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IODC intermediate clinical skills > CERAMIC SYSTEMS FOR INDIRECT RESTORATIONS > Flashcards

CERAMIC SYSTEMS FOR INDIRECT RESTORATIONS Flashcards

1
Q

what are ceramics

A

compounds of metallic and non metallic elements

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2
Q

what is the building block for ceramic

A 
silica
SiO2
gives rise to 
1) crystalline
2) amorphous
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3
Q

feldspathic ceramic

A 
weak
supported by either 
metal PFM
high strength ceramic substructure
bond to the tooth and therefore we use tooth as substructure
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4
Q

problems with metal ceramic productions

A 
problem making restoration - space (need sufficient space to fit and make ceramic lifelike)
aesthetics 
metal substructure prevents light transmittance
often appear opaque
metal margin can be seen
metal ceramic bond
metal ceramic junction
metal ceramic compatibility
support for ceramic
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5
Q

ceramic are best under and poor under

A

poor in tension

good in compression

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6
Q

thermal co expansion effects

A

heated they expand
ideally we want the same co efficient so no shrinkage or tension
- will result in radial cracks if co efficients not controlled

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7
Q

what do we want the TEC of ceramic to be

A

equal or slightly less of the metal

ceramics will have leucite placed to change this

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8
Q

how can ceramic be supported

A

metal substructure PFM
high strength ceramic substructure
bond to tooth and therefore we use tooth as a substructure eg resin bonded crown

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9
Q

high strength ceramic substructures available

A 
zirconia
- sintered and milled
can be CAD camed
range of translucency
very strong material (can be abrasive on tooth)
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10
Q

previous high strength ceramic substructures

A

porcelain jacket crown
glass infiltrated materials
pure alumina substructures

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11
Q

indications for zirconia

A

strength

aesthetics

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12
Q

resin bonded restorations examplees

A

venners
dentine bonded crowns
inlays onlays
partial crowns

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13
Q

most common resin bonded restoration

A

lithium disilicate eg emax

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14
Q

lecite glass ceramics and lab problems

A

RM - bonded to underlying tooth
restoration has to be etched so can bond to tooth surface

have to make refractory model produciton
duplicaiton of die may compound problems
lack of supporting structures

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15
Q

limitations of lecite glass ceramics

A

single units only
weak therefore anterior region only

  • rely on bonding to the underlying tooth structure
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16
Q

lithium diisilicate IPS e max

A

400 Mpa strength
pressed or milled
monolithic
resin bonded

17
Q

advantages of lithium disilicate

A

can be bonded to underlying tooth structure

provides structural integrity

IODC intermediate clinical skills (17 decks)

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