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Medical MCQs – Impression Materials ( Dental Materials ) MCQs

Medical MCQs – Impression Materials ( Dental Materials ) MCQs

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Latest Medical MCQs

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Latest Impression Materials ( Dental Materials ) Mcqs

The most occurred mcqs of Impression Materials ( Dental Materials ) in past papers. Past papers of Impression Materials ( Dental Materials ) Mcqs. Past papers of Impression Materials ( 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 Impression Materials ( Dental Materials ) Mcqs. The Important series of Impression Materials ( Dental Materials ) Mcqs are given below:

Rough and irregular surface produced on the impression is because of ?

A. Improper application of pressure during impression making
B. Presence of moisture in impression area
C. Too rapid polymerization
D. Air incorporated during mixing

The impression materials with lowest viscosity is_____________?

A. Plaster of paris
B. Zinc oxide eugenol
C. Agar – agar
D. Elastomers

The ranking of tear strength from the lowest to highest of all impression materials generally is as follows_______________?

A. Hydrocolloids, silicones, polyether, polysulfide
B. Polysulfide, hydrocolloids, silicones, polyether
C. Silicones, hydrocolloids, polyether, polysulfide
D. Hydrocolloids, polyether, silicones, polysulfide

Most mucostatic among the following_____________?

A. Alginate
B. Impression compound
C. ZOE paste
D. Elastomer

Which of the following impression material requires a hardener ?

A. Agar
B. Elastomers
C. Alginate
D. Impression compound

By product of condensation reaction between silicone base and alkyl silicate in presence of tin octate_______________?

A. Ethyl alcohol
B. Acetate
C. Glycol
D. Propanolol

Which of the following component acts as an accelerator in ZOE impression paste ?

A. Zinc Sulphate & Zinc chloride
B. Zinc Sulphate & Eugenol
C. Zinc chloride & Eugenol
D. Glycerin

Dimensional stability of elastomeric impression material can be given in descending order as_____________?

A. polyether > Condensation silicone > Polysulphide > Addition silicone
B. Polysulphide > polyether > Condensation silicone > Addition silicone
C. Addition silicone > polyether > Polysulphide > Condensation silicone
D. Addition silicone> Condensation silicone > Polysulphide > polyether

A laminate impression technique utilizes_______________?

A. Syringe agar and chilled tray alginate
B. Syringe agar and impression compound
C. Syringe agar and tray agar
D. Chilled alginate and impression compound

Most flexible impression material______________?

A. Impression compound
B. Addition silicone
C. Impression paste
D. Alginate

Which of the following is correct arrangement of impression material regarding linear contraction in ascending order ?

A. Addition silicone < polyether < polysulfide < condensation silicone
B. condensation silicone < polyether < polysulfide < Addition silicone
C. Addition silicone < polysulfide < Polyether < condensation silicone
D. condensation silicone < polysulfide < polyether < Addition silicone

Metallurgy MCQs

Which of the following best describes the working time of impression material ?

A. Loss of lusture of impression material
B. Just after the start of appearing elastic properties of impression material
C. The time for start of mixing till just before the start of appearing elastic properties of impression material
D. After the start of appearing elastic properties of impression material

Which of the following is used as surface hardener in Impression material ?

A. 2% Potassium sulfate
B. 2% sodium sulfate
C. 0.2% Potassium sulfate
D. 4% Potassium sulfate

Which of the following is correct regarding chemical setting of condensation silicone_______________?

A. Polymerization occurs with repeated elimination of small molecules
B. Polymerization occurs with elimination of single byproduct
C. Condensation does not occur at all
D. By condensation of repeated molecules of monomers

Dimensional stability of hydrocolloid impressions may be achieved by_________________?

A. Storing the impression under water
B. Using less water powder ratio
C. Prolonged manipulation
D. Using humidor

To make the vinyl Polysiloxane hydrophilic the following is added_______________?

A. Water
B. Surfactant
C. Mineral oil
D. Plasticizer

The role of magnesium chloride in zinc oxide eugenol impression paste_________________?

A. Retarder
B. Plasticier
C. Modifier
D. Accelerator

Alginates are made dust free by adding______________?

A. Glutamic acid
B. Glyecrol
C. Glycol
D. alcohol

The process of changing the rubber base product or liquid polymer, to a rubber like material is generally known as_____________?

A. Condensation
B. Boiling
C. Vulconization
D. Chain lengthening

Which of the following is not true about elastomeric impression ?

A. Single mix material have higher viscosity
B. Shear thinning is related to viscosity of non phase impression material
C. Putty – wash technique of impression reduces dimensional change of setting
D. Improper mixing of material can cause permanent deformation of impression

Impression compound is characterized by all of the following except_______________?

A. Low coefficient of thermal conductivity
B. Is a thermoset material
C. Shows increased flow when kneaded with water
D. Warps at room temperature

Rapid removal of rubber impression with a single firm motion results in____________________?

A. Improved adhesion of the impression to the tray
B. Reduced dimensional instability
C. Minimal permanent deformation
D. Reduced contamination by saliva

Which of the following impression material is rigid ?

A. Zinc oxide-eugenol
B. Alginate
C. Reversible hydrocolloid
D. Polysulphide rubber

Elastomers except: Polyether are_______________?

A. Water loving impression materials
B. Hydrophobic
C. Hydrophilic
D. Potassium alginates

Hardening solutions are used with impression made of________________?

A. Hydrocolloid
B. Elastomer
C. Impression compound
D. Zinc oxide eugenol

Alginate impression material is similar to Agar-agar impression material in the following respect________________?

A. Mixing time is increased to reduce the setting time
B. Gelation increase in both on increase in temperature
C. Deformation during removal of impression occurs due to distortion of gel fibers
D. Both can be re-used for fresh impressions

Gelation temparature of agar is between________________?

A. 27°C to 33°C
B. 20°C to 25°C
C. 37°C to 50°C
D. 55°C to 60°C

Brush heap structure is found in______________?

A. Condensation silicone
B. Agar
C. Zinc oxide impression material
D. Polyether

Dental Cements MCQs

Masterial causing minimum tissue distortion is______________?

A. Silicone
B. Polysulphide
C. Impression plaster
D. Zinc oxide eugenol paster

Inelastic impression material is_____________?

A. Impression compound
B. Agar-agar
C. Alginate
D. Polyether

One of the most important advantages of truly elastic impression material would be its capacity for______________?

A. Reproduction of surface details
B. With drawl without permanent distortion
C. Close adaptation to soft tissues
D. Compatibility with gypsum products

Impression compound base_____________?

A. Low thermal conductivity
B. Formation of cross linkage with heating
C. Crystalline structure
D. High fusion temperature

Hypersensitivity reactions like contact dermatitis can be caused by______________?

A. Condensation silicones
B. polysulfides
C. addition silicones
D. Polyether

Trisodium phosphate in alginate acts are_______________?

A. Retarder
B. Accelerator
C. Reactor
D. Plasticizer

Which of the following impression material is elastic________________?

A. Zinc Oxide eugenol (ZOE) paste
B. Impression compound
C. Wax
D. Polyvinyl siloxane

The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?

A. 19
B. 21
C. 20
D. 26

Elastomers are_________________?

A. Agar
B. Alginate
C. Polyethers
D. Imp. Compound

Tear strength for impression material is highest for__________?

A. Alginate
B. Condensation silicone
C. Polysulfide
D. Addition silicone

Trisodium phosphate added to alginate contributes towards_______________?

A. increasing the working time of alginate impression material
B. Initiating the setting reaction
C. Acts as an accelerator
D. Provides gel strength

Agar syringe material can be used with/as______________?

A. Alginate impression material
B. Agar
C. Both of the above
D. Primary impression

Impression compound has which of the following characteristic property ?

A. Low thermal conductivity
B. Degradation is presence of moisture
C. High flow property
D. Remain distortion free up to 72 hrs. pouring can be safely delayed

Heavy and light body impression materials are use with______________?

A. Silicone
B. Mercaptan
C. Reversible hydrocolloid
D. A and B

Which material is the most difficult to remove from the patients mouth ?

A. Metallic oxide paste
A. Reversible hydrocolloid
B. Silicone impression material
C. Impression plaster

Direct Filling Gold MCQs

Before pouring an elastic impression it is washed with slurry of water and stone to______________?

A. Prevent syneresis
B. Increase gel strength
C. Prevent distortion
D. Wash off saliva on impression

The basic constituent of reversible hydrocolloid impression material is________________?

A. Agar
B. Gelatin
C. Alginic acid
D. alginate

Sol – gel transformation is seen in________________?

A. Elastomer
B. Hydrocolloids
C. Impression plaster
D. Impression compound

Setting time of ZOE is best controlled by______________?

A. Adding a drop of water
B. Adding a drop of eugenol
C. Cooling the glass slab
D. Altering ratio of two pastes

Impression plaster is_____________?

A. Less compressive than alginate
B. As compressive as alginate
C. More compressive than alginate
D. More compressive than hydrocolloids

Vulcanization refers to the setting of__________________?

A. Zinc Phosphate cement
B. Mercaptan impression material
C. Reversible hydrocolloid
D. Zinc oxide-eugenol

Impression techniques are used for recording________________?

A. Dental hard tissues
B. Oral mucosal tissues
C. Oral mucosal tissues and dental hard tissues
D. None of the above

Syneresis seen in hydrocolloid gel is______________?

A. Seen as water loss
B. Shrinkage
C. Water absorption
D. Gelation

Best material for duplicating cast is_______________?

A. Agar-agar
B. Zinc oxide eugenol
C. Alginate
D. Plaster of paris

The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group_______________?

A. Silane group
B. Hydroxyl group
C. Marcaptan group
D. Virryl group

Hysteresis in a hydrocolloid gel is______________?

A. Phenomenon of conversion of gel into sol
B. Temperature lag between gelation and liquefaction temperature
C. Moisture absorption
D. All of the above

All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?

A. Cooling mixing slab
B. Adding a small amount of water
C. Altering the amounts of the two pastes used
D. Adding a small amount of glycerine

All of the following statements about Type II silicon impression material are true EXCEPT_______________?

A. They exhibit a very low setting shrinkage
B. They evolve hydrogen when cast if they are not fully cured
C. They have a lower tear resistance than polysulphide rubbers
D. They set by condensation polymerisation

The Zinc oxide-eugenol impression pastes harden by________________?

A. Chemical reaction
B. Heat
C. Cold
D. Pressure

Medical MCQs – Impression Materials ( Dental Materials ) MCQs