dental materials ch 43 Flashcards

1
Q

restorative

A

ability to replace or bring something back to its natural appearance and function. (chipped tooth)

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2
Q

esthetic

A

restoring to an artistically pleasing appearance

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3
Q

infection control

A

not to cross-contaminate, use over gloves, tissues, paper towel, cotton pliers, etc.. when handling containers/materials

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4
Q

biting forces

A

average biting/chewing with natural dentition= 130-170 lbs molar, 40lbs incisors.
Around 28,000 lbs of pressure per square inch on a single cusp of a molar

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5
Q

tensile stress

A

pulls and stretches the material

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6
Q

compressive stress

A

pushes the material together

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7
Q

shear stress

A

the breakdown of the material as a result of something sliding over the two areas

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8
Q

the measure of the capacity of a metal to be stretched or drawn by a tensile force without fracture

A

ductility

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9
Q

the measure of the capacity of a metal to be extended in all directions by a compressive force

A

malleability

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10
Q

thermal change

A

causes contraction and expansion, need to protect the pulp from thermal shock

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11
Q

microleakage

A

space between tooth structure and the restoration in which fluid debris and microorganisms could enter

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12
Q

how is an electrical current or galvanic action created

A

when two different metals are present in the oral cavity

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13
Q

corrosive properties

A

reaction within a metal when it comes into contact with corrosive factors (temp, humidity, saline)

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14
Q

most corrosion is

A

only surface discoloration (tarnish)

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15
Q

solubility

A

a substance dissolving in another substance

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16
Q

flow

A

a product going inside the tooth and how it flows inside

17
Q

adhesion

A

to bond or attach two items together

18
Q

what affects adhesion

A

wetting, viscosity, surface characteristics, and film thickness

19
Q

wetting

A

the ability of a liquid to flow over the surface & into small irregularities

20
Q

viscosity

A

property of a liquid that causes it not to flow easily

21
Q

t/f; a liquid flows more easily on a rough surface than on a very smooth surface and will influence the wetting ability

A

true

22
Q

film thickness

A

the thinner the film the stronger the adhesive junction

23
Q

retention

A

ability to hold two things firmly together when they will not adhere to each other naturally

24
Q

curing

A

setting material into a hardened, permanent state

25
Q

auto-cured material

A

hardens as a result of a chemical reaction of the materials being mixed together.
must be mixed and placed when you need to use it

26
Q

light-cured material

A

does not harden, until it has been exposed to a curing light.

27
Q

how does an auto-cured material harden or set

A

by chemical reaction

28
Q

what is used to triturate capsulated dental materials

A

amalgamator