Dental Materials - Metallurgy
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- Answered
- Review
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Question 1 of 129
1. Question
All of the following statements about cast cobalt alloy are true EXCEPT:
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Question 2 of 129
2. Question
The contraction of gold alloy on solidifying is approximately:
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Question 3 of 129
3. Question
Addition of large amounts of platinum to a casting gold alloy will
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Question 4 of 129
4. Question
The pattern for the metallic framework of a removable partial denture is fabricated from:
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Question 5 of 129
5. Question
Ideal requirement of metal ceramic casting:
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Question 6 of 129
6. Question
Gap between true end of casting ring and wax pattern should be:
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Question 7 of 129
7. Question
Which of the following is correct:
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Question 8 of 129
8. Question
Which is the use of boxing an impression:
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Question 9 of 129
9. Question
The strength of a gypsum investment is dependent on:
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Question 10 of 129
10. Question
Resistance to corrosion in a cobalt-chrome casting is due to presence of:
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Question 11 of 129
11. Question
The main form of iron carbide found in 18-8 steel:
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Question 12 of 129
12. Question
Flux is used during casting to:
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Question 13 of 129
13. Question
NiTi alloy have
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Question 14 of 129
14. Question
The maximum carbon content of steel used in dentistry is
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Question 15 of 129
15. Question
Pickling:
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Question 16 of 129
16. Question
Wax pattern is ideally invested immediately to decrease the dimensional changes caused by:
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Question 17 of 129
17. Question
Stainless steel orthodontic wire can be hardened by:
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Question 18 of 129
18. Question
The most commonly used Titanium alloy for dental and medical purposes is:
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Question 19 of 129
19. Question
A thinner mix of a gypsum bonded investment will:
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Question 20 of 129
20. Question
Cobalt-Chrominum alloys contains:
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Question 21 of 129
21. Question
Which one of the following is most elastic?
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Question 22 of 129
22. Question
Gypsum bonded investment should not be heated over:
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Question 23 of 129
23. Question
Cleaning of base metal alloy is done by:
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Question 24 of 129
24. Question
Glossy smooth margins of a casting are due to:
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Question 25 of 129
25. Question
Which of the following zones is used for melting alloy during casting:
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Question 26 of 129
26. Question
Incomplete casting is the result of:
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Question 27 of 129
27. Question
Back pressure porosity can be avoided by:
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Question 28 of 129
28. Question
Mouth temperature waxes are:
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Question 29 of 129
29. Question
Setting expansion is advantageous in:
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Question 30 of 129
30. Question
Indium in metal alloys:
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Question 31 of 129
31. Question
Tempering of steel cause
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Question 32 of 129
32. Question
In a patient with allergy to costume jewelry, which of the following is contraindicated:
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Question 33 of 129
33. Question
Which of the following will produce the most rigid restoration for framework of same dimension?
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Question 34 of 129
34. Question
Tublulence of molten gold is due to :
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Question 35 of 129
35. Question
Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is:
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Question 36 of 129
36. Question
A highly polished surface on a metallic dental restoration aids considerably in the prevention of the:
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Question 37 of 129
37. Question
Austenite is an alloy of iron of and carbon with the iron in:
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Question 38 of 129
38. Question
The yield strength of AUstenite (NiTi alloy) is:
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Question 39 of 129
39. Question
Which zone is the hottest and efficient burning zone of the flame used for casting?
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Question 40 of 129
40. Question
Stabilization of stainless steel is achieved by adding:
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Question 41 of 129
41. Question
Localised shrinkage porosity is seen when there:
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Question 42 of 129
42. Question
The function of a sprue is to:
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Question 43 of 129
43. Question
Sub surface porosity can be decreased by:
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Question 44 of 129
44. Question
Softening heat treatment of alloy increases:
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Question 45 of 129
45. Question
The inlay wax most commonly used for direct technique:
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Question 46 of 129
46. Question
Reduction in the fusion temperature of dental gold casting alloys is caused by presence of:
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Question 47 of 129
47. Question
The purity of gold is expressed in:
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Question 48 of 129
48. Question
Function of carnauba wax:
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Question 49 of 129
49. Question
In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to:
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Question 50 of 129
50. Question
The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called:
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Question 51 of 129
51. Question
Investment material used for cobalt-chromium alloys is:
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Question 52 of 129
52. Question
The standard perforated tray for us with alginate impression materials may be brought to more customized contour by:
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Question 53 of 129
53. Question
Silica sol:
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Question 54 of 129
54. Question
The base constituents of dental waxes come from three main sources except:
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Question 55 of 129
55. Question
Boxing wax is also called as:
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Question 56 of 129
56. Question
Stainless steel is used mostly in dentistry:
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Question 57 of 129
57. Question
Shape memory in NiTi is because of stress induced form:
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Question 58 of 129
58. Question
A common electrolyte used for plating copper indirect dies is:
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Question 59 of 129
59. Question
Casting shrinkage is compensated by:
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Question 60 of 129
60. Question
Waxes are used for:
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Question 61 of 129
61. Question
The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5:
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Question 62 of 129
62. Question
Passivating alloys are:
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Question 63 of 129
63. Question
Impurities in casting is removed by:
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Question 64 of 129
64. Question
Which of the following refractory is used to counteract most of the expansion
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Question 65 of 129
65. Question
Shape memory is seen in:
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Question 66 of 129
66. Question
Crucible indicated for casting base metal alloys is:
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Question 67 of 129
67. Question
The best pickling solution for gypsum bonded investment is:
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Question 68 of 129
68. Question
Heat hardening is the process done at:
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Question 69 of 129
69. Question
Corrosion of stainless steel is due to formulation of:
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Question 70 of 129
70. Question
Titanium casting is done:
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Question 71 of 129
71. Question
The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing?
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Question 72 of 129
72. Question
Gold content of an 18 carat alloy is:
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Question 73 of 129
73. Question
Which one of the following categories of dental materials has the highest thermal conductivity>
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Question 74 of 129
74. Question
The sprue in wax pattern should be placed:
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Question 75 of 129
75. Question
Most biocompatible material in oral cavity is:
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Question 76 of 129
76. Question
Quartz in investment material is added for:
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Question 77 of 129
77. Question
Which of the waxes are derived from the lignite:
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Question 78 of 129
78. Question
Inlay wax is used to:
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Question 79 of 129
79. Question
Silver plated dyes use an electrolytic bath of:
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Question 80 of 129
80. Question
18-B Stainless steel orthodontic wire has:
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Question 81 of 129
81. Question
Suck back porosity is due to:
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Question 82 of 129
82. Question
Disadvantage of having a short sprue is:
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Question 83 of 129
83. Question
Air bubbles formed on the surface of casting is probably due to:
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Question 84 of 129
84. Question
Who was the first person to introduce cast inlay restoration into dentistry?
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Question 85 of 129
85. Question
Asbestos liner is used in a casting ring to:
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Question 86 of 129
86. Question
The main ingredient of inlay wax is:
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Question 87 of 129
87. Question
Which of the following decrease with strain hardening
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Question 88 of 129
88. Question
Casting flux is used to:
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Question 89 of 129
89. Question
Suck back porosity in the casting can be eliminated by:
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Question 90 of 129
90. Question
Gases dissolved in molten metals are liberated when cooled giving rise to:
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Question 91 of 129
91. Question
The component in very minor quantity in stainless steel that changes the properties to a maximum level is:
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Question 92 of 129
92. Question
Percentage of gold in high noble alloy is:
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Question 93 of 129
93. Question
Binder used in Gypsum investment is:
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Question 94 of 129
94. Question
Which of the following is function of fluoride flux in soldering process?
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Question 95 of 129
95. Question
Nickel-Titanium alloy has
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Question 96 of 129
96. Question
The deoxidizing agent added to dental alloys is:
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Question 97 of 129
97. Question
Advantage of titanium over other base metal alloys
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Question 98 of 129
98. Question
Function of wetting agents used in casting procedure is:
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Question 99 of 129
99. Question
Component of inlay wax which makes it flake resistant is:
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Question 100 of 129
100. Question
The rate of tarnish and corrosion of class II cast material having VHN 200 is:
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Question 101 of 129
101. Question
Microstructure of cobalt chromium alloy in cast condition is:
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Question 102 of 129
102. Question
Within an hour after cementation of cast gold onlay patient complains of shooting pain every time the teeth comes together Most probable explanation is?
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Question 103 of 129
103. Question
Dendrites in cst alloys form by mechanism of:
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Question 104 of 129
104. Question
Which one of the following elements is NOT added is small amount to be used as grain refiners?
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Question 105 of 129
105. Question
Compared with noble metals, base metals show
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Question 106 of 129
106. Question
Binder in phosphate bonded investment is:
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Question 107 of 129
107. Question
Mechanical properties of Cp Titanium are similar to alloys
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Question 108 of 129
108. Question
Which of the following fuel gases used for soldering, has the highest heat content
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Question 109 of 129
109. Question
The effects associated with cold working can be eliminated by a heat treatment called:
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Question 110 of 129
110. Question
Which of the following increases castability of base metal alloys:
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Question 111 of 129
111. Question
With indirect spruing. Which one of the following porosities can be minimised
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Question 112 of 129
112. Question
During soldering, the solidus temperature of the filler material should be:
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Question 113 of 129
113. Question
The linear solidification shrinkage of Type IV Ni-Cr based alloys is:
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Question 114 of 129
114. Question
The solvent flux used for base metal soldering is:
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Question 115 of 129
115. Question
Which of the following cast gold alloys is used for fabricating partial denture frameworks
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Question 116 of 129
116. Question
In Base metal alloys, Corrosion resistance occurs due to:
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Question 117 of 129
117. Question
Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of:
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Question 118 of 129
118. Question
The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is:
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Question 119 of 129
119. Question
Nickel is added to wrought gold alloys as:
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Question 120 of 129
120. Question
Fins and spines on the casting is seen due to:
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Question 121 of 129
121. Question
Stages of annealing in order
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Question 122 of 129
122. Question
Solder and flux used for joining Elgiloy wires are:
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Question 123 of 129
123. Question
Dr. Taggart is associated with:
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Question 124 of 129
124. Question
Which of the following fuel gases is the best choice of heat source to carry out soldering process?
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Question 125 of 129
125. Question
The term ordered hardening heat treatment used in which of the following dental alloys?
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Question 126 of 129
126. Question
The best fuel gas when used with oxygen is:
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Question 127 of 129
127. Question
Linear coefficient of thermal expansion of metal used for metal caramic restoration range from:
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Question 128 of 129
128. Question
Annealing is also known as:
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Question 129 of 129
129. Question
Quartz is added to gypsum bonded investment to:
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