Updated Metallurgy ( Dental Materials ) MCQs – Medical MCQs
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Latest Medical MCQs
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Latest Metallurgy ( Dental Materials ) Mcqs
The most occurred mcqs of Metallurgy ( Dental Materials ) in past papers. Past papers of Metallurgy ( Dental Materials ) Mcqs. Past papers of Metallurgy ( Dental Materials ) Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Metallurgy ( Dental Materials ) Mcqs. The Important series of Metallurgy ( Dental Materials ) Mcqs are given below:
Stages of annealing in order_________________?
A. Recovery recrystallization grain growth
B. Grain Growth Recrystallization recovery
C. Recrystallization recovery, grain growth
D. Melting point, grain growth, Recrystallization
The term ordered hardening heat treatment used in which of the following dental alloys ?
Linear coefficient of thermal expansion of metal used for metal caramic restoration range from________________?
Quartz is added to gypsum bonded investment to______________?
A. aid in hygroscopic expansion
B. Counter balance contraction of gypsum during heating
C. Increase the strength
D. Increase the shelf life of investment
Annealing is also known as_______________?
A. Hard hardening treatment
B. Soft hardening treatment
C. Precipitating heat treatment
D. Stress relieving heat treatment
The best fuel gas when used with oxygen is______________?
A. Natural gas
Which of the following fuel gases is the best choice of heat source to carry out soldering process ?
B. Natural gas
Solder and flux used for joining Elgiloy wires are_____________?
A. Gold solder and fluoride flux
B. Gold solder and borax flux
C. Silver Solder and borax flux
D. Silver solder and fluoride flux
Fins and spines on the casting is seen due to_______________?
A. Water film contamination
B. Rapid heating me
C. Prolonged heating
D. Too high pressure during casting
The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?
D. Depends on the alloy type
In Base metal alloys, Corrosion resistance occurs due to___________________?
B. High Fusion Temperature
C. High Molecular Weight
D. Co-efficient of Thermal Expansion
The solvent flux used for base metal soldering is_______________?
B. Boric acid
During soldering, the solidus temperature of the filler material should be_____________?
A. Equal to the substrate material
B. Lesser than the substrate material
C. Greater than the substrate material
D. Temperature not relevant
Which of the following increases castability of base metal alloys________________?
Which of the following fuel gases used for soldering, has the highest heat content______________?
A. Natural gas
Binder in phosphate bonded investment is______________?
A. Magnesium oxide & Phosphoric acid
B. Magnesium oxide & Phosphate
C. Magnesium oxide & Monoammonium phosphate
D. Magnesium oxide & Ortho Phosphoric acid
Which one of the following elements is NOT added is small amount to be used as grain refiners ?
Within an hour after cementation of cast gold onlay patient complains of shooting pain every time the teeth comes together Most probable explanation is ______________?
A. Excess acid in mix
B. Retained cement in gingival sulcus
C. Supracocclusion of restoration
D. Galvanic current caused by gold onlay occluding with a large restoration
The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?
B. 5 to 10%
C. 2 to 3%
Function of wetting agents used in casting procedure is_________________?
A. To felicitate wetting of ring liner
B. For better wax elimination
C. To reduce contact angle of liquid with max surface
D. To felicitate mixing investment
The deoxidizing agent added to dental alloys is______________?
Which of the following is function of fluoride flux in soldering process ?
A. Increase the strength of solder
B. It prevents the formation of chromium oxide or dissolves chromic oxide layer
C. It prevents the flow of material in undesirable area
D. It prevents the formation of copper oxide
Percentage of gold in high noble alloy is______________?
B. N 25%
Gases dissolved in molten metals are liberated when cooled giving rise to________________?
A. Localized shrinkage porosity
B. Gas inclusion porosity
C. Suckback porosity
Casting flux is used to_______________?
A. increase the melting point of the flux
B. Prevent the oxidation of the metal during melting
C. Flaring the point of the sprue attachment
D. None of the above
The main ingredient of inlay wax is__________________?
A. Carnauba wax
B. Paraffin wax
C. Candellila wax
D. Gum dammar
Who was the first person to introduce cast inlay restoration into dentistry ?
A. William H Taggart
C. G.V. Black
Disadvantage of having a short sprue is________________?
A. No place for reservoirs
B. Rapid solidification of metal
C. Incomplete evacuation of gases
D. Difficulty in removing casting from investment
18-B Stainless steel orthodontic wire has_______________?
A. 18% Chromium 8% Cobalt
B. 18% Chromium 8% Nickel
C. 18% Nickel 8% Chrominum
D. 18% Carbon 8% Iron
Inlay wax is used to_______________?
A. Invest inlay patterns
B. Make inlay wax patterns
C. Temporarily cement inlays
D. Box models
Quartz in investment material is added for_______________?
A. Decrease strength
B. Expansion components for casting shrinkage
The sprue in wax pattern should be placed________________?
A. At obtuse angle
B. At 45°C angle
C. At right angle
D. It depend upon type of wax pattern
Gold content of an 18 carat alloy is______________?
Titanium casting is done_____________?
A. Under vacuum in argon atmosphere
B. In specially fabricated aluminium vanadium
C. Under air pressure in nitrogen atmosphere
D. Using CAD-CAM technique
Heat hardening is the process done at_______________?
A. Heating quickly upto 450°C followed by sudden quenching
B. Heating 750°C and slowly cooling to zero degree
C. Heating upto 250°C for 15 to 30 min
D. Heating at 750°C and then quenching to room temperature
Crucible indicated for casting base metal alloys is______________?
A. Clay crucible
B. Carbon crucible
C. Quartz crucible
D. High melting plastic crucible
Which of the following refractory is used to counteract most of the expansion________________?
Passivating alloys are_______________?
A. Cr, Al, Ti
B. Cr, Gold, Ti
C. Cr, Mo, Ti
D. Cr, Fe, Ti
Waxes are used for_______________?
A. Impression of single tooth
B. Corrective impressions
C. Primary impression
D. None of the above
A common electrolyte used for plating copper indirect dies is_______________?
A. Ionic copper
B. Copper cynide
C. Acidic copper sulfate
D. Silver cyanide
Stainless steel is used mostly in dentistry_________________?
A. To construct clasps for partial dentures
B. In orthodontic wires
C. To strength amalgam
D. To replace internal gold restorations
The base constituents of dental waxes come from three main sources except______________?
The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?
A. Utility wax
B. Beading wax
C. Base plate wax
D. Boxing wax
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__________?
A. Gas inclusion porosity
B. Pinhole porosity
C. Micro porosity
D. Subsurface porosity
Function of carnauba wax_________________?
A. Increase toughness
B. To provide a smooth and glossy surface
C. Decrease toughness
D. Decrease flow at room temperature
Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?
Softening heat treatment of alloy increases_________________?
A. Proportional limit
B. Tensile strength
The function of a sprue is to_______________?
A. Form an opening of molten metal to enter the mold
B. Eliminate air bubbles on the wax pattern
C. Help polish cast restorations
D. Reproduce fine detail
Stabilization of stainless steel is achieved by adding____________?
The yield strength of AUstenite (NiTi alloy) is______________?
A. 240 Mpa
B. 100 Mpa
C. 560 Mpa
D. 700 Mpa
A highly polished surface on a metallic dental restoration aids considerably in the prevention of the____________?
A. Thermal conductivity
B. Dimensional change
D. Tarnish and corrosion
Tublulence of molten gold is due to _____________?
A. Improper venting
B. Impurities in gold
C. A and B
D. None of the above
In a patient with allergy to costume jewelry, which of the following is contraindicated______________?
A. Low gold
B. High gold
C. Palladium – Ag
D. Ni – Cr
Indium in metal alloys_______________?
A. Harden the metal ceramic Ag-Pd alloy
B. Improve bonding
C. Both A and B
D. None of the above
Mouth temperature waxes are_______________?
A. Iowa wax
B. Green stick wax
C. Modeling wax
D. None of the above
Incomplete casting is the result of_____________?
A. Hollow sprue pin
B. Narrow sprue diameter
C. More porous investment in the mould
D. Large reservoir
Glossy smooth margins of a casting are due to_____________?
A. Investment breakdown
B. Shrinkage of alloy on cooling
C. Incomplete wax elimination
D. Incomplete gas elimination
Gypsum bonded investment should not be heated over______________?
Cobalt-Chrominum alloys contains_______________?
A. 1% palladium
B. 60% cobalt and 30% chrominum
C. 30% cobalt and 60% chrominum
D. 20% gold
The most commonly used Titanium alloy for dental and medical purposes is________________?
A. Ti 6Al 4V
B. Ti 5Al 5V
C. Ti 5Al 4V
D. Ti 6Al 6V
Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?
A. Continuous expansion
B. Decrease flow
C. Relaxation of the internal stresses
D. Water loss
The maximum carbon content of steel used in dentistry is__________________?
Flux is used during casting to________________?
A. Remove the oxides formed on the gold alloy
B. Replace casting wax
C. Lower the melting point
D. Speed the burnout process
Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?
C. High quality iron
Which is the use of boxing an impression______________?
A. Preserving the sulci
B. Ease of construction of denture
C. Ease of pouring an impression
D. All of the above
Gap between true end of casting ring and wax pattern should be______________?
A. ¼ inch
B. 3/8 inch
C. ½ inch
D. one inch
Addition of large amounts of platinum to a casting gold alloy will________________?
A. Decrease its strength and ability to be hardened
B. Redden the alloy
C. Increase its fusion temperature
D. Decrease its tarnish resistance
All of the following statements about cast cobalt alloy are true EXCEPT_____________?
A. They have a modulus of elasticity twice that of gold alloys
B. They have a lower proportional limit than gold alloys
C. They have higher ductility than gold alloys
D. They are more rigid than gold alloys