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Entrance > Dental Materials > Flashcards

Dental Materials Flashcards

0
Q

Max setting xpansion of densite?

A

0.1%

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1
Q

Density of amalgam?

A

11.6gm/cm cube

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2
Q

1 hr compressibe strength of class2 stone?

A

34.5 mpa

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3
Q

Temp at which gypsum converted to caso4.1/2h2o

A

110-130 degree

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4
Q

Ada no gypsum products

A

25

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5
Q

Ready to use criteria fr gypsum products is wen compressive strength is atleast hw much of what it wil b in an hour

A

80%

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6
Q

W/p ratio fr type 4 gypsum

A

0.22-0.24

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7
Q

Amalgam ada no

A

1

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8
Q

Zn content in zn containing amalgam

A

0.01%

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9
Q

Water of reaction

A

18.6 ml

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10
Q

Particle size of mordern amalgam alloy

A

15-45micron meter

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11
Q

K2so4 : borax in gypsum

A

10:1

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12
Q

Dry surface hardness of type 4 gypsum

A

92 RHN

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13
Q

Temp at which inlay wax is softened

A

54-60 degree

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14
Q

Ada fr dental inlay casting wax

A

4

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15
Q

Minimum comp strength of amalgam after one hour

A

80 mpa

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16
Q

Threshold fr mercury exposure

A

0.05mg/m cube

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17
Q

Ada no modellin or base plate wax

A

24

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18
Q

Compressive stregth of low cu spherical
Admixed
Unicomposiional

A

366 mpa
431 mpa
510 mpa

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19
Q

Creep of low cu

A

0.8-8% or less than 2 %

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20
Q

Hg amount in spherical alloy

A

42%

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21
Q

Amalgam strength for 24 hrs after setting

A

300 mpa

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22
Q

% of non volatile residue permitted in hg

A

Less than 0.01%

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23
Q

Delayed expansion of amalgam is see. Upto

A

400 micro meter

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24
Q

Dimensional change of gamma one phase btwn 5 to 25 mins

A

-15 to + 20 micrometer/cm

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25
Q

Temp tht shouldnt exceed during burnishing of amalgam

A

60 degree

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26
Q

% of unconsumed alloy in cu amalgam

A

27%

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27
Q

One pound

A

453.59 gm

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28
Q

Temp raise for linear coet

A

1 kelvin

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29
Q

Microfilled KHN

A

25-35 KHN

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30
Q

Water sorption for traditional all purpose hybrid composite

A

0.5-0.7 mg/cm square

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31
Q

Melting

Point of silver

A

960 degree C

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32
Q

KHM for amalgam
Dentin
Enamel

A

90
68
343

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33
Q

Gold alloy contraction

A

1.4%

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34
Q

Linear COET of metal in metal ceramic

A

13.5-14.5x 10 to the power -6 / degree centigrade

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35
Q

Ada no Endo files

A

28

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36
Q

Comp strength enamel

Dentin

A

384 mpa

297 mpa

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37
Q

KNoop hardness applies load of maximum

A

35 N

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38
Q

Sprue former attached at an angle of what to procimal

Side

A

45 degree

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39
Q

Thickness of ring liner

A

1 mm

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40
Q

Gamma 1 phase is dissolved hw much in tin

A

1-3%

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41
Q

Type 4 alloy yield strength

A

Greater than340

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42
Q

Gold atomic no

A

79

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43
Q

Avg particle size of tradtiinal comp

A

8 - 12 micro meter

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44
Q

Low heat technique gypsum mould heated upto

A

500degree C

45
Q

Acetylene flame temp

Propane

A

3140

2860

46
Q

Linear shrinkage of type 4 alloy

A

2.3%

47
Q

Polymer : monomer

A

3:1

48
Q

Benzoyl perpxide releases free radicals at or above

A

60 degree

49
Q

Ada no denture base resin

A

12

50
Q

Volumetric shrinkage when methly methacrylate is polymerised

A

21%

51
Q

Electrode potential of 0

A

Hydrogen

52
Q

Min and mac hygroscopic expansion for type 2 investment

A

1.2-2.2%

53
Q

Setting time of dental casting investment

A

5-25 mins

54
Q

Temp beyond which gypsum investment shud not b heated

A

700 degree C or 1292 degree F

55
Q

Highest burnout for phosphate investment

A

1030degree c

56
Q

Monomer bpiling point

A

100.8 degreeC

57
Q

High cu admixed ag cu eutectic alloy : low cu lathe cut

A

1:2

58
Q

% pf gamma one phase in well

Condensed low cu amalg

A

54%

59
Q

First seal of ada acceptance

A

1931

60
Q

Contact angle of hydrophilic addition silicone with water

A

30-35 devree.

61
Q

Temper toming of agar

A

3-10 mins

62
Q

Mean working time

Of polysulfide at 37 degree C

A

4.3 mins

63
Q

Ph of polyF

A

1.7

64
Q

Potassium sulfate ( gypsum hardner ) % comp

A

1-2%

65
Q

Avg particle size of powdered gold

A

15 microM

66
Q

Meltig point of gold

A

1063 degree C or 1945 degree F

67
Q

Comp strength of silicate cement

A

180 mpa

68
Q

Max flow of type one imp comp at 45 degree C

A

80%

69
Q

A id comtent of liquid phosphate cement

A

33+ or - 5%

70
Q 
Storage of agar
Tempering
Max tolerable temp
Liquefaction temp
Fusion
A 
65
45
55
70-100
37-50 degree C
71
Q

Conc of flouride in immediate vicinity of gic

A

5 ppm or more

72
Q

Max film thickness got bonding application

A

25 microM

73
Q

Max solubility in water for bomding applications

A

0.2%

74
Q

Mohs hardness for talc

A

1

75
Q

Calcining gypsum in cacl2 solution in conc of

A

30%

76
Q

Shrinkage of zoe imp paste during hardening

A

Less than0.1%

77
Q

Introduction of powered tooth brushes

A

1939

78
Q

Water temp for agar cooling

A

Less than 18-21 degree C

79
Q

Znpo4 string length

A

12-19 mm

80
Q 
COET for detin
Titanoum
Amalgam
Type 2 gic
Inlay wax
Enamel
A

8.3
8.5
25
11
400
11.4

81
Q

Gold foil density

A

15.9gm/ cm cube

82
Q

% of ca in gold ca allpy

A

0.1%

83
Q

Hydration reaction of MTA CONTINUES UPTO

A

28 days

84
Q

Elastic modulus of enamel

A

84gpa

85
Q

Mercury vapour pressure

A

20mg/meter cube

86
Q

W/p ration of dental stone and plaster

A

0.28 and 0.6

87
Q

Amalgam achieves 70% of its strength in

A

8 hrs

88
Q

Max thickness of lutong cement shud not b more than

A

25 micro meter

89
Q

Once triturated analgam should b condensed in

A

3 mins

90
Q

Half life of hg inhuman body

A

55 days

91
Q

Mixing time of gypsum by hand spatulation

A

1 min

92
Q

Nitinol elastic modulus

A

40 gpa

93
Q

Tensile strength of znpo4

A

5.5 mpa

94
Q

Knoop hardness employs load of less than

A

9.8N

95
Q

Half life of monomer

A

20-40 mins

96
Q

24k gold is same as

A

1000 fine

97
Q

One grain gold is

A

0.0645 gm

98
Q

Percen of thixotropic material in agar

A

0.3-0.5%

99
Q

Minimum thiclness of gel btwn tray and alginate

A

3mm

100
Q

Minimum flow of type one inlay casting wax at 45 degree

A

70%

101
Q

Macimum allowable creep for amalgam

A

3%

102
Q

By how much temp tje flow temp should be lower than Solidus temp of metals to be joined

A

55.6 degree C or 100 degree F

103
Q

Fusing temp

A

Ultralow less than 850
Low 850-1100
Medium1101-1300
High 1300 degree C

104
Q

% of chromium added to make steel as stainless steel

A

12-30%

105
Q

In yttria stabilized zirconia yttrium oxide is present in

A

3 mol% av 3-5 mol%

106
Q

Vol of tetrasilisic flourmica in docor

A

55% by vol

107
Q

Temp at which sensotization occurs mpst rapidly

A

650 degree c

108
Q

Pearlite formed at temp of

A

723 degree c

109
Q

Elatic modulus of stainless steel ortho wire

A

179 gpa

110
Q

Plain carbon steel contains carbon less than

A

2.1%

111
Q

Soldering temp for silver solders for stainless steel

A

620-665 degree c

Entrance (7 decks)

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