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Biomaterials > specific questions > Flashcards

specific questions Flashcards

1
Q

exothermal reaction property change in polymerization

A

temperature increase

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2
Q

light absorption change property change in polymerization

A

low translucent

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3
Q

volume shrinkage property change in polymerization

A

shrinkage stress

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4
Q

viscosity increases property change in polymerization

A

determines working time

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5
Q

modulus increases?property change in polymerization

A

hardness and strenght increase

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6
Q

Cr-Co based metal alloy used for metal ceramic resotration but then peels off.. why?

A

oxide layer too thick

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7
Q

stainless steel ortho wires can be strenghened how

A

heat treating

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8
Q

co-olymers are characterized by

A

more than one type of monomer

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9
Q

T/F authentic stainless steel has nickel

A

true

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10
Q

what is considered an interpenetrating proof material?

A

In-ceram

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11
Q

dental acrylic monomers are polymerized by? by - prodcuts?

A

OPENING up the double bonds

  • NO BY -PRODUCTS
  • (case for resins, acrylic, and dental composite)
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12
Q

all ceramic material must be sintered to become stronger?

A

FALSE

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13
Q

name single phase materials and multi phase

A

single

  • acrylic resin
  • saline bonding agent

multi

  • porcelain
  • in- ceram
  • amalgam
  • composite resin
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14
Q

three important factors for determining physical properties of metals (like strength, ductile, etc)

A
  1. crystal structure
  2. phase composition
  3. Grain size
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15
Q

which have nickel which dont?

A

Ticonium - alot

not - vitalium or noblium

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16
Q

pressable material like Empress 2 ceramic has imporved mechanical properties primarily because

A
  1. HIGHER LUCITE CRYSTAL CONTENT than conventional porcelain
  2. SMALLER LUCITE CRYSTAL SIZE than conventional porcelain
17
Q

12 carat vs 18 vs 24

A

24 = 100 finess

18 = 750 finess

12 = 500 (50%)

18
Q

most common used calcium phosphate ceramic as a dentla coating material is?

A

Hydroxyapetie

19
Q

what are examples of NOT complete ceramic?

A
  1. resin composite

2. glass ionomer

20
Q

phases of porcelain

A
  1. crystal

2. glass

21
Q

list noble metals

A
  1. Au
  2. Pd
  3. Pt
  4. In
  5. Ru
  6. Rh
  7. Os

NOT Co or Ag

22
Q

porcelain for PFM restoration is composed primarily of

A

FELDSPAR

23
Q

PFM restoration usually requires a heat-treatment of the milled ‘core’ before applying porcelain. Purpose?

A

OXIDE THE METAL

24
Q

bonding to dentin was a problem for years because?

A

BISGMA is hydrophobic and dentin contains water

25
Q

why HA for coating?

A
  1. biocompatible
  2. increases compressive strength
  3. effects on contact osteogenesis
26
Q

interpenetrating phase material often has higher fracture toughness values than conventionoal feldspathic porcelain because

A
  1. phases are continues

2. the phases are bonded to eachother

27
Q

advantages of dental CAD/CAM systems?

A
  1. single visit

2. bridge crown inlay and onlay can be fabricated

28
Q

galvanic corroson may occur when two different alloys are connected electrically ?

A

YES – like when have gold next to an amalagam

29
Q

why choose base metal alloy rather than precious for large cast resorations

A
  1. less expensive

2. higher modulus (stiffer)

30
Q

Full contour monolithic zirconia should always be?

A

POLISHED is answer
b. glazed
c. left as machined
Ideal is polish and glazed if you cannot glaze should at least polish

31
Q

grain refining metals

A

In and Ru

32
Q

solid solution of Cu-Au

A

Solid solution: >424 C, Random arrangement of atoms in space
Material is more malleable and easier to manipulate

33
Q

more defined solution of Cu-Au called?

A

intermetallic compound

34
Q
  1. What is Noble Metal-Ceramic Alloys?
A

In Ru added for improved oxide layer

Pd and Pt for mechanical properties
- alter the thermal expansion coefficient and increase the melting range

35
Q

What is Ca/P ratio in HA? crystalline phases of HA?

A

1.6

50-60%

Biomaterials (16 decks)

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