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Au 15- Fixed 3 Final Exam > Cementation Techniques > Flashcards

Cementation Techniques Flashcards

1
Q

True or False: Long term failure mechanism is unknown for single Zirconia crowns.

A

True

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2
Q

Ziconia is a _____ not a _____.

A

ceramic

metal

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3
Q

Why is there concern about Zirconia transforming over time and creating flaws that lead to failures?

A

it is metastable….low temperature degradation

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4
Q

During stress corrosion, where does the stress occur?

A

on the underside of the crown

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5
Q

Silanes put a ______ coating on glass particles.

A

hydrophobic

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6
Q

Silica-based ceramics should be bonded with _____ cements to improve strength.

A

resin

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7
Q

Non-silica based ceramics are ______ to bond.

A

difficult

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8
Q

Non-silica based ceramics are strong enough to use _____ cements.

A

conventional

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9
Q

What are the two broad categories of cements/luting agents?

A
  1. Water-based

2. Resin-based

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10
Q

What are the three water-based cements?

A
  1. zinc phosphate
  2. polycarboxylate
  3. glass ionomers
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11
Q

What is polycarboxylate a combination of?

A

ZO fillers + liquid of Glass Ionomer

its a combo of the other two water-based cements

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12
Q

Why is Zinc Oxide tedious?

A

you must mix it (and it heats up, so you need cooled glass slab)

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13
Q

Glass ionomers have a stable interface and release fluoride, but they are fairly ______.

A

soluble

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14
Q

True or False: Resin Ionomers are more soluble than GI.

A

False, less soluble

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15
Q

Composites and Compomers are _____-based cements.

A

resin

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16
Q

What type of connections (2) exist between the tooth and crown and is filled by cement?

A

mechanical (mostly) and chemical

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17
Q

The key to good cements include: _____film thickness, and _____ working time.

A

low

long

18
Q

Do we want a long or short setting time?

A

short

19
Q

Cement should have a ______ compressive strength and an elastic modulus that is similar to _____.

A

high

dentin

20
Q

Ideal cement has ______ solubility and _____ microleakage.

A

very low-none

very low-none

21
Q

Which type of cement should you use for metal or metal-ceramic crowns?

A

water based (ZO, resin modified GI)

22
Q

Which type of cement should you use for all-ceramic that are silica based?

A

resin cements

23
Q

Which type of cement should you use for all-ceramic crowns that are zirconia based?

A

water based or resin based

zirconia doesn’t need extra reinforcement

24
Q

True or False: For stronger ceramics, it is common to use resin based cements because the ceramic doesn’t need reinforcement from stronger bonding agents.

A

False: water-based cements can be used for stronger ceramics (zirconia)

25
Q

True or False: Adhesive Resins have a higher compressive strength.

A

True

26
Q

Dentin is etched with ______% phosphoric acid or self-etch adhesive.

A

35

27
Q

Which step is being removed from many resin systems because it can cause post op sensitivity?

A

etch

28
Q

Why does the etching step cause sensitivity?

A

it removes smear plugs and demineralizes dentin, which exposes tubules

29
Q

Self-etching adhesives will etch dentin during the ______ _______. This minimizes chances of sensitivity by may form a weaker bond.

A

adhesive application (good interface makes this possible)

30
Q

What kind of acid etchant is used for silica based ceramics?

A

hydrofluoric acid (5.5-5.9 HF)

31
Q

True or False: Zirconia based ceramics cannot be etched with hydrofluoric acid.

A

true

32
Q

After etching silica based ceramics, what is the next application step?

A

apply silane coupling agent

33
Q

The reaction of silane coupling with ceramic surface is known as _____.

A

condensation

34
Q

What is the purpose of using a silane coupling agent?

A

the long carbon chains and hydroxide groups are hydrophobic and the hydrogen atoms must be removed so that the oxygen can chemically attach to silane

35
Q

True or False: Zirconia is cemented similarly to metal but the inner surface is rough.

A

False: zirconia is cemented similar to metal BUT the inner surface is NOT rough

36
Q

What are the two conventional methods for cementation of metal to tooth?

A
  1. Mechanical Lock

2. Chelation (ionic bonds)

37
Q

What is the functional group in Glass Ionomer and RMGI?

A

carboxylic acid

38
Q

True or False: Conditioners clear the smear layer and demineralize tooth structure.

A

False: they only clear the smear layer…no demin

39
Q

Rely X is commonly used to cement Zirconia to tooth structure. What is Rely X Luting Cement?

A

an RMGI luting cement

40
Q

What are two characteristics of Phosphate Ester Based Cements when applied to Zirconia?

A
  1. Mechanical Bonding is minimal
  2. Stronger Ionic Bonding than carboxylic acid (RMGI)
    * example: Rely X Unicem*

Au 15- Fixed 3 Final Exam (2 decks)

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