Medical MCQs – Competitive Restorative Resins ( Dental Materials ) MCQs
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Latest Medical MCQs
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Latest Restorative Resins ( Dental Materials ) Mcqs
The most occurred mcqs of Restorative Resins ( Dental Materials ) in past papers. Past papers of Restorative Resins ( Dental Materials ) Mcqs. Past papers of Restorative Resins ( 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 Restorative Resins ( Dental Materials ) Mcqs. The Important series of Restorative Resins ( Dental Materials ) Mcqs are given below:
Which of the following is present in the powder of the acrylic resin______________?
A. Methyl methacrylate
B. Hydroquinone
C. Benzoyl peroxide
D. D-methyl paratolouidine
Boiling point of methyl methacrylate________________?
A. B.P of water
B. Equal of BP of water
C. < B.P of water
D. Is at normal room temperature
The main advantage of composites over unfilled direct filling resin is their_____________?
A. Lower modulus of elasticity
B. Higher solubility in saliva
C. Esthetic excellence
D. Lower thermal co-efficient of expansion
Composite has_______________?
A. Filler
B. Resin
C. Resin & Filler
D. None
Acrylic resins are used for______________?
A. Temporary bridges
B. Anterior restorations
C. Denture base
D. All of the above
To prevent porosity in self-cure acrylic resin, curing should be carried in______________?
A. Hot water
B. Cold water
C. Under tap water
D. Under vacuum pressure
Porosity present in a acrylic denture is usually the result of______________?
A. Insufficient acrylic resin monomer
B. Lack of sufficient pressure applied to flask
C. A prolonged curing cycle
D. Prolonged bench cooling after curing
Cross linking in denture base resin is contributed by_____________?
A. Glycol dimetharylate
B. N-para toluidine
C. Benzoyl peroxide
D. Methyl methacrylate
Hydroquinone is added to methyl methacrylate monomer_________________?
A. To prevent polymerization during storage
B. To enable polymerization reaction at room temperature
C. To initiate release of free radicalls
D. All of the above
Which of the following inhibitor accelerator system uses light activation composite ?
A. Diketone-amine
B. Organic acid-peroxide
C. Organic acid-metal oxide
D. Peroxide-amine
Which of the following is an example of a composite material ?
A. A filled resin
B. Gold alloy
C. Colloidal silica
D. Wax
In heat cure denture base acrylic resins the monomer is___________?
1. Methacrylate
2. Methyl ethyl methacrylate
3. Ethylmethacrylate
4. Polymethylmethacrylate
Light cure system, side effect is____________?
A. Cataract
B. Iritis
C. Conjunctivitis
D. Retinal damage
Bonding of composite resins to tooth structure is by________________?
A. Ionic bond
B. Covalent bond
C. Mechanical
D. Vanderval forces
The type of spatula used to mix composite is________________?
A. Plastic
B. Iron
C. Stainless steel
D. None of the above
Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ?
A. Low impact strength
B. Excessive expansion
C. Excessive shrinkage
D. Excessive brittleness
Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________?
A. UV light
B. Infrared light
C. Visible light
D. Diketone
Porosity of denture base is due to_______________?
A. Inadequate pressure
B. Curing at 160°F for 9 hrs
C. Packing at dough stage
D. All of the above
The imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called_____________?
A. Gas inclusion porosity
B. Localised Shrinkage porosity
C. Micro porosity
D. Surface porosity
The particle size in microfilled composites is_____________?
A. 0.5 to 1.0 microns
B. 0.05 to 0.04mm
C. 0.01 to 0.1 microns
D. 0.3 to 0.4mm
A material which is a mixture of two different materials and its properties are_____________?
A. Composite
B. Combined
C. Complex material
D. Compound
Co-efficient of thermal expansion is highest for_____________?
A. Silicate cement
B. Amalgam
C. Gold alloy
D. Acrylic resin
The latest method of curing denture base resins______________?
A. Chemicals
B. Visible light
C. Heat
D. Lasers
One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?
A. Adapt to the walls of the cavity better
B. Are practically insoluble in oral fluids
C. Prevent galvanic action
D. Have a higher coefficient of thermal expansion
To cure a heat cure resin, a proper heating cycle is necessary_____________?
A. To prevent the porosity
B. To prevent volume expansion
C. To prevent warpage
D. All of the above
When restoring a tooth with resin material, acid etching can do all of the following except______________?
A. Create surface irregularities in enamel for better mechanical retention of resin
B. Permit chemical bonding between resin and enamel
C. Increase the surface area
D. Condition the tooth surface for better wetting
For esthetic areas where high luster is required the restoration used usually______________?
A. Hybrid resin composites
B. Glass ionomer restoratives
C. Microfilled resin composites
D. Macrofilled resin composites
Which of the following absorbs maximum amount of water ?
A. Microfilled resin
B. Hybrid
C. Macrofilled resin
D. Light cure activated
The restoration which shows percolation and shrinkage along the margins is_____________?
A. Amalgam
B. Unfilled resins
C. Composites
D. Polycarboxylate
The commonly used laser for curing composite resin is______________?
A. CO2
B. Nd:YAG
C. ER:YAG
D. Argon
What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?
A. 6%
B. 10%
C. 8%
D. 21%
Macromolecules in Dental Resin is attached by______________?
A. Covalent bonds
B. Vander Wall’s Forces
C. sonic bonds
D. Hydrogen Bonds
Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________?
A. Mechanical properties
B. Thermal properties
C. Biological properties
D. Esthetic properties
The most common coupling agents are organic silicon compound called_______________?
A. Ligane
B. Parabane
C. Silane
D. Chelane
One bottle system of adhesive resins_____________?
A. Separate etching step not required
B. 4th generation bonding agents
C. Separate etching step is still required
D. Contains only primer
Most advantageous indication of acid etching is______________?
A. Decrease micro leakage
B. Decrease coefficient of thermal expansion
C. Decrease polymerization shrinkage
D. Decrease porosity in restorative material
VLC resins are also called as______________?
A. Tertiary amine-activated resins
B. Microwave-activated resins
C. Light activated resins
D. Heat activated resins
Cold cure acrylic expand in water by___________?
A. 1% by volume 0.23% by weight
B. 0.1% by volume 0.23% by weight
C. 10% by volume 0.23% by weight
D. None of the above
Which of the following is NOT true of polymethyl methacrylate ?
A. Tensile strength of 60 MPa
B. Knoop hardness number 18 to 20
C. Density of 1.13 g/cm3
D. Modulus of elasticity of 3.4 GPa
Etchant preferred in gel from than in liquid form________________?
A. Better control over placement
B. Helps in visualization while placement
C. Enhance and concentrate the action of acid
D. None of the above
During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?
A. 37°C
B. 25°C
C. 50°C
D. 60°C
Amalgams MCQs
Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
A. 10 um – 20 um
B. 50 um – 110 um
C. 3 um – 9 um
D. 200 um – 250 um
The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?
A. 3:1
B. 10:1
C. 4:1
D. 5:1
Residual monomer content of chemically activated resins is______________?
A. 0.3% to 0.5%
B. 2% to 5%
C. 0.2% to 0.5%
D. 2% to 5%
Dentin conditioner has the following function______________?
A. Removes smear layer
B. Helps in bonding with composite
C. Forms a thin resin layer over exposed collagen fibrils
D. Increases surface energy of dentin
The process wherein two or more chemically different monomers, each with some desirable property, can be combined to yield specific physical properties of a polymer is known as_____________?
A. Addition polymerization
B. Step-growth polymerization
C. Condensation polymerization
D. Copolymerization
Denture acrylics contain cross-linking agents mainly to improve their_____________?
A. Tissue compability
B. Internal color
C. Surface hardness
D. Craze resistance
Subsurface porosity is due to_____________?
A. Thermal changes
B. Lack of temperature
C. Thickness of the resin
D. Packing past the dough stage
If resin is packed in sandy stage what will be seen in the processed denture ?
A. Inhomogeneous colour
B. Porosity
C. Distortion
D. Increased strength
Which one of the following is used as filler in composite resins ?
A. Quartz
B. Zinc particles
C. Silicates
D. Aluminium
Insufficient closure of the flasks during packing of denture base resin can result in_____________?
A. Less polymerization shrinkage
B. Poor colour stability
C. Increase in vertical dimension
D. Decrease in vertical dimension
Quartz tungsten light cure device minimum output of energy should not be less than_____________?
A. 300 mw/sm2
B. 400 mw/cm2
C. 350 mw/cm2
D. 450 mw/cm2
Polymerisation of heat-cured methyl methacrylate is initiated by______________?
A. Hydroquinone
B. Benzoyl peroxide free radical
C. Tertiary amine
D. Methyl ether
In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
A. Near the borders
B. Throughout the denture
C. In the thickest part
D. On the denture surface
Composite resins in comparison to acrylic have_______________?
A. High water absorption
B. High abrasive resistance
C. Low compressive strength
D. High polymerization shrinkage
Insufficient closure of the flasks during packing of denture base resin can result in_____________?
A. Less polymerization shrinkage
B. Poor colour stability
C. Increase in vertical dimension
D. Decrease in vertical dimension
Subsurface porosity is due to_____________?
A. Thermal changes
B. Lack of temperature
C. Thickness of the resin
D. Packing past the dough stage
If resin is packed in sandy stage what will be seen in the processed denture ?
A. Inhomogeneous colour
B. Porosity
C. Distortion
D. Increased strength
Which one of the following is used as filler in composite resins ?
A. Quartz
B. Zinc particles
C. Silicates
D. Aluminium
The chemical used to etch enamel is_______________?
A. Methyl methacrylate
B. Zinc oxide
C. Phosphoric acid
D. Eugenol
Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?
A. Incorporation of terminating agents
B. Addition of difunctional monomers
C. Increasing the amount of heat required for linear polymerization
D. Addition of grain refining agents
For photo-curing the composite resin the light source______________?
A. Should be held at a millimeter distance from the restoration
B. Is fiber optic
C. Will cure composite upto a depth of 5 millimeter thickness
D. Need no protection while in use
In self-cure acrylic resin, activator is_____________?
A. Quaternary ammonium compound
B. Toluidine
C. Benzoyl peroxide
D. Tertiary amine
Marginal leakage related to temperature change occurs to the greatest extent with_______________?
A. Composite resin
B. Unfilled resin
C. Amalgam alloy
D. Direct filling gold
Acrylic resins were first introduced as a denture base material in______________?
A. 1951
B. 1937
C. 1925
D. 1956
What is the disadvantage of using composites as restorative material ?
A. Decreased thermal conductivity
B. Decreased wear resistance
C. Increased thermal conductivity
D. None of the above
The % of free monomer in a heat – cured acrylic resin is_______________?
A. 8% to 10%
B. 3% to 5%
C. 0.2% to 0.5%
D. 0.6% to 0.8%
Inadequate pressure application during flasking_______________?
A. Increases vertical dimension
B. Causes poor quality of colour
C. Causes teeth to be shrunken in investment
D. Causes fracture of denture
Inorganic phase of the composites aid in_______________?
A. Reducing the polymerization shrinkage
B. Decreasing the coefficient of thermal expansion
C. Increasing the mechanical strength
D. All of the above
About polymerization shrinkage of composite all are true, except______________?
A. Polymerization shrinkage is greater if bonded surface area is lesser than unbounded surface area
B. Microleakage can occur because of polymerization shrinkage
C. Acid etching and priming will decrease polymerization shrinkage
D. Polymerization shrinkage is high if within the enamel margins
The advantage of unfilled methyl methacrylate is that______________?
A. It can be finished smoothly
B. It’s non-irritation to pulp
C. It has a low degree of flow
D. It’s wear resistant is high
Dentin bonding agents usually contain_____________?
A. Only Hydrophilic component
B. Only Hydrophobic component
C. Hydrophobic and hydrophilic component
D. Lyophillic and lyophobic component
Which of the following provide opacity to composite ?
A. BIS-GMA
B. TEGDMA
C. Ti02
D. None of the above
The polymerization of self-curing resin takes faster in______________?
A. Under pressure
B. Hot water
C. Cold water
D. In vaccum
Acid-etching is done for_______________?
A. 30 seconds
B. 90 seconds
C. 60 seconds
D. 120 seconds
No trail closure is necessary with which one of the technique during denture fabrication_____________?
A. Fluid resin technique
B. Injection moulding technique
C. Compression moulding technique
D. Light cured technique
The function of the coupling agent in a restorative resin is to allow______________?
A. Bonding between filler crystals
B. Adhesion of resin particles
C. Bonding between filler and resin
D. Bonding between tooth and resin
Which of the following constituents is common in occlusal sealants, bonding agents, composite resins ?
A. BIS GMA
B. Benzoin methyl ether
C. Polymethyl methacrylate
D. Silica filter
The most important disadvantage of acrylic denture base is_______________?
A. Tooth breakage
B. Shrinkage
C. porosity
D. Water absorption
Radio opacity to composite resins is rendered by_______________?
A. Organic matrix
B. Silica glass
C. Barium glass and strontium glasses
D. Fluoride particles
Acrylic (cold cure)______________?
A. Softens at 100°C
B. Melts at 100°C
C. Still requires heat for polymerization
D. Produces heat during polymerization
Use of dimethyl-P-toluidine is indicated for_______________?
A. Retarding the polymerization reaction
B. Chemical polymerization
C. Thermal polymerization of acrylic
D. To inhibit the action of benzoyl peroxide
If curing occurs at temperature more than 100°C porosity results in which area of denture______________?
1. Hard thick central area
2. Thin area of flanges
3. Thin Palatal area
4. Porosity is uniformly distributed
All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
A. The former are more porous
B. The former have higher residual monomer content
C. The former have a lower molecular weight
D. The former have greater transverse strength