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OSCE > Dental Materials > Flashcards

Dental Materials Flashcards

1
Q

What does alginate contain?

A

Seaweed extract

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2
Q

What are the advantages of alginate?

A

Easy to use

Can be used for all types of impressions

Can be withdrawn from undercut areas without distortion, tears or fractures

Cheap

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3
Q

What are the disadvantages of alginate?

A

Impressions can distort; specific handling required to prevent distortion

Best models are obtained by casting up immediately

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4
Q

What needs to be used with alginate when taking impressions?

A

(Tray +) tray adhesive

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5
Q

What is the ratio used with alginate?

A

1 scoop : 1 “cup” of water

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6
Q

Why do we mix alginate?

A

Remove air bubbles and lumps

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7
Q

How do we clean up after mixing alginate?

A

Wipe bowl and spatula clean with paper towels (clinical waste)

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8
Q

What do we do after taking an impression with alginate?

A

Rinse impression under running water

Place in perform for 10mins

Rinse again (decontamination)

Wrap in damp gauze and place in airtight sealable bag

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9
Q

What does IRM consist of?

A

(Intermediate restorative material)

Zinc oxide and eugenol

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10
Q

What is the ratio used with IRM?

A

2 scoops : 3 drops

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11
Q

What is IRM used for?

A

Temporary fillings

Non-irritant linings for deep cavities

Sedative dressings for painful various teeth

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12
Q

What are the advantages of using IRM?

A

Soothing and non-irritating to pulp

Can be used as a sedative lining under permanent restorations

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13
Q

What are the disadvantages of using IRM?

A

Too soft and slow-setting to use as a foundation for a permanent filling in one visit

Not compatible with composite fillings

Some patients may be allergic to preparations containing eugenol

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14
Q

What are the ratios for polycarboxylate cement?

A

2 scoops : 1 drop of water for thick mix

1 scoop : 2 drops of water for lining mix/cementing

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15
Q

What are the advantages of using polycarboxylate cement?

A

Less irritant than other cements

More adhesive to dentin than other cements

Can be used to cement inlays, crowns and orthodontic bands

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16
Q

What are the disadvantages of using polycarboxylate cement?

A

Difficult to manipulate as it is adhesive to instruments

Very difficult to remove from instruments when dried

17
Q

What do you mix IRM on?

A

Cellulose mixing pad/thin glass slab

18
Q

How do you handle the components of IRM?

A

Invert bottle/shake to loosen powder and tap top to prevent puff of dust on opening

Level scoops

Divide powder into 4 sections

Dispense liquid separate from powder by holding bottle in palm of hand

Wipe spatula immediately after mixing with a wet paper towel

19
Q

What are the two types of glass ionomer?

A

Fuji 2 (light cure)

Fuji 9 (chemical cure)

20
Q

What is glass ionomer made of?

A

Glass-like powder mixture of aluminosilicates

Liquid contains polyacrylic acid

21
Q

What is glass ionomer used for?

A

Restorations

Linings

Fissure sealants

Adhesive cements

22
Q

What are the outstanding properties of glass ionomer?

A

Releases fluoride - prevents further caries development around cavity

Bonds directly to enamel, dentin and cementum without acid etching

23
Q

What are the advantages of using glass ionomer?

A

Adheres to enamel, dentin and cementum

Ideal for class V cavities

Excellent marginal seal

Releases fluoride over time

Aesthetically better than amalgam

24
Q

What are the disadvantages of using glass ionomer?

A

Lower strength than amalgam and composites

Very exact handling required for correct placement

Easily ruined by moisture contamination

Mix must have exact proportions to produce optimal set

25
Q

What type of glass ionomer is used in moisture-susceptible areas?

A

Fuji 2 light cure as faster curing

Shallower cavities

OSCE (3 decks)

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