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Fixed Prosth 3rd year > dental ceramics for contemporary dentist > Flashcards

dental ceramics for contemporary dentist Flashcards

(68 cards)

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1
Q

butt margin implication

A

porcelain on facial metal on the lingual

PFM

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2
Q

lithium disilicate is

A

emax

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3
Q

“blue state” refers to what and why

A

emax - lithium dislicate glass ceramic

when blue composed primarily of lithium metasilicate - which is EASIER TO MILL AND RESULTS IN LOWER BUR WEAR

after milling process completed - the material is heat treated and glazed in one step, forming the final lithium dislicate, prepared for CAD/CAM use

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4
Q

glass matrix ceramics gets broken down to

A
  1. feldspathic
  2. synthetic
  3. glass infiltrated
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5
Q

main type of porcelain that is applied on PFM’s today

A

Feldspathic

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6
Q

feldpahic porcelain is made of

A

traditional group of ceramic based on a ternary material

  • clay/ kaolin (hydrated aluminasilicate)
  • quartz (silica)
  • feldspar (potassim and sodium aluminasilicates)

examples = IPS empress esthetic, IPS emress CAD, IPS classic , ivoclar vivadent ; vitadur, Vita VMK , vitablocks

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7
Q

IPS emax ceram is?

A

emax reinorced with zirconia
- type of fluroapatite based

part of synthetic!

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8
Q

examples of synthetic

A
  1. leucite based
  2. lithium dislicate and derivates
  3. fluroapatite- based
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9
Q

composition of synthetic

A

silicone dioxide
potassium oxide
sodium oxide
alumnium oxide

combined with apetite crystals or leucite

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10
Q

leucite ***

A

crystals REINFORCES the glass by defecting and arresting the propagation of cracks,
the residual glass with CTE (coefficient of thermal expansion) slighlty lower than the leucite crystals are put in compression, which further enhances the strength of glass ceramic

makes stronger
limit crack propagation

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11
Q

why do leucite glass ceramics present with good esthetic

A

because high and adjustable translucency and the possibility of coloring the glass in natural tooth shades through addition of metal oxide pigments

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12
Q

major example of polycrystalline ceramic we need to know

A

STABALIZED ZIRCONIA

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13
Q

glass matrix ceramics glass infiltrated

A

not used as much
alumina
alumina and magnesiu and alumina and zirconia

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14
Q

describe polycrystalline ceramics

A

major off the all ceramics (like own category)

aluminum oxide, stablized zirconia, zirconia toughened alumina and Alumina toughened zirconia ZTA and ATZ

fine grain crystalline structure, provides strength and fracture toughness

limited translucency due
to the absence of glass phase

difficult to etc with hydrophloric acid

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15
Q

why major failings with zirconia

A

didnt understand the cooling properties

and CTE properties

gets hot and then dos not cool at the same rate

MISMATCH OF THE CTE

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16
Q

patient bruxer give? why

A

zirconia – because fine grain crystalline structure - provides strength and fracture toughness

but this also the reason why it is more opaque – if fine crystalline structure - no room for light to come through

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17
Q

example of resin matrix ceramic

A

enamic

organic matrix highly filled with ceramic particles

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18
Q

greater crystalline content results in

A

higher flexural strength but also can decrease translucency

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19
Q

general rule for relationship between strength and esthetics

A

inverse

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20
Q

what happens when light passes through a translucent material

A

***reduced by the scattering of small sized particles, such as filler particles and porosity voids

the portion of incident light that emerges as diffuse transmission is essential for coloour perception and appearance of dental ceramics

loose matrix - more optical properties

vs zirconia - dense matrix – cant pass through

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21
Q

example of feldspathic porcelain

A

vita mark II Feldspar ceramic

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22
Q

flexural strength of vita mark II Feldspar ceramic

A

125 +- 10 mpa

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23
Q

most esthetic porcelain

A

vita mark II Feldspar ceramic

presented with more translucency than IPS emax CAD at both .5 and 1.0 mm thickness

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24
Q

if lower translucency - may be due to

A

the alumina content

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25
vita enamic is what type? | flexural strength?
resin matrix 170+-mpa has lower translucency than other resin cermic hybrid materials might be related to the aluminum content
26
emax comes from | - breakdown
all ceramic glass matrix ceramics synthetic it is a synthetic type
27
emax strneght
360 mpa +_ 40 mpa
28
CAD/CAM prosthesis must be __ after
washed and the milling process does not create a smooth surface ready for cementation -- the ceramic material must be contoured and finished post-milling to make it ready for delivery two types of ceramic materials avalaible for chairside CAD/CAM restorations that can be - hand-finished - glaze fired in a porcelain oven
29
if make any adjusmtent then have to
POLISH IT
30
POLISHING
polishing must create a smooth surface to maximize the flexural strength of the restoration, minimize the risk of chipping or fracture, minimize abrasive wear of opposing teeth and restorations, and maximize biocompatibility by limiting adherence of bacteria to the surface of the restoraions
31
finishing and polishing also enhance
the esthetic appearance of the milled CAD/CAM restorations by resulting in a glossy surface that has similar reflection and refraction characteristics as natural teeth
32
smoothest surface seen is
polished! polished was smoother than a glazed surface (previous gold standard)
33
even if going to be glazed
need to be polished before
34
gross adjustments ad pre polishing with?
exa cerapol wheel if use this do not need to use the blue wheel in the blue pink and yellow
35
pink wheel
medium then grey
36
obtain a high shine polish with
grey wheels and points we also have white robinson brush that is white - with diamond paste
37
T/F we have a polishing kit for poly cerams
true
38
cementation | luting agents
any material used to attach or cement indirect restorations to prepared teeth
39
cementation | non-adhesive
this traditional cement acts by filling a space and binding adjacent surfaces
40
cementatin | adhesive
this category of cements CHEMICALLY interacts with the surface of the tooth and or restoration adherence or bonding to the surface is involved
41
resin modified glass ionomer cement powder? glass?
powder is glass -- aluminum silicate fluoride glass liquid -- polyalkalnic acid + resin - hydrophilic resin (HEMA)
42
advantages of resin modified glass ionomer cement
chemical bond / (acid from cement) resin bond fluoride release good compressive strength easy to manipulate
43
advantages of resin modified glass ionomer cement
expansion (hygroscopic) soluble in oral fluids *
44
filled resin cement advantage
bond to tooth high compressive strength essentially insoluble
45
filled resin cement disadvantages
technique sensitive very expensive sensitivity to eugenol (poison the catalyst) inhibition layer (cement line)
46
radiogrpahs - how does an all ceramic appear? - how does the cement appear?
ceramic material is radiolucent cement is opaque when an image is taken that BISECTS the margin at 90 degree angle, the overlap of the opaque material gives the illusion that there is an open margin filled with resin material
47
illusion there is an open margin filled with resin material?
when an image is taken that bisects the margin at 90 degree angle
48
material we can etch
1. lithium dislicate (emax) 2. celtra duo 3. enamic 4. feldspathic
49
etch directions for lithium dislicate
20 seconds with 5% HF
50
etch directions for celtra duo
apply 5- 9% hydrofl uoric acid etching gel - available separately - to the INTERIOR of the restoration only etching time is 30 seconds
51
etch directions for enamic
60 seconds wit 5% HF or 30 seconds with 9% HF
52
etchind directions for feldspathic
60 seconds wit 5 % HF
53
multilink - if restoration has been etched already
if restoration has been previously etched and it has been re tried in the mouth , clean intaglio of restoration with ivoclean
54
multilink etch what
the surface only -- if it has bot been previously etched in the lab
55
after etch next step in multilink
apply monobond to INTAGLIO of restoration for 1 minute -- air dry clean and dry tooth place mr thirsty if tooth is a lower molar
56
implication of vital vs non-vital tooth with multilink
if vital -- SELECTIVELY etch the enamel margins with phosphoric acid for 20 seconds if non-vital -- etch the ENTIRE tooth surface
57
after etch the tooth with multilink procedure then what
mix 1 drop of A and one drop of B togther apply to TOOTH and agitate for 30 seconds - air dry then dispence cement from syringe INTO RESTORATION
58
for adjustments start with
proximals then fit checker take a radiograph if needed (and is recommended)
59
isolation is most important during which steps
scanning and cementation
60
after mxed drop of a and b and agitated tooth for 30 seconds - air dry , cement is in restoration then what?
seat restoration with PRESSURE - clean interproximals with microbrushes and floss then wait for cement to begin to gel and clean the remainder - you can light cure for 1-2 seconds, but be careful not to overcure - take post op radiogrpah to check for excess cement once all is clean light cure polish margins with composite finishing burs -- only done if needed and only by faculty
61
mark II and enamic gain strength from? implication on bonding
gain strength from bonding so want to make more adjustments after bonded on -- to decrease liklihood of fracturing occcuring
62
hydrofluoric acid vs phosphoric acid | - general
never put hydofluoric acid in the patients mouth
63
etch everything basically besides
zirconia
64
restoration should only be etched?
once - more than once - it can decrease the strength and can crack if try in -- need to be cleaned afterwards with ivoclean
65
applying monobond where and when
intaglio of restoration for 1 minute - air dry
66
primer with multilink is the
a and b
67
best tool to tell if open closed margin
explorer and then fit checker
68
first thing you do when get crown from lab
check proximal contacts first prior to doing anything

Fixed Prosth 3rd year (17 decks)

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