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Biomaterials > Test 4 > Flashcards

Test 4 Flashcards

1
Q

Au, Ag, Cu, Pd, Pt, Ni are soft and ductile and form what kind of crystal

A

face centered cubic

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2
Q

Co, Cr, Fe, are less ductile and stronger and form what kind of lattice

A

body centered cubic

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3
Q

Ti is very strong and tightly packed into which lattice

A

hexagonal close packed

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4
Q

what kind of grain crystal structure is ideal

A

small grain structure

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5
Q

smaller grains brings about more of what

A

grain boundaries

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6
Q

Common form of alloys is a

A

solid solution

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7
Q

Mixture of elements at the atomic level, and is similar to a mixture of liquids that are soluble in one another is called a

A

solid solution

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8
Q

The solvent atoms are replaced by the atoms of the solute in which solid solution

A

substitution solid solution

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9
Q

The solute atoms take up the space between the solvent atoms in which solid solution

A

intersititual solid solution

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10
Q

All of the following are criteria for what solid solution?

  • The atoms must have the same valency
  • The atoms must have the same crystal structure (e.g. BCC)
  • The atomic sizes are within 15% of each other
A

Substitution solid solution

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11
Q

All of the following are criteria for what solid solution?
-The atoms must have similar crystal
structure
-The atomic size of the solute is less than 60% of the solvent

A

interstitual solid solution

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12
Q

Ag3Sn is what dental alloy

A

dental amalgam

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13
Q

what is an example of interstitual solid solution

A

stainless steel

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14
Q

what is an example of substitution solid solution

A

casting alloys

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15
Q

what kind of alloy is Worked by being forged or hammered

A

wrought alloy

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16
Q

what kind of alloy is Molten alloy is poured into a mold to give it its shape, and has very little strength

A

casting alloy

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17
Q

which alloy is stronger as it has been worked, pounded into shape.

A

wrought alloy

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18
Q

inlays, onlays, RPD, crowns all use what kind of alloy

A

casting alloy

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19
Q

orthodontic wires and endodontic instruments are usually made from what kind of alloy

A

wrought alloy

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20
Q

Resistant to Oxidation and Disolution is considered what classification of alloys

A

noble alloys

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21
Q

Readily oxidize or dissolve to release ions is considered what kind of classification of alloys

A

base metal alloy

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22
Q

base metal and noble alloys are subgroups to what greater classification

A

composition

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23
Q

Inlays- Non stress-bearing areas is which type of alloy property (soft)

A

type 1

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24
Q

Inlays/Onlays in stress-bearing areas is which type of alloy property (medium)

A

type 2

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25
full crowns, 3⁄4 crowns, and short- span fixed partial dentures is which type of alloy property (hard)
type 3
26
full crowns, long -span fixed partial dentures, and removable partial dentures is which type of alloy property (extra hard)
type 4
27
what is the noble content for high noble alloys
greater than 60% noble content
28
what is the noble content for noble alloys
greater than 25% noble content
29
what is the noble content for base metal alloys
less than 25% noble content
30
Au, Pd, Pt and Cu are considered to make up what kinds of alloys (all have some gold in it)
high noble alloys
31
Pd, Ag, Au, Cu, Ga are considered to make up what kinds of alloys (dont need to have gold)
noble alloys
32
Ni, Cr, Co make up what kind of alloy
base metal alloy
33
which metal provides an alloy with Tarnish and Resistance, Malleability, Ductility
Au (gold)
34
which metal provides hardness to an alloy
Cu (copper)
35
which metal Modifies, is a Color Controller and Reduces Melting Point
Ag (silver)
36
which metal is a Scavenger- Oxidation prevention
Zn (Zinc)
37
which metal Increases Strength + Tarnish resistance
Pt (platinum)
38
which metal Absorbs H2
Pd (Paladium)
39
which two metals are grain refiners
Ir, Ru (iridium and Ruthenium)
40
which clinical alloy has a high amount gold, silver and copper, high noble type 4 and is used for full metal coverage
Neyoro 60
41
Most Metallic Alloys form and exist as: a) InterMetallic Compounds b) Solid Solutions c) Non equilibrium solutions
solid solution
42
According to the classification based on properties, choose the strongest alloy a) Type 1 b) Type 2 c) Type 3 d) Type 4
type 4
43
``` High Noble Alloys contain which of the following: a) Greater than 60 % Noble elements b) Greater than 25 % Noble elements but less than 60% c) Less than 60 % Noble elements ```
greater than 60% noble elements
44
which clinical alloy is a high noble type 4 high in gold and paladium and is used for full metal and porcelain fused metals
Eclipse
45
which clinical alloy is a high noble type 4, high amount of paladium and used in metal and porcelain fused metals
Option
46
which clinical alloy uses base metals
Odyssey
47
product in dentistry made of calcium sulfate
gypsum
48
what is the gypsum form without water
calcium sulfate hemihydrate
49
what is the gypsum form with water
calcium sulfate dihydrate
50
what kind of reaction is the reaction to form gypsum
exothermic
51
how many types of dental gypsums are there and what ADA spec regulates it
there are 5 gypsums and spec #25
52
when you add water to gypsum what does it give off
heat
53
what is the most widely used dental gypsum
Type 3
54
what type of gypsum is used to make wax patter and is much harder
type 4
55
which type of gypsum is described as high strength, low expansion
type 4
56
which type of gypsum is described as high strength high expansion
type 5
57
gypsum has what type of expansion and what type of contraction
linear expansion and volumetric contraction
58
Heating under ambient pressure in open vessel (calcining) produces
plaster
59
Heating under increased pressure and steam produces
dental stone
60
Heating under increased pressure and steam with CaCl2 produces
improved die stone
61
how is setting time determined
using a needle and poking it causing penetration
62
what is the watery slurry after trimming a cast
terra alba
63
what is terra alba good for
accelerating setting time
64
heat and humidity do what to the setting time
accelerates
65
sodium citrate and sodium phosphate act as what for controlling a setting reaction
retarder, slows setting
66
potassium sulfate and calcium sulfate act as what for controlling a setting reaction
accelerant
67
blood, saliva, colloids (agar and alginate) act as what in a setting reaction
retarder
68
what is The main difference between unreacted plaster and dental stone
density of the crystals
69
describe the water to powder ratio in plaster, dental stone and die stone
lost of water in plaster and less water in dental stone and even less in die stone
70
Soaking a cast in water will lead to what for the cast
softening of the cast
71
what lessens solubility and minimizes dissolution of the cast surface after the cast is completed
soaking it in the slurry water
72
what is common dental stone called in clinic
hydrocal
73
what is common die stone used in clinic
densite
74
``` The incisal edges of the teeth in a dental model made with Hydrocal are chalky and friable. Speculated best cause is? a) saliva left in impression b) prolonged contact with alginate c) too much spatulation d) too little water in mix  ```
too much spatulation
75
Adding sodium citrate accelerates setting time. Increased humidity prolongs setting time. T/F
both false
76
The type of gypsum product described as high strength and low expansion is?
Type 4
77
what effects the size of the crystals in metal solidification
rate of cooling
78
if you cool a solid solution slowly what kind of crystals do you get, small or large
large
79
terra alba is made up of what two compounds
calcium sulfate and water
80
why is Changing the W/P not a good means of changing the setting time
because tensile and compressive strength will decrease
81
Increasing the spatulation speed will do what to setting time
decrease setting time
82
what does NaCl increase and what does it decrease
increases expansion decreases setting time

Biomaterials (4 decks)

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