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

dental ceramics for contemporary dentist Flashcards

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
Q

vita enamic is what type?

flexural strength?

A

resin matrix

170+-mpa

has lower translucency than other resin cermic hybrid materials might be related to the aluminum content

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26
Q

emax comes from

- breakdown

A

all ceramic
glass matrix ceramics
synthetic

it is a synthetic type

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27
Q

emax strneght

A

360 mpa +_ 40 mpa

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28
Q

CAD/CAM prosthesis must be __ after

A

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
Q

if make any adjusmtent then have to

A

POLISH IT

30
Q

POLISHING

A

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
Q

finishing and polishing also enhance

A

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
Q

smoothest surface seen is

A

polished!

polished was smoother than a glazed surface (previous gold standard)

33
Q

even if going to be glazed

A

need to be polished before

34
Q

gross adjustments ad pre polishing with?

A

exa cerapol wheel

if use this do not need to use the blue wheel in the blue pink and yellow

35
Q

pink wheel

A

medium

then grey

36
Q

obtain a high shine polish with

A

grey wheels and points

we also have white robinson brush that is white - with diamond paste

37
Q

T/F we have a polishing kit for poly cerams

A

true

38
Q

cementation

luting agents

A

any material used to attach or cement indirect restorations to prepared teeth

39
Q

cementation

non-adhesive

A

this traditional cement acts by filling a space and binding adjacent surfaces

40
Q

cementatin

adhesive

A

this category of cements CHEMICALLY interacts with the surface of the tooth and or restoration
adherence or bonding to the surface is involved

41
Q

resin modified glass ionomer cement
powder?
glass?

A

powder is glass – aluminum silicate fluoride glass

liquid – polyalkalnic acid + resin - hydrophilic resin (HEMA)

42
Q

advantages of resin modified glass ionomer cement

A

chemical bond / (acid from cement) resin bond

fluoride release

good compressive strength

easy to manipulate

43
Q

advantages of resin modified glass ionomer cement

A

expansion (hygroscopic)

soluble in oral fluids *

44
Q

filled resin cement advantage

A

bond to tooth
high compressive strength
essentially insoluble

45
Q

filled resin cement disadvantages

A

technique sensitive

very expensive

sensitivity to eugenol (poison the catalyst)

inhibition layer (cement line)

46
Q

radiogrpahs

  • how does an all ceramic appear?
  • how does the cement appear?
A

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
Q

illusion there is an open margin filled with resin material?

A

when an image is taken that bisects the margin at 90 degree angle

48
Q

material we can etch

A
  1. lithium dislicate (emax)
  2. celtra duo
  3. enamic
  4. feldspathic
49
Q

etch directions for lithium dislicate

A

20 seconds with 5% HF

50
Q

etch directions for celtra duo

A

apply 5- 9% hydrofl uoric acid etching gel - available separately
- to the INTERIOR of the restoration only
etching time is 30 seconds

51
Q

etch directions for enamic

A

60 seconds wit 5% HF or 30 seconds with 9% HF

52
Q

etchind directions for feldspathic

A

60 seconds wit 5 % HF

53
Q

multilink - if restoration has been etched already

A

if restoration has been previously etched and it has been re tried in the mouth , clean intaglio of restoration with ivoclean

54
Q

multilink etch what

A

the surface only – if it has bot been previously etched in the lab

55
Q

after etch next step in multilink

A

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
Q

implication of vital vs non-vital tooth with multilink

A

if vital – SELECTIVELY etch the enamel margins with phosphoric acid for 20 seconds

if non-vital – etch the ENTIRE tooth surface

57
Q

after etch the tooth with multilink procedure then what

A

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
Q

for adjustments start with

A

proximals then fit checker

take a radiograph if needed (and is recommended)

59
Q

isolation is most important during which steps

A

scanning and cementation

60
Q

after mxed drop of a and b and agitated tooth for 30 seconds - air dry , cement is in restoration then what?

A

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
Q

mark II and enamic gain strength from? implication on bonding

A

gain strength from bonding so want to make more adjustments after bonded on – to decrease liklihood of fracturing occcuring

62
Q

hydrofluoric acid vs phosphoric acid

- general

A

never put hydofluoric acid in the patients mouth

63
Q

etch everything basically besides

A

zirconia

64
Q

restoration should only be etched?

A

once - more than once - it can decrease the strength and can crack

if try in – need to be cleaned afterwards with ivoclean

65
Q

applying monobond where and when

A

intaglio of restoration for 1 minute - air dry

66
Q

primer with multilink is the

A

a and b

67
Q

best tool to tell if open closed margin

A

explorer and then fit checker

68
Q

first thing you do when get crown from lab

A

check proximal contacts first prior to doing anything

Fixed Prosth 3rd year (17 decks)

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