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Sp 15- Fixed Restorative Final > Cementation > Flashcards

Cementation Flashcards

1
Q

It is essential that both the casting and the tooth preparation are _____ and ____ prior to the cementation procedure.

A

Clean

Dry

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2
Q

What must be maintained during the entire set time of the cement?

A

A dry field

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3
Q

What are the four common types of luting agents?

A
  1. Zinc Phosphate Cement
  2. Zinc Polycarboxylate Cement
  3. Glass Ionomer Cement
  4. Composite Resin Cement
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4
Q

What is the main weakness associated with Zinc Phosphate?

A

It may cause moderate pulp irritation

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5
Q

What are four strengths associated with Zinc Phosphate?

  1. Adequate ______
  2. High ______
  3. Reasonable _____ ______
  4. Easy _____ ___ ______
A
  1. Strength
  2. Solubility
  3. working time (five mins)
  4. removal of excess
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6
Q

Mixing of Zinc Phosphate requires what materials and equipment?

A

Powder: Zinc Oxide
Liquid: Phosphoric Acid
Glass Slab for Mixing

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7
Q

What is the main difference between Zinc Phosphate and Zinc Polycarboxylate?

A

Zinc Phosphate may cause moderate pulp irritation, Zinc Polycarboxylate will NOT

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8
Q

Which has a shorter working time, Zinc Polycarboxylate or Zinc Phosphate?

A

Zinc Polycarboxylate

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9
Q

Which is easier when attempting to remove excess material, Zinc Phosphate or Zinc Polycarboxylate?

A

Zinc Phosphate

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10
Q

Zinc Polycarboxylate is intended for use in cementation of _______ because its rapid increase in film thickness may impede proper seating of a casting.

A

single metal units in low stress areas on sensitive teeth

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11
Q

What is the main disadvantage and main advantage to using Glass Ionomer Cement?

A

Disadvantage: susceptible to moisture contamination
Advantage: release of Fluoride

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12
Q

Glass Ionomer has a higher ______ than both Zinc Polycarboxylate and Zinc Phosphate.

A

Compressive Strength

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13
Q

In what two forms is Glass Ionomer available?

A
  1. Hand-Mixed (powder + liquid)

2. Capsulated

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14
Q

Composite Resin Cements are not suitable for use on ____.

A

Gold Castings

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15
Q

Resin Composite Cement bonds _____ to resin composite restorative materials and ______ porcelain.

A

Chemically

Silanated

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16
Q

Composite resins will bond ____ to resin composite restorative materials and will bond ______ to sandblasted metal alloys.

A

Chemically

Micromechanically

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17
Q

Which cement allows for shade-matching?

A

Composite Resin

18
Q

The newest variety of cements is “resin-modified glass ionomer” which provides high _______, low _____, and _____ release.

A

Strength
Solubility
Fluoride

19
Q

Compare the strength of Resin-Modified Glass Ionomer to that of other cements.

A
  • **stronger than: zinc phosphate, zinc polycarboxylate, and some glass ionomers
  • **weaker than composite resin
20
Q

Resin modified Glass Ionomer is ______ soluble than glass ionomer but has similar adhesion properties and fluoride release.

A

Less

21
Q

BOARDS: On what kind of surface should cements be mixed?

A

On a thick, COOL, glass slab

22
Q

BOARDS: How should the glass slab, used for mixing cement, be cooled?

A

Run the slab under cold tap water for 15 minutes, then dry completely

23
Q

BOARDS: Why should the glass slab be cooled prior to mixing the cement?

A

The cool surface will increase the working time of the cement by slowing the exothermic chemical reaction

24
Q

What is the powder to liquid ratio for cements?

A

Powder: 1 inch diameter mound
Liquid: 8 drops per crown

25
Q

What are the advantages and disadvantages to an increased powder to liquid ratio when preparing cement?

A

Advantages: Improved Strength, reduced solubility
Disadvantage: Increased viscosity

26
Q

Into how many increments should cement powder be divided?

A

8

27
Q

What is the proper mixing technique for cement?

A

On a cool glass slab, divide the 1 inch mound of powder into 8 increments, drop 8 drops of liquid per crown onto the opposite end of the slab, incorporate one increment of powder into the liquid, mix for 10 seconds over a WIDE area of the glass, continue adding increments to the mix, evaluate cement thickness after half of the increments have been added

28
Q

What is the proper cement thickness?

A

Raise the spatula 1 inch above the glass slab and evaluate over 1-2 second time lapse. Ensure that there is a Thin band that forms

29
Q

What is the improper cement thickness?

A

Raise the spatula 1 inch about the glass slab and evaluate over 1-2 second time lapse. If a thick, wide band forms it is incorrect.

30
Q

True or False: If the cement mix is too thick, continue adding drops of liquid until reaching the desired viscosity.

A

FALSE: if it is too thick, discard and begin again. Adding liquid to the mix would interfere with the setting reaction and weaken the cement

31
Q

BOARDS: When the proper consistency of cement is reached, cover the _______ of the casting.

A

Axial Walls

do not FILL the casting with cement

32
Q

BOARDS: True or False: When applying cement, the axial walls of the casting and the prepared tooth should be lightly coated.

A

False: NEVER COAT the prepared tooth!

33
Q

______ a casting to seat has been shown to be ineffective and is liable to cause tooth fracture.

A

Malleting (forcing)

34
Q

BOARDS: Should you etch a tooth before cementation?

A

No, you want to protect the prepared tooth from leaking chemicals into microtubules. May even want to use varnish on the prep

35
Q

When seating a casting, place the casting on the prepared tooth and press firmly with your finger in the direction of _______.

A

The path of insertion

36
Q

Utilize a _______ motion when seating a casting.

A

Rocking

buccal-lingual rock…. the roll mesial-distal

37
Q

What should be done if the casting cannot be completely seated?

A

REMOVE IT IMMEDIATELY

38
Q

If the cement has set sufficiently, but the casting is not properly aligned, how will the casting be removed?

A

The only way is to CUT it off and START OVER at your expense

39
Q

What are some causes of incomplete seating?

A
  1. Luting agent too thick
  2. insufficient seating force
  3. Binding occured between axial walls of the prep and casting
40
Q

In a clinical setting, if the set time is 10 mins, firm pressure from biting on a cotton roll must be applied for ____mins. Moderate force is then needed for an additional ____mins.

A

4

6

41
Q

Remove excess cement with a(n) _______ moving _____ to the margins.

A

Explorer

Parallel

42
Q

When evaluating a cemented casting, there should be proper _____ ________, proper _________, and absence of ______.

A

Margin adaptation
Contours
Rocking-movement

Sp 15- Fixed Restorative Final (10 decks)

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