Final Fall 2015 (Sdm 3)

Front 1

The lost wax technique uses ____ wax to produce crowns, inlays and veneers.

Back 1

Casting and inlay wax (1 &3)

Front 2

______ wax is used to produce patterns for metal castings through the lost wax technique.

Back 2

Inlay

Front 3

True Or false # 1

Range of temperatures at which each component of the wax will start to start to soften and then flow is referred to as melting point

Back 3

#1 false

Front 4

____ wax is used to adhere components of gypsum, metal, or resin together during fabrication and repair.

Back 4

Sticky wax

Front 5

True or false #2

Thermal expansion and contraction of waxes is greater than any other dental material

Back 5

#2 true

Front 6

The properties of waxes are ____________

Back 6

Melting range, flow, dimensional change

Front 7

True or false #3

The wax is used to form a base into which to pour a gypsum model is boxing wax

Back 7

#3 true

Front 8

True or false #4

Temperature and time of storage for inlay pattern wax increases distortion

Back 8

#4 true

Front 9

Material that is suitable for forming a mold into which a metal or alloy is cast

Back 9

Investment

Front 10

What are the requirements for investment materials?

Back 10

A, B, C, D

Front 11

Gypsum bonded investment material is limited to ______ casting

Back 11

Gold casting

Front 12

Type of investment materials used or high fusing alloys used in metal ceramic restorations and pressable ceramics

Back 12

Phosphate bonded

Front 13

True or false #5
Spatulation of the investment materials increases the setting expansion

Back 13

#5 true

Front 14

True or false #6

Dental investments materials are classified depending on the binder material

Back 14

#6 true

Front 15

True or false #7

Increasing the water/powder ration, decreases the setting expansion time

Back 15

True

#7

Front 16

For safety purposes always pour acid _________

Back 16

Into water

Front 17

In dental laboratories, Hydrochloric acid is primarily used for ________.

Back 17

Pickling

Front 18

Which component of Casting investments is associated with "reduction of oxidation"?

Back 18

Modifiers

Front 19

Most of gypsum investment expansion results from?

Back 19

Hygroscopic

Front 20

Muriatic acid is a trade name for ________

Back 20

Hydrochloric acid

Front 21

What is the importance of silica in dental investments

Back 21

It is a refractory skeleton

Front 22

Antiflux is used _________.

Back 22

To confine the molten solder to a definite area

Front 23

When considering "the rules for handling inlay wax", discussed in class a student will most likely have a better fitting casting if they ________

Back 23

Always reseal the margins just before investing and invest immediately

Front 24

Contamination by copper in a pickling solution will impart a ________ color to the pickling solutions

Back 24

Blue-green

Front 25

Hydrofluoric acid is most often used __________.

Back 25

To strip porcelain

Front 26

True or false 8

Waxes have a coefficient of expansion and tend to warp and distort when allowed to stand unrestrained

Back 26

#8 true

Front 27

During soldering, fluxes act to __________.

Back 27

Prevent contact of atmospheric oxygen with the hot surfaces of the metal which would cause oxidation

Front 28

True or false #9

Fluoride is a type of flux mainly used for chrome cobalt,

Back 28

#9 true

Front 29

Powder fluxes are used mainly for _________.

Back 29

Casting

Front 30

Fluxes containing H2O are used for __________.

Back 30

Electric soldering

Front 31

True or false #10

Type II inlay waxes have a lower flow in the mouth temperatures than type 1 inlay waxes

Back 31

#10 false

Front 32

The process of abrading a surface to eventually reduce the size of the scratches until the surface appears shiny

Back 32

Polishing

Front 33

The wearing away of a surface; irregular grooves or scratches are produces on a surface

Back 33

Abrasion

Front 34

abrasives in dentistry may be bound on the surface of:

Back 34

Burs, disks, wheels and stones

Front 35

Used to give metal a high luster

Back 35

Rouge

Front 36

In three grits; used to smooth metal or acrylic resin

Back 36

Pumice

Front 37

a powder is mixed with water to form paste

Back 37

Chalk

Front 38

Powder together with a binder. applied with a rag or brush wheel to smooth metal or acrylic resin

Back 38

Tripoly

Front 39

Used as an Arkansas stone

Back 39

Quartz

Front 40

arbor band mounted in a handpiece or lathe. Used to trim acrylic

Back 40

Emrery

Front 41

Used to finish gold; very fine

Back 41

Cuttlefish

Front 42

Highest MOH's Number

Back 42

Diamond

Front 43

True or false #11

Propane gas is cleaner and less hazardous than acetylene

Back 43

#11 true

Front 44

True or false #12

acetylene-compressed air may be used to melt a ceramic alloy

Back 44

#12 false

Front 45

Colorless gas with a garlic-like odor

Back 45

Acetylene

Front 46

This type of gas is normally used in the warmer regions of the U.S.

Back 46

Butane

Front 47

True or false #13

When organic matter decomposes, it forms propane gas

Back 47

#13 false

Front 48

The temperature at which a substance changes from a liquid to a gas

Back 48

Boiling point

Front 49

gas with a triple bond

Back 49

Acetylene

Front 50

What is the smallest unit of matter that can exist as a stable independent entity?

Back 50

Atom

Front 51

Noble metals are defined by their:

Back 51

Resistance to corrosion

Front 52

When an 18Kt crown with BHN of 84 and a melting range of 1525°F1630°F is being soldered into a bridge, 650 fineness solder in the form of wire is going to be used. What percentage of this solder alloy in yellow gold?

Back 52

65%

Front 53

12 kt gold is the same as __________ fineness

Back 53

500 fineness

Front 54

Copper imparts a ______ color to gold alloys

Back 54

Red

Front 55

pure metals are characterized by ________.

Back 55

Melting point

Front 56

Heat hardening is accomplished by:

Back 56

Slow Cooling

Front 57

What alloy is more commonly used for partial denture frameworks?

Back 57

Type IV

Front 58

In the grain structure lecture, the attraction of alloy component atoms or unit cells for one another are responsible for the "failure" of an alloy when:

Back 58

the load applied to the alloy was greater than the ultimate attractive force between atoms.

Front 59

How many grains are there per pennyweight?

Back 59

24

Front 60

When malleability increases in an alloy, what usually happens to ductility?

Back 60

It will also increase

Front 61

True or false #14

A unit cell is the smallest repeating unit of atoms fundamental to the properties of the alloy crystal. (simple bulling block)

Back 61

#14 True

Front 62

True or false #15

Grain structure is an orderly arrangement of an alloys component atoms or unit cells

Back 62

#15 true

Front 63

True or false # 16

Faced centered cubic unit cells represent the type of crystals formed by AU type alloys

Back 63

#16 True

Front 64

True or false #17

Predominant base alloys from body centered cubic cell crystals

Back 64

#17 True

Front 65

True or false #18

Imperfections in lattice structure are related to physical properties such as hardness, softness, resilience, etc.

Back 65

#18 True

Front 66

When alloy is made to be softer it also becomes ____ malleable.

Back 66

More

Front 67

Which of the following elements, when added to gold alloy, increases the hardness greatly?

Back 67

Copper

Front 68

If a AU alloy becomes work hardened it may be returned to a soften state by:

Back 68

Controlled heating and quenching

Front 69

When an AU alloy becomes work hardened it may reveal the following characteristic:

Back 69

The metal becomes hardened and brittle

Front 70

The process of modifying gold alloy grains from granular to fiber like grain structure is called:

Back 70

Cold working.

Front 71

What other major metals are found in gold alloys for dental use?

Back 71

Platinum, Palladium, Copper.

Front 72

_____ alloys are first cast but then shaped by mechanical forces into their final forms

Back 72

Wrought

Front 73

_______ bond, is responsible for many of the properties of metal's electrical and thermal conductivity, metallic luster and strength.

Back 73

Metallic

Front 74

What is ADA classification of a dental alloy containing 40% yellow gold, 12% platinum and 7% palladium.

Back 74

Noble

Front 75

What is ADA classification of a dental alloy with very hard characteristic.

Back 75

Type IV

Front 76

True or false #19

Porcelain metal alloy has a lower melting range than inlay gold metal

Back 76

#19 False

Front 77

True or false #20

It is a common practice to use the same crucible for both inlay gold alloy and porcelain gold alloy casting.

Back 77

False #20

Front 78

Identify causes of casting alloy porosity.

Back 78

Contamination of wax pattern, over heating of casing metal, gas trapped inside the mold, improper spruing

Front 79

Malleability is defined as:

Back 79

The ability to be mechanically formed

Front 80

When a molten (liquid) alloy freezes, crystals______ and ______ as the material cools.

Back 80

Form;Grow

Front 81

Which of the following statements is(are) true of dental alloy crystal structure and grain?

Back 81

1, 2 and 3 are true statements.

Front 82

Which of the following statements is(are) true of the density of an alloy?

Back 82

1 and 3 are true statements

Front 83

According to the ADA classification for dental casting alloys, high noble alloys must have a noble metal content of at least ______% by weight

Back 83

60

Front 84

The___________attaches to the impression abutment and is used to replicate the implant fixture for the laboratory cast.

Back 84

Implant analog