Science Of Dental Materials Final (First Year Student)

Front 1

Is salt an accelerator or retarder?

Back 1

Accelerator

Hint 1

Salt dries gypsum faster

Front 2

If you add more water to gypsum, the water acts as a what?

Back 2

Retarder

Hint 2

More water means more set up time

Front 3

Increasing spatulation revolutions is a what?

Back 3

Accelerator

Hint 3

Increasing oxygen decreases set up time

Front 4

Is warm water an accelerator or retarder?

Back 4

Accelerator

Hint 4

Heat decreases set up time

Front 5

Is Borax an accelerator or retarder?

Back 5

Retarder

Hint 5

Borax is boring

Front 6

Is decreasing the amount of gypsum in a mix an accelerator or retarder?

Back 6

accelerator

Hint 6

more water means....

Front 7

Is decreasing spatulation vigor an accelerator or retarder?

Back 7

Retarder

Hint 7

Less oxygen means more working time

Front 8

Gypsum will set ____ if it has been contaminated with a larger amount of water.

Back 8

Slower

Hint 8

More water means more working time

Front 9

You should never keep more than a ____ month supply of Gypsum in the lab

Back 9

6 months

Hint 9

Come on.

Front 10

Contact absorption happens when a bag, or box of gypsum is _____ causing water to condense underneath it and be absorbed into the gypsum

Back 10

Set directly on a concrete floor

Hint 10

Concrete locks in moisture

Front 11

Baseplate wax mainly consists of what?

Back 11

Paraffin Wax

Front 12

Undercut waxes are used to ______.

Back 12

Block out unwanted undercuts

Hint 12

Undercuts...booooo.

Front 13

Fats lower the melting range of wax: True or false?

Back 13

True

Front 14

Gums improve elasticity: True or false?

Back 14

True

Front 15

What is sometimes used as a substitute for carnuba wax?

Back 15

Ouricurry

Front 16

What are pattern waxes used for?

Back 16

To make a form (crown, denture base, etc...) which will later be duplicated with some other material.

Hint 16

Patterns copy...

Front 17

Does inlay wax contain Carnuba wax?

Back 17

Yes.

Front 18

Is disclosing wax used in the laboratory or clinic?

Back 18

In the clinic

Front 19

What type of baseplate wax is used in the Portland area due to our moderate climate?

Back 19

Medium

Hint 19

Not to cold, not to hot.

Front 20

Why is beeswax added to parent wax?

Back 20

To increase the flow of parent wax

Front 21

Ouricurry is a _____ wax?

Back 21

Vegetable

Front 22

Paraffin is a _____ wax?

Back 22

Mineral

Front 23

Microcrystalline is a _____ wax?

Back 23

Mineral

Front 24

Carnauba is a _____ wax?

Back 24

Plant

Front 25

Beeswax is a _____ wax?

Back 25

Animal

Front 26

An impression is a _____ reproduction of the patients tissue?

Back 26

Negative

Front 27

Impression plaster is a ____ material?

Back 27

Non-resilient

Front 28

When the lab receives an alginate hydrocolloid how quickly should it be poured up in dental stone?

Back 28

Immediately upon arrival

Front 29

agar hydrocolloids are ____ impression Materials?

Back 29

Reversible

Front 30

agar hydrocolloids has K2SO4 added to it to counteract the retarding affects of Borax: True or false?

Back 30

true

Front 31

The most common impression material for final denture impressions is :

Back 31

Mercaptan Rubber

Front 32

Borax is Inserted into an agar hydrocolloid to ____

Back 32

Increase the strength of the impression material

Front 33

Beta type polysilicones are the ones we use today: True or false?

Back 33

True

Front 34

All discussed polysulfides, polysilicones, and polysiloxanes are two tubes systems?: True or False?

Back 34

True

Front 35

Of the two tube systems impression materials which is the most expensive?

Back 35

Polyether

Front 36

How is the accuracy of Mercaptan rubber?

Back 36

Very good

Front 37

How is the accuracy of Alginate Hydrocolloid

Back 37

Fair

Front 38

How is the accuracy of Polysilicone?

Back 38

Excellent

Front 39

How is the accuracy of Polyether

Back 39

Excellent

Front 40

The usual ratio of mix for denture base acrylic is what?

Back 40

Three; one polymer slash monomer

Front 41

What is stage one of The mixed acrylic chemical reaction?

Back 41

"Sandy": Polymer beads are initially wetted, resembles what say

Front 42

What is stage two of The mixed acrylic chemical reaction?

Back 42

"Stringy":The material is stringy when pulled apart, long chain molecules begin to form

Front 43

What is stage three of The mixed acrylic chemical reaction?

Back 43

"Doughy": The acrylic It is workable without sticking to the hands, pack at this point.

Front 44

What is stage four of The mixed acrylic chemical reaction?

Back 44

Material breaks rather than stretches when put under tension, too late to pack

Front 45

Both long and short cure methods use the initial temperature of 163 degrees; true or false?

Back 45

True

Front 46

The high temperature hold time for long cure method is how long?

Back 46

30 minutes

Front 47

The shrinkage of heat cured acrylic is reduced because the mold is what?

Back 47

Over packed

Front 48

What year did DuPont corporation start selling denture base acrylics (methylmethacrylate) under the brand name lucite?

Back 48

1937

Front 49

Which of the following was not listed as a disadvantage of denture based acrylics?

Back 49

Weight

Front 50

What group of separators and super separator belong to?

Back 50

group 1

Front 51

What group of seperators is Gypsum/wax?

Back 51

Group 3

Front 52

What group of separators is Gypsum/Gypsum?

Back 52

Group 1

Front 53

What group does Talcum Powder belong too?

Back 53

Group 5

Front 54

What group is Gypsum/Acrylic

Back 54

Group 2

Front 55

What group is Tin foil substitute?

Back 55

Group 2