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

L4 - FPD's Flashcards

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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
phase transformation toughening
zirconia micro structure change arrangment to beocme more resistance to crac propagation - slows down the crack but does not stop it
26
layered zirconia
can have core of zirconia and can put ceramic on the top
27
layered zirconia
can have core of zirconia and can put ceramic on the top
28
cementation layer thickness
20-50 microns | um
29
no more than ___ for veneering porcelain
no more than 2 mm
30
examples of metal -ceramic
high noble, noble, base
31
examples of all-ceramic
alumnious oxide, lithium dislicate, zirconia
32
all polymer examples
fiberkor, fiber glass
33
noble are
Au, Pt, Pd, Rh, Ru, Ir, Os
34
high noble vs noble vs base
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
characteristics of all metal - gold
high density cast in gypsum investment thin castings, beveled tooth prep margins partial crown retainers
36
metling of gold
1550-1700 F (850-925 C)
37
partial crown retainers?
materials like gold are good because conserve tooth structure and allow for supra gingival preps *more advanced prepping - grooves and boxes needed
38
metal ceramic aka
feldspathic porcelain high fusing temp - 90-980 low fusin 750-770 C
39
veneering porcelain
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
breakdown of porcelain bond
chemical and physical failure with cohesive and adhesive is possible
41
failure of porcelain bond
adhesive -- metal can be exposed cohesive -- fracture - ceramic chips off
42
metal ceramic abutment tooth prep details - include requirement of reduction
functional cusp reduction 1.5- 2 mm cervical reduction - 1.5mm lingual reduction - 1 mm must break interproximal contact biplanar buccal reduction
43
minimum thickness for alloy in metal ceramic design
0.3-0.5 mm use a chamfer prep
44
what to consider in molars when looking for abutments
2nd and 3rd molar roots may be too tapered molar root proximity creates difficulty for preparation, impression, maintenance
45
antes law
the abutment should have total periocemental area - PDL equal or greater than the area of replacement teeth
46
span deflection details
1 unit of deflection is 8x greater if ditance is 2 units and 27 x greater if distance is 3 units
47
pontic with worst esthetics
ridge lap
48
for three unit posterior - consenus on material choice
zirconia- based systems are indicated ; chippping of veneering ceraic on zirconia restorations remains an issue
49
pressed on zirconia ceramics
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
ideal thickness of the adhesive layer
20-50 um
51
multi-link
what we use to bond - like with emax crowns
52
rely-x
what we use to cement - like with zirconia
53
effect of the cement interface
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
fracture in the connector area?
usually starts at the gingival embrassure of the connector do NOT adjust the gingival side of the connector after ceramming
55
if zirconia going to fail in FPD likely due to
biologic and technical complications other than the framework fracture
56
common reason for failure with FPD's made of glass ceramics or glass infiltrated ceramics
fracture of the reconstruction (framework and veneering ceramic)
57
porcelain thickness in metal - ceramic
1.5-2.0 mm with metal support
58
metal ceramic surface degrees?
at least 90 degrees
59
occlusal contacts with metal ceramic
occlusal contacts 1.5 mm away from metal ceramic junction
60
lingual supporting collar?
in a metal- ceramic it is at the HOC - height of contour
61
metal - ceramic deign thickness
less then 2mm
62
mutually protected occlusion
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
in diagnosis and tx plan what do you need to assess
smile line, phonetics, anatomy, midline, vertical overlap, horizontal overlap, anterior guidance do wax up! - mock up and interim FPD
64
tetragonal and cubic temps
tetragonal -- above 1170 cubic -- above 2370b
65
zirconia require?
sintering after milling and is not as dimensionally stable as hot isostatically pressed zirconia which doesnt need sintering
66
monolithic at ? tetragonal at?
monolithic = room temp | tetragonal - above 1170
67
what is lithium dislicate
classified as a glass-ceramic, in the class of particle filled glass materials
68
materials that can be used for veneers
intra-coronal resotrations and crowns for anterior teeth
69
effective material for anteiror 3 unit FPD's
evidience shown effectiveness in lithium dislicate, alumina, and zirconia
70
3 units involving a molar material to use?
research suggests that only zirconia based systems are indicated as chipping of veneering ceramic on zirconia restorations remains an issue
71
T/F there is evidence to support the universal application of a single ceramic material and system for all clinical situations
FALSE | -- no one material good for every place
72
internal stresses in veneering porcelain?
low thermo conductivity --which can lead to internal stresses in the veneering porcelain (rate of cooling)
73
chipping relationship to venner thickness
if veneer thickness greater than core thickness than two-fold greater the chipping so Zr-oxide core needs to support the veneering porcelain
74
adhesive resin
any resin material with incorporated adhesive chemical such as MDP, an organophosphate, or 4-META ad related carboxyl - modified acrylic resins
75
1.5 mm thick ceramic on dentin? in terms of adhesive layer thickness
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
higher fracture loads related to?
thinner cement film thickness
77
zirconia modifications for adhesive resins
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
do not adust ____ of connector ____ ceramming
do not adjust the GINGIVAL SIDE of the connector AFTER ceramming
79
minimum dimension for an anterior 3 unit all ceramic FPD in terms of incisal cervical and buccal - lingual
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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