Up To Date Amalgams ( Dental Materials ) MCQs – Medical MCQs
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Latest Amalgams ( Dental Materials ) Mcqs
The most occurred mcqs of Amalgams ( Dental Materials ) in past papers. Past papers of Amalgams ( Dental Materials ) Mcqs. Past papers of Amalgams ( 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 Amalgams ( Dental Materials ) Mcqs. The Important series of Amalgams ( Dental Materials ) Mcqs are given below:
Dynamic creep is the______________?
A. Process whereby alloy is wetted by mercury
B. Deformation of set amalgam during function
C. Continuing alloying between silver-tin alloy and mercury during the life of restoration
D. Spread of amalgam during packing
The dental amalgam is most resistant to________________?
A. Compressive stress
B. Shear stress
C. Impact stress
D. Tensile stress
According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?
A. 80 Mpa
B. 260 Mpa
C. 140 Mpa
D. 510 Mpa
Admixed high copper alloy powder contains_________________?
A. 9-20% copper
B. 9-30% copper
C. 13-20% copper
D. 13-30% copper
Finishing and polishing of Amalgam make the restoration______________?
A. Increase in tarnish and corrosion resistance
B. Decrease the tarnish and corrosion resistance
C. Increase the marginal strength
D. Increased compressive strength
Setting time of Amalgam is best controlled by _______________?
A. Lathe cut alloy
B. Using spherical particles
C. Altering Hg-Alloy ratio
D. Trituration time
In non zinc containing dental amalgam alloy the percentage of zinc present is______________?
A. Less than 0.1%
B. Less than 0.02%
C. Less than 0.01%
D. None of the above
High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?
A. Have less marginal breakdown
B. Have a higher ratio of tensile to compressive strength
C. Are workable at lower Hg-alloy ratio
D. Have less resistance to tarnish and corrosion
The largest component of amalgam alloy is_____________?
A. Silver
B. Zinc
C. Tin
D. Copper
During amalgamation, trituration is done to_____________?
A. Remove excess mercury from the amalgam
B. Coat the alloy particle with mercury
C. Dissolve the alloy in mercury
D. Dissolve Hg in alloy
Amalgam restorations give the best clinical service when the residual mercury content is_______________?
A. 58-62%
B. 48-52%
C. 38-42%
D. 68-72%
Percentage of tin in low copper alloy is______________?
A. 13-32%
B. 26-28%
C. 30-35%
D. 22-30%
Cause of expansion in zinc containing amalgam is_____________?
A. Water
B. Zinc and water
C. Hydrogen
D. Nascent oxygen
What is common in amalgam and ceramics ?
A. Less compressive strength but more tensile strength
B. More compressive strength and tensile strength
C. More compressive strength but less tensile strength
D. Less compressive strength and tensile strength
Which of the following constituents of amalgam alloy decreases expansion____________?
A. Zinc
B. Copper
C. Silver
D. Tin
The higher the Hg alloy ratio in dental amalgam________________?
A. Lower the creep value
B. Higher the strength
C. More matrix matrial formed
D. More gamma 1 phase formed
Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________?
A. The resultant alloy varies according to the content of Ag of Cu
B. The resultant alloy is lesser
C. The resultant alloy is greater
D. None of the above
What is the recommended for condensation of dental amalgam ?
A. 15 lb
B. 3 pounds
C. 35 pounds
D. 25 lb
Which is not true about high copper amalgam alloys______________?
A. Low tensile and compressive strength
B. High tensile strength
C. Low Hg: Alloy ratio
D. Low creep
Amalgam means_____________?
A. A metallic powder composed of silver, tin, copper and zinc
B. An alloy of two or more metals one of which is mercury
C. A metallic substances in powder or tablet from that is mixed with mercury
D. An alloy of two or more metals that have been dissolved in each other in the molten state
In amalgam alloy which acts as oxygen scavenger_____________?
A. Pd
B. Zn
C. Cu
D. Ag
By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?
A. Zn
B. Ag
C. Cu
D. Hg
Which of the following statement is true regarding lathe cut low Copper silver alloy ?
A. Achieves high compressive strength at 1 hr.
B. Requires least amount of mercury
C. Has tensile strength both at 15 minutes and 7 days is comparable to high copper, unicompositional alloys
D. Has lower cree value
Creep value of which of the following is the highest ?
A. Low copper amalgam alloy
B. Single composition alloys
C. Admix alloy
D. Creep value of all the above mentioned alloys is same
Amalgam achieves 70% of the strength by____________?
A. 4 hours
B. 2 hours
C. 8 hours
D. 16 hours
Mercury is toxic because it_____________?
A. Inhibits anaerobic glycolysis
B. Inhibits hemoglobin synthesis, producing anemia
C. Complexes with hemoglobinto form methemoglobin
D. Binds to sulfhydryl groups
What fraction of inhaled mercury vapors retained in the body ?
A. 55-65%
B. 45-55%
C. 65-85%
D. More than 85%
The effect of trituration on strength in an amalgam restoration depends on______________?
A. Trituration time
B. Amalgam alloy
C. Speed of amalgamator
D. All of the above
Decrease in creep occurs in_______________?
A. Decreases with condensation pressure
B. Under trituration or over trituration of amalgam
C. Increase with condensation pressure
D. Cannot be predictable
Cavo surface angle for amalgam resoration is butt joint as____________?0
A. It increases compresssive and tensile strengths
B. Decreased compressive, decrease tensile strength
C. Decreased compressive, increased strength
D. Increased compressive, increased tensile strength
Which of the following are characteristic feature of high copper amalgam alloy ?
A. High marginal breakdown
B. Low compressive strength
C. Less marginal
D. High creep
Co-efficient of Thermal exansion of amalgam is______________?
A. 11.4 a (ppm k-1)
B. 6.6 a (ppm k-1)
C. 14.0 a (ppm k-1)
D. 25.0 a (ppm k-1)
A patient who has had a recent amalgam filling in the upper teeth has a gold filling in the lower teeth, the patient complains of pain. The reason for this can be mainly_____________?
A. Pulp exposure
B. Improper amalgam filling
C. Galvanism
D. None of the above
Outstanding clinical performance of dental amalgam restoration is related to its____________?
A. Compressive strength
B. Corrosion
C. Tensile strength
D. Creep
Absorption of mercury in the human body occurs least from_____________?
A. Skin
B. Gastro-intestinal Track
C. Lungs
D. Kidneys
High copper amalgam can be produced_____________?
A. From lathe cut particles
B. From irregular and spherical particles
C. From smooth atomized particles
D. From traditional alloy particles
Which one of the following is not an objective of trituration ?
A. Pulverize pelletes into particles to aid in attack by mercury
B. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum
C. Remove oxides from powder particle surface
D. Achieve a workable mass of amalgam in minimum time
Gallium and indium added to Amalgam replace______________?
A. Tin
B. Silver
C. Mercury
D. Zinc
Which is true regarding lathe cut silver alloy_______________?
A. Has low creep
B. Achieves lowest compressive strength at 1 hr.
C. Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy
D. Requires least amount of mercury
Adequate mixing of mercury is indicated by_______________?
A. Short Mixing Time
B. Shiny Mix
C. Dry Mix
D. None of the above
For dental amalgam, the elastic modulus and tensile strength is______________?
A. 350 Gpa and 10 – 120 Mpa
B. 21 Gpa and 27 – 55 Mpa
C. 40 Gpa and 60 – 100 Mpa
D. 360 Gpa and 125 – 130 Mpa
Which of the following does not occur in High Copper Amalgam ?
A. Chemical Corrosion
B. Electrochemical Corrosion
C. Penetrating Corrosion
D. Corrosion does not occur at all
High strength amalgam is achieved by_____________?
A. Maximum matrix phase
B. Minimum matrix and maximum alloy phase
C. Maximum matrix and minimum alloy phase
D. Minimum alloy phase
Once triturated, the Dental amalgam should be condensed with in_____________?
A. 6 minutes
B. 5 minutes
C. 3 minutes
D. 15 minutes
The solid solution of silver and mercury is called_______________?
A. y1
B. B1
C. y2
D. y
Advantage of minimum mercury technique or Eames technique is all Except________________?
A. Sets quickly
B. High strength
C. Needs no squeezing of excess mercury
D. Greater plasticity and adapts well to cavity walls
Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________?
A. Fracture of the restoration
B. Accelerated corrosion
C. Merginal damage
D. All of the above
Over-trituration of silver alloy and mercury_______________?
A. Decreases creep
B. Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam
C. Reduces contraction
D. Gives al dull and crumbly amalgam
Mercury intoxication in dental office mainly results from____________?
A. Ingestion of mercury
B. Inhalation of mercury vapours
C. Direct contact with the mercury
D. None of the above
The threshold limit value of mercury exposures is_______________?
A. mg / m3
B. 0.05 mg / m3
C. mg / m3
D. mg / m3
The tarnished layer of silver amalgam consists of________________?
A. Sulphides of silver
B. Chlorides of tin
C. Oxides of tin
D. All of the above
Which phase provides maximum strength in hardened mercury/silver alloy ?
A. Tin / Mercury phase
B. Silver / Tin phase
C. Silver / Mercury phase
D. Zinc / Mercury phase
Copper content in low copper amalgam is________________?
A. 6%
B. 29%
C. 12-30%
D. 19%
Which of the following silver amalgam alloy have the maximum strength________________?
A. Spherical
B. Lathe cut
C. Admixed
D. Single composition
What is the most frequently used restorative material ?
A. Composite
B. Amalgam
C. Silicate
D. Gold
How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?
A. 1-2 days
B. 24 hours
C. 3-5 days
D. 7 days
The percentage of copper in high copper alloy is______________?
A. 0-6%
B. 10-12%
C. 13-30%
D. 20-30%
What is the working time of amalgam?
A. Five to six minutes
B. Three to four minutes
C. One to two minutes
D. Seven to eight minutes
Advantage of zinc containing amalgam is_______________?
A. Better handling property
B. Resistance to creep
C. Dimensional Stability
D. Toxicity to pulp and dentin
Discolouration of silver alloy is due to_____________?
A. Wet corrosion
B. Tarnish and corrosion
C. Tarnish
D. Dry corrosion
Moisture contamination of amalgam can lead to_____________?
A. Shrinkage
B. Marginal breakdown
C. Delayed expansion
D. increased stresses
In a high copper amalgam the phase, which is eliminated is_______________?
A. Gamma 1 and 2
B. Gamma 2
C. Gamma 1
D. No phase is eliminated
Well premeasured capsules of amalgam can release mercury vapour during_______________?
A. Carving
B. Mulling
C. Condensation
D. Trituration
In spherical alloys as compared to lathe cut____________?
A. Less condensing force is required
B. Manipulation is easy
C. Both require same condensing force
D. More condensing force is required
Chronic mercury toxicity results from_____________?
A. Skin contact
B. Ingestion while removing old amalgam
C. Mercury vapour
D. All of the above
Increase in the residual mercury in silver amalgam filling can_____________?
A. Cause fracture of the filling
B. Increase the strength
C. Tarnish and corrosion
D. Decrease condensation pressure
Which of the following statements about high copper silver alloy compared to conventional alloy is not true ?
A. It’s edge strength is greater
B. It has poor tarnish and corrosion resistance
C. It has increased tensile and compressive strength
D. Mercury content in the final restoration is less
Compare to conventional amalgams, spherical amalgams_______________?
A. Require heavy compection forces
B. Require more mercury
C. Have longer setting times
D. None of the above
Which of the following phases of dental amalgam has minimum strength____________?
A. Epsilon 1
B. Gamma 2
C. Gamma 1
D. Gamma 3
The ADA specification No 1 for composition of amalgam alloy recommends______________?
A. 49% silver, 32% tin and 19% cooper
B. 65% silver, 32% tin and 3% copper
C. 65% silver, 29% tin and 5-6% copper
D. None of the above
The highest mercury concentration in amalgam filling is found_____________?
A. At the margin of the restoration
B. In the deepest part of the restoration
C. In the centre of the restoration
D. None of the above
The term trituration means____________?
A. Removal of excess of mercury
B. Mixing of amalgam alloy and mercury
C. Lysing amalgam alloy
D. None of the above