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Operative Midterm 2 > Intro to Biomaterials > Flashcards

Intro to Biomaterials Flashcards

1
Q

What are two synthetic biomaterials?

A

Composites and silicone impression materials

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2
Q

What are two natural biomaterials?

A

Alginates and hydrocolloids

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3
Q

What are three characteristics of dental metals?

A

Hard, Ductile (tough), and strong

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4
Q

What are three characteristics of dental ceramics?

A

Hard, brittle, and strong

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5
Q

What are three characteristics of dental polymers?

A

Soft, ductile (tough), weak

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6
Q

What is the microstructure (building block) of dental porcelain?

A

SiO4 tetrahedron, primarily a glass with some crystalline residuals

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7
Q

What are the four steps in the polymerization process?

A
  1. Light Activation of Initiator
  2. Initiation of Monomer
  3. Propagation of Free-Radical
  4. Termination of Free-Radical
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8
Q

What are the four stages of chain reaction polymerization?

A
  • Activation
  • Initiation
  • Propagation
  • Termination
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9
Q

What are the two monomer functional groups?

A

Monomethacrylates, and dimethacrylates

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10
Q

What are the characteristics of a chain created from monomethacrylates?

A

Linear chain

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11
Q

What are the characteristics of a chain created from dimethacrylates?

A

Branched and crosslinked

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12
Q

What is the rate of a polymerization reaction?

A

1,000,000 units/sec

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13
Q

What are the four main uses of polymers in dentistry?

A

Provisionals, adhesives, restoratives, and registration materials

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14
Q

Specific gravity is equal to what?

A

Density

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15
Q

Most things ______ when heated and ______ when cooled.

A

Expand

Contract

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16
Q

What are the three dimensions of color?

A

Hue, value, and chroma

17
Q

What are two characteristics of hue?

A

Wavelength and color (roygbiv)

18
Q

What are two characteristics of value?

A

Intensity and brightness

19
Q

What are two characteristics of chroma?

A

Purity and density (concentration)

20
Q

What is metamerism?

A 
Two objects that appear
the same color under
one light source and
different under another
light sourse. They have different spectral characteristics

Operative Midterm 2 (5 decks)

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