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1
Q

What is a defining characteristic of a solid

A

That it has shape and volume and

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2
Q

Two ways to measure hardness

A

Knopf test, Rockwell test

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3
Q

Ultimate strength

A

The maximum amount of stress a material can withstand without breaking

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4
Q

What does modulus mean?

A

Stiffness

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5
Q

What is proportional limit

A

The greatest stress a structure can withstand without permanent deformation

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6
Q

What is ductility

A

The amount of dimensional change a material can withstand without breaking
Materials with poor ductility are classified as brittle

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7
Q

Viscosity

A

Is the resistance of a liquid to flow
Thin fluids have low viscosity
Thick fluids have high viscosity

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8
Q

Thixotropic materials

A

Are liquids that flow more easily under mechanical force

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9
Q

Therapeutic materials

A

Used in the treatment of disease

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10
Q

Would liquid be considered the catalyst or the base?

A

Catalyst

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11
Q

Manipulation stage

A

Mixing and working time

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12
Q

Reaction stage

A

Initial and final set

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13
Q

Initial set time

A

This time begins when the dental material no longer can be manipulated in the mouth

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14
Q

What happens if you increase the amount o liquid or water

A

Final product might become weaker

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15
Q

Is and impression a negative or positive reproduction

A

Negative

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16
Q

What are the two forms of impression material

A

Elastic and inelastic(rigid)

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17
Q

Which ones are rigid impression materials

A

ZOE
COMPOUND
PLASTER

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18
Q

Which ones are elastic impression materials

A 
Polysulfide 
Polyether
Silicone 
Agar 
Alginate
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19
Q

Hydrocolloids

A

Hydrocolloids are water based colloids that function as elastic impression materials

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20
Q

What are the two types of hydrocolloids

A

Irreversible

And reversible

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21
Q

Liquid state in which colloidal particles are suspended by cooling or chemical reaction it can change into a gel

A

Sol

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22
Q

A semisolid state in which colloidal particles form a framework that traps liquid

A

Gel

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23
Q

What is a retarder in alginate

A

Trisodium phosphate

Used in regular set

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24
Q

80% H2O contains potassium sulfate, borax, alkyl benzoate

A

Agar

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25
Reversible hydrocolloid
Agar
26
Which impression material changes from a sol phase to a gel phase via chemical reaction and is a irreversible hydrocolloid?
Alignate
27
Which impression material has poor tear strength?
Irreversible hydrocolloid | Alginate
28
Syneresis
Shrinkage
29
When would you use an alginate impression material
When you are working in a wet environment Preliminary When you need impression of subgingival tissues Have to pour models You don't need to much detail in the impression
30
What are disadvantages of alginate
Shrinkage Swelling Poor tear strength Burning tissues-client care
31
Imbibition
Swelling
32
What details do you want in an upper maxillary impression material
Palatial vault and Hamular notch
33
What areas for the mandibular do you want in your impression
Retromolar areas and lingual extensions
34
How can you tell you understated an alginate impression
Lack alginate in the vestibular area
35
Elastomeric material
They have qualities similar to rubber They are composed of a base and an accelerator or catalyst Used for impressions of preparation and for demanding or highly accurate reproductions They have different viscosities putty, heavy, regular , or light body
36
Which elastomeric material has shorter working times, and mixing reaction causes ethyl alcohol to form and be released causing shrinkage
Condensation silicone
37
Which elastomeric material has silica or copper carbonate added to keep from being runny and to provide stiffness
Condensation silicone
38
Out of elastomeric materials which one has the lowest dimensional change
Addition silicone
39
Which elastomeric material is expensive
Addition silicone
40
Which elastomeric materials are two paste system
Condensation | Addition
41
Which elastomer is more hydrophilic and stiff then the other ones
Polyether
42
Which elastomer can be difficult to remove from the mouth
Polyether
43
Which is easier to mix silicone material or polysulfide
Silicone material
44
Which was developed as an alternative to polysulfide
Condensation silicone
45
Does polyether have a shorter working and setting time compared with other elastomeric materials
Yes
46
What are 3 types of pattern waxes
Inlay casting baseplate
47
Why would casting wax be used
Used for the construction of metal framework of partial and complete dentures
48
Are casting wax softened in the oral cavity
No
49
Produces patterns for metal casting
Inlay wax
50
Used to produce the form on which denture teeth are set
Baseplate wax
51
What are classifications of processing waxes
Boxing utility sticky
52
Used to form the base portion of a gypsum model
Boxing wax
53
Which wax is slightly tacky at room temperature
Boxing wax so it can adhere to each other
54
Other name for utility wax
Periphery wax or rope wax
55
What wax could you use to cover sharp brackets and wires for orthodontic clients
Utility wax
56
Used for wax bite registrations
Utility wax
57
Wax that is hard and brittle at room temperature
Sticky wax
58
Used to adhere components of metal, gypsum or resin temporarily during fabrication an repair
Sticky wax
59
Two types of impression waxes
Corrective impression, bite registration
60
"It cut teeth like so much acid"
1866 ADA committee prepared statement
61
What is under class 1 FDA
Gloves Prophet paste OTC products
62
What is under class 2
Amalgam restoration | Composite restoration
63
What is class 3
Implants | Bone grafting material
64
What are two international agency standard
ISO | fDI
65
How is gypsum produced
Dihydrate of calcium sulfate then heated which loses water then founded into powder hemihydrate
66
What is an exothermic reaction
When the by-product in a chemical reaction is heat
67
Diagnostic casts are you usually of
Dental plaster or stone
68
Working casts
Casts generally made from one of the dental stones that are strong enough to resist the stresses of fabricating an indirect restoration or prosthesis
69
Why use dental stone for working casts
Because they require good strength and accuracy
70
What are the five gypsum products
``` Impression plaster Model plaster Dental stone Dental stone high strength Dental stone high strength and expansion ```
71
Porous irregular particles
Model plaster type 2
72
Used to secure casts to the articulation or preliminary casts
Model plaster
73
Uniformed in shape less porous
Dental stone
74
Stronger and more expensive than plaster
Dental stone
75
Ideal for making casts for complete and partial denture and orthodontic models
Dental stone
76
High strength (5)
Material is very dense Die stone Produced by calcining the gypsum in a 30% calcium chloride solution with increased pressure and powder grinding Used for making casts or does for inlay and crowns
77
Most costly of gypsum products and recently added to the list of ADA gypsum products. Needed for higher strength and high expansion
Expansion (5)
78
Tensile force
Force applied in opposite directions to stretch an object
79
Shearing force
Force applied when two surfaces slide against each other
80
A twisting force that combined tensile and compressive force
Torsion or torque
81
Stress
The internal force wich resists the applied force

Dental Materials (3 decks)

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