Ch 46 Materials Flashcards Preview

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Flashcards in Ch 46 Materials Deck (19):
1

Hysteresis

Change in temp that causes the reversible hydrocolloid material to transform from one physical state to another

2

First bath for hydrocolloid

Liquifies the semi solid material at 212 degrees. It's called a hydrocolloid conditioner.

3

Second bath of hydrocolloid

150 degrees serves as a storage bath

4

Third bath of hydrocolloid

110 degrees for tempering after placed in tray

5

Where does what material go after the second bath

Light-bodied material placed in syringe; heavy-bodied placed in the tray moved to tempering bath

6

Regular/heavy-bodied materials/tray types

Thicker than light-bodied. Fill tray. Stiffness forces light bodied into close contact with prepped tooth for accurate impression

7

How long do you wait before pouring models for stress relaxation to occur

20-30 min

8

Agar

Gelatin-type material derived from seaweed

9

Alginate

Irreversible hydrocolloid material used for taking preliminary impressions

10

Base

Foundation or the basic ingredient of a material

11

Border molding/muscle trimming

Process of using fingers to contour a closer adaption of the margins of an impression while still in the mouth

12

Catalyst/accelerator

Substance that modifies of increases the rate of a chemical reaction

13

Centric

Having an object centered

14

Colloid

A suspension of particles in a dispersion medium such as water. Sol and gel

15

Elastomeric

Materials having elastic properties from rubber

16

Imbibition

Absorption of water

17

Syneresis

Loss of water shrink

18

Tempering

Bringing a material to desired consistency

19

Potassium alignate

Thickening agent used in ice cream