)

73
Q

chipping relationship to venner thickness

A

if veneer thickness greater than core thickness than two-fold greater the chipping

so Zr-oxide core needs to support the veneering porcelain

74
Q

adhesive resin

A

any resin material with incorporated adhesive chemical such as MDP, an organophosphate, or 4-META ad related carboxyl - modified acrylic resins

75
Q

1.5 mm thick ceramic on dentin? in terms of adhesive layer thickness

A

10 um adhesive layer has a critical load of about 80% of its theoretical value

a 100 um thic adhesive layer has a 50% critical load of its theoretical value

76
Q

higher fracture loads related to?

A

thinner cement film thickness

77
Q

zirconia modifications for adhesive resins

A

for practical purposes - ZIRCONIA DOES NOT BOND
- but experiments looking into things like plasma sprayed – 3x increased bonding and micro pearls of low fusing porcelain - can increase bonding

78
Q

do not adust ____ of connector ____ ceramming

A

do not adjust the GINGIVAL SIDE of the connector AFTER ceramming

79
Q

minimum dimension for an anterior 3 unit all ceramic FPD in terms of incisal cervical and buccal - lingual

A

3mm for I-C and 2 mm in B-L

increasing the gingival embrassure can increase the fracture resistance

Fixed Prosth 3rd year (17 decks)

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