porcelain repair and crown sectioning Flashcards

1
Q

do we always fix the chipping

A

1) esthetics
2) plaque accumulation
3) sharp edges

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2
Q

indirect failures

A

1) leaking margin
2) recurrent caries
- if tooth is restorable => remove crown, address caries, replace crown
3) nonrestorable => extraction

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3
Q

porcelain repair

A

1 )chipped porcelain
2) chipped porcelain and metal exposed

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4
Q

chipped porcelain

A

1( diamond bur => HF etch => silane => bond
2) diamond bur => micro etch with AlO2 -> HF etch => silane => bond (strongest)

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5
Q

chipped porcelain and metal exposed

A

1) porcelain: diamond bur => micro etch with AlO2 (increase surface area only) => HF etch
2) exposed metal => siljet (clean with air no water)
3) silane/bond both substrates

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6
Q

diamond bur

A

1) scratches in porcelain - mechanical retention
2) lowest strength repair

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7
Q

microetch with AlO2

A

1) 50 micron AlO2 at 45 psi
- micromechanical
- silica based prior to HF application
- excellent for cleaning intaglio of gold, PFM

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8
Q

microetch with silject

A

1) tribochemically attaches silica to surface of metal, then appl silane
- very strong bond to metal, zirconia, and alumina

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9
Q

HF etch +silane

A

1) very strong bond to porcelain, LDS, especially following microetcher at 45 psi

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10
Q

zirconia primer

A

1) MDP
- improves bond strength to zirconia
2) component scotchbond universal
- z-prime and zirconia primer

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11
Q

danville microetcher

A

1 )45 -90 psi

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12
Q

tribochemically bonding

A

1) tribo - friction to rub
2) chemical - relating to chemistry
3) converts kinetic energy to thermal energy that fuses glass to a hard substrate

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13
Q

microetcher body with silject sand

A

1) makes it a bondable surface
2) high velocity silica balls will fuse to zirconia due to high pressure
- high temp at 1200C
3) portions of alumina will fall out, but some will stay

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14
Q

silane

A

1) a bifunctional molecule (coupling agent)
2) do not rinse with water like AlO2, you air thin
3) apply HF acid
4) forms a bond between organic resin molecules and silica quartz filler particles
5) acts as a wetting agent for adhesive resins, penetrating etched porcelain

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15
Q

safety of HF

A

1) wear PPE
- lab coat, gloves, mask, loupes
2) work within the mannequins mouth
- keep mannequin suction running
- direct handpiece spray plume into mouth
3) use constant HVE
4) never work over skin or tissue

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16
Q

HF properties

A

1) chemically etches porcelain, silica, glass
2) corrosive to metal
3) causes severe bio damage
3) metabolic imbalance, resp problems, arrythmia, cardia arrest
- up to 24 hours after exposure

17
Q

siljet

A

1) can cause air emphysema if pushed into soft tissue

18
Q

project chip in porcelain

A

1) use diamond t ocut MI corner of 3x3 eMax #9 crown
- cut MI 0.5 mm bevel
2) teflon tape on adjacent tooth
3) HF acid for 10 seconds (very carefully)
- apply from dappen dish microapplicator
- small bore HVE, large bore HVE with rinse
4) silane let air dry 60 seconds and gentle air thin
- do not allow to dry undisturbed
5) apply scotch bone universal for 20 seconds, air dry, light cure
6) composite applied and light cure for 40 seconds

19
Q

porcelain etch

A

1) 9% HF
2) extremely corrosive, reactive
- loss of vision
- readily penetrates skin

20
Q

apply porcelain etch

A

1) dappen dish
apply for 10 seconds
2) use HVE to remove it
- rinse it off with water
- spray rinse mannikins throat
3) keep HVE near the etch as it works
4) LDS needs to etch for 10 seconds

21
Q

silane and scotchbone

A

1) apply silane and scotchbond
2) then you can use composite

22
Q

isolation materials

A

1) rubber dam REQUIRED for HF
2) opal dam that hardens around soft tissue
3) etch arrest as a barrier and neutralizer of HF

23
Q

after suctioning off the isolation material

A

1) bone dry it
2) apply bonding material
3) create restoration