Ch 46 Materials

Question 1

Hysteresis

Answer 1

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

Question 2

First bath for hydrocolloid

Answer 2

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

Question 3

Second bath of hydrocolloid

Answer 3

150 degrees serves as a storage bath

Question 4

Third bath of hydrocolloid

Answer 4

110 degrees for tempering after placed in tray

Question 5

Where does what material go after the second bath

Answer 5

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

Question 6

Regular/heavy-bodied materials/tray types

Answer 6

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

Question 7

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

Answer 7

20-30 min

Question 8

Agar

Answer 8

Gelatin-type material derived from seaweed

Question 9

Alginate

Answer 9

Irreversible hydrocolloid material used for taking preliminary impressions

Question 10

Base

Answer 10

Foundation or the basic ingredient of a material

Question 11

Border molding/muscle trimming

Answer 11

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

Question 12

Catalyst/accelerator

Answer 12

Substance that modifies of increases the rate of a chemical reaction

Question 13

Centric

Answer 13

Having an object centered

Question 14

Colloid

Answer 14

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

Question 15

Elastomeric

Answer 15

Materials having elastic properties from rubber

Question 16

Imbibition

Answer 16

Absorption of water

Question 17

Syneresis

Answer 17

Loss of water shrink

Question 18

Tempering

Answer 18

Bringing a material to desired consistency

Question 19

Potassium alignate

Answer 19

Thickening agent used in ice cream