Biomaterials > specific questions > Flashcards

specific questions Flashcards

(35 cards)

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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

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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

Study These Flashcards
A

24 = 100 finess

18 = 750 finess

12 = 500 (50%)

18
Q

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

Study These Flashcards
A

Hydroxyapetie

19
Q

what are examples of NOT complete ceramic?

Study These Flashcards
A
  1. resin composite

2. glass ionomer

20
Q

phases of porcelain

Study These Flashcards
A
  1. crystal

2. glass

21
Q

list noble metals

Study These Flashcards
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

23
Q

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

Study These Flashcards
A

OXIDE THE METAL

24
Q

bonding to dentin was a problem for years because?

Study These Flashcards
A

BISGMA is hydrophobic and dentin contains water

25
why HA for coating?
1. biocompatible 2. increases compressive strength 3. effects on contact osteogenesis
26
interpenetrating phase material often has higher fracture toughness values than conventionoal feldspathic porcelain because
1. phases are continues | 2. the phases are bonded to eachother
27
advantages of dental CAD/CAM systems?
1. single visit | 2. bridge crown inlay and onlay can be fabricated
28
galvanic corroson may occur when two different alloys are connected electrically ?
YES -- like when have gold next to an amalagam
29
why choose base metal alloy rather than precious for large cast resorations
1. less expensive | 2. higher modulus (stiffer)
30
Full contour monolithic zirconia should always be?
POLISHED is answer b. glazed c. left as machined Ideal is polish and glazed if you cannot glaze should at least polish
31
grain refining metals
In and Ru
32
solid solution of Cu-Au
Solid solution: >424 C, Random arrangement of atoms in space Material is more malleable and easier to manipulate
33
more defined solution of Cu-Au called?
intermetallic compound
34
14. What is Noble Metal-Ceramic Alloys?
In Ru added for improved oxide layer Pd and Pt for mechanical properties - alter the thermal expansion coefficient and increase the melting range
35
What is Ca/P ratio in HA? crystalline phases of HA?
1.6 | 50-60%
Biomaterials
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