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Dental Materials > Impression Materials > Flashcards

Impression Materials Flashcards

1
Q

Types of Impression Materials

A

Inelactic/rigid, Elastometric: Aqueous + Nonaqueous

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2
Q

Inelastic/Rigid Types

A

Plaster, Wax, Zinc Oxide Eugenol (ZOE), better for edentulous areas

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3
Q

Plaster characteristics

A

[gypsum] rarely used, fractures easily

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4
Q

Wax characteristics

A

tray shaped or sticks/cones, thermoplastic (softens when heated, hardens when cooled : reversible)

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5
Q

Zinc Oxide Eugenol

A

[ZOE] (inelastic/rigid) 2 pastes: zinc oxide + oil of cloves/eugenol. used for custom trays of edentulous pts

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6
Q

Colloid

A

suspension of one material in another

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7
Q

Reversible Hydrocolloid

A

physical reaction, ie. Agar

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8
Q

Irreversible Hydrocolloid

A

chemical reaction, ie. Alginate

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9
Q

Agar

A

(reversible) hydrocolloid. pre-mixed, 3 water tanks

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10
Q

Alginate

A

(irreversible) hydrocolloid. powder + water = gel. water temp controls rate of setting

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11
Q

Alginate Powder Ingredients

A

potassium alginate, calcium sulfate, diatomaceous earth (filler), color/flavor, antimicrobial agent, gycol (coating)

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12
Q

Tear Strength: Influences

A

amount of material, rapid removal - min 1 min after gelation

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13
Q

Advantages of Hydrocolloids

A

inexpensive, easy to use

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14
Q

Disadvantages of Hydrocolloids

A

syneresis (water evaporates), absorbs water, poor stability

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15
Q

Nonaqueous Elastomeric Impression Materials

A

polysulfide, condensation silicone, polyether, polyvinyl siloxane (PVS) … chemical reaction > polymer
BASE + ACCLERATOR
more stable, excellent reproduction, high tear strength

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16
Q

Retraction Cord

A

pushes back gingiva, hemostatic: controls bleeding, allows material to flow into margins

17
Q

“Good/Smart Wetting”

A

hydrophilic, bring materials into intimate contact w wet surfaces

18
Q

Polysulfides: disadvantages

A

smell/taste/stain, messy, long setting time (15min!)

19
Q

Condensation Silicones: disadvantages

A

not popular, pour immediately, hydrophobic

20
Q

Polyether: advantages + disadvantages

A

accurate, hydrophilic, easy to pour

(stiff, sets quickly

21
Q

Silicone/Polyvinylsiloxanes PVS

A

most popular, hydrophilic, different viscosities, automix gun

22
Q

Thixotropic

A

stays where places and flows into sulcus - flows under pressure

Dental Materials (10 decks)

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