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DENTAL MATERIALS REMEDIATION > Intro to Dental materials slides > Flashcards

Intro to Dental materials slides Flashcards

1
Q

Is the stress on the stress-strain curve when it ceases to be linear

A

Proportional Limit

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2
Q

Yield Strength is…

A

Is the stress at some arbitrarily selected value of permanent strain

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3
Q

The Elastic Modulus is…

A

a measure of
the stiffness of a material The Elastic Modulus is the slope of the stress-strain curve in the initial
straight-line portion

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4
Q

Ultimate Strength is…

A

the stress at which the fracture occurs.

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5
Q

Denture base should be constructed from a rigid material for two reasons:

A
  1. Load distribution

2. To be used in thin sections without bending

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6
Q

The Yield strength of human enamel is…

A

344 Mpa

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7
Q

The Yield Strength of composite are…

A

138-172 Mpa

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8
Q

Average of biting forces: For molars***

A

580 N

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9
Q

Average of biting forces: Bicuspids ***

A

310 N

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10
Q

Average of biting forces: Cuspids***

A

220 N

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11
Q

Average of biting forces: Incisors***

A

180 N

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12
Q

Patients with restorations and prosthesis decreases the biting forces by**

A

50-80%

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13
Q

Stress is…

A

is the internal action to the external applied force

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14
Q

Stress =

A

=Force/Area

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15
Q

For a given force, the_______ the area over which is applied, the______ the value of the stress

A

smaller

larger

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16
Q

Strain is…

A

Is the change in length per unit length of a material produced by stress.

Strain = Deformation/Length

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17
Q

elastic strain is…

A

Temporary

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18
Q

Plastic strain is…

A

Permanent

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19
Q

Ultimate compressive strength for human enamel?

A

400 MPa

20
Q

Ultimate Tensile strength for gold alloys?

A

414-828 MPa

21
Q

Ultimate tensile strength for nickel-chromium alloy?

A

421 MPa

22
Q

Elongation and Compression is?

A 
The amount of deformation that a
material can resist before rupture
and is reported as the percent of
elongation when the material is
under tensile stress or the percent
of compression when it is under
compressive stress.
23
Q

The percent of elongation and compression are measures of

A

ductility and malleability, respectively.

24
Q

Percent of Elongation—>

A

Ductility

25
Q

Percent of Compression—>

A

Malleability

26
Q

indicate the brittleness of the material.

A

Ductility, and Malleability

27
Q

In general, alloys with elongation less than 5% are considered

A

brittle

28
Q

Alloys with elongation higher than 5% are considered

A

ductile

29
Q

 Toughness:*****

A

Energy necessary to fracture a material

30
Q

 Resilience:*****

A

Energy required to deform a material permanently

31
Q

The resilience has a particular importance in the evaluation of:

A
  1. Orthodontic wires, for the expected amount of work from a spring to move a tooth.
  2. Acrylic denture teeth: they are more resilient than porcelain so, they absorb most of the masticatory forces & transmit less force to the ridge
32
Q

The hardness of dental materials is

reported in…

A

Knoop hardness

33
Q

A material is considered hard if it

A

strongly resists indentation by a

hard material such as diamond.

34
Q

Galvanism Results from the

A

presence of dissimilar metals in the mouth

35
Q

is a measure of the body’s response to an

specific material.

A

Biocompatibility

36
Q

The linear thermal expansion is expressed as a

A

coefficient of

thermal expansion

37
Q

coefficient of thermal expansion for Wax

A

300-1000

38
Q

coefficient of thermal expansion for Human teeth

A

10-15

39
Q

coefficient of thermal expansion for Composites

A

25-68

40
Q

coefficient of thermal expansion for Gold alloy

A

12-15

41
Q

coefficient of thermal expansion for Amalgam

A

22-28

42
Q

coefficient of thermal expansion for Porcelain

A

8

43
Q

Thermal conductivity of Dental amalgam

A

0.055

44
Q

Thermal conductivity of Gold alloys

A

0.710

45
Q

is a measure of
the affinity of a liquid for a
solid as indicated by
spreading of a drop.

A

Wettability

DENTAL MATERIALS REMEDIATION (7 decks)

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