Dental Materials Flashcards
(112 cards)
0
Q
Max setting xpansion of densite?
A
0.1%
1
Q
Density of amalgam?
A
11.6gm/cm cube
2
Q
1 hr compressibe strength of class2 stone?
A
34.5 mpa
3
Q
Temp at which gypsum converted to caso4.1/2h2o
A
110-130 degree
4
Q
Ada no gypsum products
A
25
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%
6
Q
W/p ratio fr type 4 gypsum
A
0.22-0.24
7
Q
Amalgam ada no
A
1
8
Q
Zn content in zn containing amalgam
A
0.01%
9
Q
Water of reaction
A
18.6 ml
10
Q
Particle size of mordern amalgam alloy
A
15-45micron meter
11
Q
K2so4 : borax in gypsum
A
10:1
12
Q
Dry surface hardness of type 4 gypsum
A
92 RHN
13
Q
Temp at which inlay wax is softened
A
54-60 degree
14
Q
Ada fr dental inlay casting wax
A
4
15
Q
Minimum comp strength of amalgam after one hour
A
80 mpa
16
Q
Threshold fr mercury exposure
A
0.05mg/m cube
17
Q
Ada no modellin or base plate wax
A
24
18
Q
Compressive stregth of low cu spherical
Admixed
Unicomposiional
A
366 mpa
431 mpa
510 mpa
19
Q
Creep of low cu
A
0.8-8% or less than 2 %
20
Q
Hg amount in spherical alloy
A
42%
21
Q
Amalgam strength for 24 hrs after setting
A
300 mpa
22
Q
% of non volatile residue permitted in hg
A
Less than 0.01%
23
Q
Delayed expansion of amalgam is see. Upto
A
400 micro meter
24
Dimensional change of gamma one phase btwn 5 to 25 mins
-15 to + 20 micrometer/cm
25
Temp tht shouldnt exceed during burnishing of amalgam
60 degree
26
% of unconsumed alloy in cu amalgam
27%
27
One pound
453.59 gm
28
Temp raise for linear coet
1 kelvin
29
Microfilled KHN
25-35 KHN
30
Water sorption for traditional all purpose hybrid composite
0.5-0.7 mg/cm square
31
Melting
| Point of silver
960 degree C
32
KHM for amalgam
Dentin
Enamel
90
68
343
33
Gold alloy contraction
1.4%
34
Linear COET of metal in metal ceramic
13.5-14.5x 10 to the power -6 / degree centigrade
35
Ada no Endo files
28
36
Comp strength enamel
| Dentin
384 mpa
| 297 mpa
37
KNoop hardness applies load of maximum
35 N
38
Sprue former attached at an angle of what to procimal
| Side
45 degree
39
Thickness of ring liner
1 mm
40
Gamma 1 phase is dissolved hw much in tin
1-3%
41
Type 4 alloy yield strength
Greater than340
42
Gold atomic no
79
43
Avg particle size of tradtiinal comp
8 - 12 micro meter
44
Low heat technique gypsum mould heated upto
500degree C
45
Acetylene flame temp
| Propane
3140
| 2860
46
Linear shrinkage of type 4 alloy
2.3%
47
Polymer : monomer
3:1
48
Benzoyl perpxide releases free radicals at or above
60 degree
49
Ada no denture base resin
12
50
Volumetric shrinkage when methly methacrylate is polymerised
21%
51
Electrode potential of 0
Hydrogen
52
Min and mac hygroscopic expansion for type 2 investment
1.2-2.2%
53
Setting time of dental casting investment
5-25 mins
54
Temp beyond which gypsum investment shud not b heated
700 degree C or 1292 degree F
55
Highest burnout for phosphate investment
1030degree c
56
Monomer bpiling point
100.8 degreeC
57
High cu admixed ag cu eutectic alloy : low cu lathe cut
1:2
58
% pf gamma one phase in well
| Condensed low cu amalg
54%
59
First seal of ada acceptance
1931
60
Contact angle of hydrophilic addition silicone with water
30-35 devree.
61
Temper toming of agar
3-10 mins
62
Mean working time
| Of polysulfide at 37 degree C
4.3 mins
63
Ph of polyF
1.7
64
Potassium sulfate ( gypsum hardner ) % comp
1-2%
65
Avg particle size of powdered gold
15 microM
66
Meltig point of gold
1063 degree C or 1945 degree F
67
Comp strength of silicate cement
180 mpa
68
Max flow of type one imp comp at 45 degree C
80%
69
A id comtent of liquid phosphate cement
33+ or - 5%
70
```
Storage of agar
Tempering
Max tolerable temp
Liquefaction temp
Fusion
```
```
65
45
55
70-100
37-50 degree C
```
71
Conc of flouride in immediate vicinity of gic
5 ppm or more
72
Max film thickness got bonding application
25 microM
73
Max solubility in water for bomding applications
0.2%
74
Mohs hardness for talc
1
75
Calcining gypsum in cacl2 solution in conc of
30%
76
Shrinkage of zoe imp paste during hardening
Less than0.1%
77
Introduction of powered tooth brushes
1939
78
Water temp for agar cooling
Less than 18-21 degree C
79
Znpo4 string length
12-19 mm
80
```
COET for detin
Titanoum
Amalgam
Type 2 gic
Inlay wax
Enamel
```
8.3
8.5
25
11
400
11.4
81
Gold foil density
15.9gm/ cm cube
82
% of ca in gold ca allpy
0.1%
83
Hydration reaction of MTA CONTINUES UPTO
28 days
84
Elastic modulus of enamel
84gpa
85
Mercury vapour pressure
20mg/meter cube
86
W/p ration of dental stone and plaster
0.28 and 0.6
87
Amalgam achieves 70% of its strength in
8 hrs
88
Max thickness of lutong cement shud not b more than
25 micro meter
89
Once triturated analgam should b condensed in
3 mins
90
Half life of hg inhuman body
55 days
91
Mixing time of gypsum by hand spatulation
1 min
92
Nitinol elastic modulus
40 gpa
93
Tensile strength of znpo4
5.5 mpa
94
Knoop hardness employs load of less than
9.8N
95
Half life of monomer
20-40 mins
96
24k gold is same as
1000 fine
97
One grain gold is
0.0645 gm
98
Percen of thixotropic material in agar
0.3-0.5%
99
Minimum thiclness of gel btwn tray and alginate
3mm
100
Minimum flow of type one inlay casting wax at 45 degree
70%
101
Macimum allowable creep for amalgam
3%
102
By how much temp tje flow temp should be lower than Solidus temp of metals to be joined
55.6 degree C or 100 degree F
103
Fusing temp
Ultralow less than 850
Low 850-1100
Medium1101-1300
High 1300 degree C
104
% of chromium added to make steel as stainless steel
12-30%
105
In yttria stabilized zirconia yttrium oxide is present in
3 mol% av 3-5 mol%
106
Vol of tetrasilisic flourmica in docor
55% by vol
107
Temp at which sensotization occurs mpst rapidly
650 degree c
108
Pearlite formed at temp of
723 degree c
109
Elatic modulus of stainless steel ortho wire
179 gpa
110
Plain carbon steel contains carbon less than
2.1%
111
Soldering temp for silver solders for stainless steel
620-665 degree c
