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D1S Fixed Restorative > Manual Questions > Flashcards

Manual Questions Flashcards

1
Q

Pros/Cons of elastic impression material:

Irreversible Hydrocolloid

A

P- Rapid set, low cost

C- Poor Accuracy and surface detail

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2
Q

Pros/Cons of elastic impression material:

Reversible Hydrocolloid

A

P- Hydrophilic, long working time, low cost, no custom tray required

C- Low tear resistance, low stability

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3
Q

Pros/Cons of elastic impression material:

Polysulfide Polymer

A

P- High tear strength

C- Messy, unpleasant odor, long setting time, fair stability

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4
Q

Pros/Cons of elastic impression material:

Addition Silicone

A

P- Dimensional stability, pleasant to use, short setting time

C- Hydrophobic, poor wetting, some release H2

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5
Q

Pros/Cons of elastic impression material:

Condensation Silicone

A

P- Pleasant to use, short setting time

C- Hydrophobic, poor wetting, low stability

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6
Q

Pros/Cons of elastic impression material:

Polyether

A

P- Dimensional stability, accuracy, short setting time

C- Set material very stiff, short working time

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7
Q

Recommended uses/precautions of:

Irreversible Hydrocolloid

A

U- Diagnostic casts

P- Pour Immediately

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8
Q

Recommended uses/precautions of:

Reversible Hydrocolloid

A

U- Multiple preparations, problems with moisture

P- Pour immediately, use only with stone

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9
Q

Recommended uses/precautions of:

Polysulfide Polymer

A

U- Most impressions

P- Pour within 1 hour and allow 10 min to set

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10
Q

Recommended uses/precautions of:

Addition Silicone

A

U- Most Impressions

P- Delay pour of some materials, avoid bubbles when pouring

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11
Q

Recommended uses/precautions of:

Condensation Silicone

A

U- Most Impressions

P- Delay pour of some materials, avoid bubbles when pouring

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12
Q

Recommended uses/precautions of:

Polyether

A

U- Most impressions

P- Careful to not break teeth when separating cast

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13
Q

Compare Condensation Silicone Rubber vs. Addition Silicone

A

Condensation Silicone Rubber: Pros- clean, pleasant for patient, highly elastic; Cons- Inaccurate (shrinkage), hydrophobic

Addition Silicone- Pros- More accurate (less shrinkage); Cons- Expensive, tough to remove from undercuts, bubbles possible

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14
Q

This impression material cures by condensation of terminal mercaptan groups catalyzes by lead peroxide or other catalysts

A

Polysulfide

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15
Q

This impression material cures by condensation of terminal hydroxyl groups by orthoalkylsilicates to form polymer and alcohol

A

Condensation Silicones

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16
Q

This impression material cures by free-radical polymerization with a platinum catalyst

A

Addition Silicone

17
Q

This impression material cures by ring opening of the ethylene-imine group.

A

Polyether

18
Q

What effects do proportioning and temp have on working/setting time of elastic impression materials?

A

All working times decrease with increased temps

Polysulfide- more catalyst -> less working time
Silicone- Minimally affected
Polyether- more accelerator -> less working time

19
Q

Sort the elastic recoveries (greatest to least) of polysulfide, silicone, and polyether impression materials. How does elastic recovery affect clinical usage?

A

Addition silicone > Condensation Silicone > Polyether > Polysulfide

Large elastic recovery -> smaller distortion of impression on removal

20
Q

Compare the flexibility is of polysulfide, silicone, and polyether impression materials.

A

Polysulfide > Condensation Silicone > Addition Silicone > Polyether

21
Q

What are the advantages of this advance in impression materials:
Addition Silicone with Hydrophilic Properties

A

Will wet tooth surface more readily during impression (bubbles less likely). Easier to electroplate.

22
Q

What are the advantages of this advance in impression materials:
Single-Viscosity Addition Silicone

A

A single material can be used as both low/high viscosity material for syringe-tray impression technique

23
Q

What are the advantages of this advance in impression materials:
Automatic Mixers

A

This method of mixing is quick and produces bubble-free mixes

D1S Fixed Restorative (7 decks)

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