Multiple Choice Questions In Conservative Dentistry - Tooth Colored Restorations

# Restoration of angle fracture of anterior teeth can be done by:
A. Amalgam
B. Composite resin
C. Glass ionomer cement
D. All of the above

# Replanted avulsed tooth can be aesthetically stabilized by:
A. Occlusal splints
B. Composite resins
C. Arch bar
D. All of the above

# The main disadvantages of composites not being recommended for class II posterior restorations are:
A. Color matching is not good
B. Lacks sufficient strength
C. Occlusal wear
D. Frequent fractures at the isthmus



# Initial marginal adaptation is best for the following materials:
A. Amalgam
B. Acid etched composites
C. Glass ionomers
D. Unfilled resins

# Composites are retained by the phenomenon of:
A. Cohesion
B. True bonding
C. Mechanical interlocking
D. Atomic forces

# Glass fiber reinforced composites is used in all of the following except:
A. Space maintainer
B. Splinting of anterior teeth
C. Obturation of young permanent teeth
D. Used in intra-post cementation of endodontically treated teeth

# Acid etching significantly reduces:
A. Microleakage
B. Setting shrinkage
C. Coefficient of thermal expansion
D. All of the above

# Following the etching of enamel, the pitted surface of enamel without preferential dissolution of either prism or peripheries can be classified as:
A. Type I
B. Type II
C. Type IV
D. Type VI

# Acid etching time of enamel is:
A. 10 seconds
B. 20 seconds
C. 30 seconds
D. 40 seconds

# Average enamel lost by acid etching is:
A. 3-10 microns
B. 10-15 microns
C. 1-5 microns
D. 20-30 microns

# True statement regarding using 50% H3PO4 in acid etching for 45 sec is:
A. Type 1 pattern occur
B. Type 2 pattern occur
C. Type 3 pattern occur
D. Adherent monocalcium PO4 layer

# Acid etched tooth was contaminated with oil from airotor, what should be done?
A. Sterilize the cavity with distilled water, re-etch and then bond
B. Dry and bond the bracket
C. Clean with alcohol and then bond
D. Bond without etching

# When etched dentin is dried using an air syringe, bond strength decreases substantially for:
A. Acetone based adhesive system
B. Water based adhesive system
C. Ethanol based adhesive system
D. Ethanol and acetone based adhesive systems

# Skipping effect is seen in:
A. Use of liquid etchant
B. Use of viscous etchant
C. Use of GIC as pit and fissure sealant
D. Use of composite as pit and fissure sealant

# The purpose of etching the enamel before placing composites:
A. Increases the surface area 2000 times
B. To create surface irregularities to aid in mechanical interlocking
C. Allow proper adaptation and decrease marginal leakage
D. All of the above

# One of the main purposes of etching beveled enamel surface is to:
A. Increase surface energy
B. Produce macro undercut
C. To increase convenience
D. To prevent caries

# How much deep is microporous layer created by etching the enamel (in micrometers)?
A. 0-5
B. 5-50
C. 50-500
D. 500-5000

# Etching of enamel surface with H2(PO4)3, creates a microporous etched surface of 15-25 microns how much of this thickness is contributed by enamel in microns?
A. 1-5
B. 5-10
C. 10-15
D. >15

# Etchant is preferred in gel form than in liquid form due to:
A. Better control over placement
B. Enhance and concentrate the action of acid
C. Helps in visualisation while placement
D. None of the above

# True about dentin conditioner is:
A. Removes smear layer
B. Increases free surface energy of dentin
C. Has low viscosity and bonds easily
D. Forms a layer of resin on dentinal to tooth surface tubules

# A dentin primer:
A. etches the dentin
B. raises the surface-free energy of the dentin
C. removes the smear layer
D. Bonds the composite

# Bonding of the composite restoration to dentin depends on:
A. Acid etching of dentin
B. Functional coupling agents
C. Chemical bonding
D. All of the above

# Why the acid etchant is supplied in gel form?
A. To have better control over flow
B. To get higher concentration of etchant
C. To act more rapidly on enamel
D. To get good taste in patient mouth surface

# Self-etching primers:
A. Simultaneously etch and prime
B. Etch enamel only
C. Only bond to enamel
D. Only remove smear layer

# One bottle system of adhesive resins:
A. 4th generation bonding agents
B. Separate etching step not required
C. Separate etching step is still required
D. Contains only primer

# A dentin bonding agent has both hydrophilic and a hydrophobic end. The hydrophilic end bonds to:
A. Collagen of dentin
B. Calcium of enamel
C. Hydroxyapatite of hard tissues
D. Resinous restorative material

# The minimum thickness of bonding agent applied to prevent O2 penetration should be:
A. 25 microns
B. 50 microns
C. 100 microns
D. 200 microns

# True about self etching primer is:
A. Removes smear layer
B. Does not remove smear layer, but binds it to dentin
C. Increases dentin permeability
D. None of the above

# As compared to total etch adhesives, self etching primers are:
A. More technique sensitive
B. Less technique sensitive
C. Same in sensitivity
D. None of the above

# All of the following are differences between total etch primer and self etch primer except:
A. Bond strength
B. Wetness of dentin
C. Time of application
D. Removal of smear layer

# The term 'Water trees' in adhesive dentistry is associated with:
A. Collapse of collagen fibres
B. Excessive water content in bonding agents
C. Residual water causing porosities in the polymerized adhesion layer
D. Tree shaped defects in etched dentin

# Dentin conditioner has the following functions:
A. Removal of smear layer
B. Increases surface free energy of dentin
C. Forms thin layer between collagen fibrils
D. Bonds with composite

# Increasing the etching concentration:
A. Increases the micropores formed
B. Increases the length of the enamel tags
C. Causes precipitation of phosphates
D. Increases the bond strength

# All of the following are true of composite except:
A. Placed and finished at the same appointment
B. More color stable than unfilled resins
C. Coefficient of thermal expansion close to the tooth structure compared with the unfilled resins
D. Finished surface is less smooth compared to unfilled resins

# A composite has all of the following compared to the unfilled resins except:
A. High strength and abrasive
B. Low thermal conductivity and shrinkage resistance
C. Good marginal integrity
D. Smoother finish than unfilled resins

# Filler used in composites is:
A. Quartz
B. Colloidal silica
C. Aluminium
D. Glass

# Inorganic phase of the composites aids in:
A. Increasing the mechanical strength
B. Decreasing the coefficient of thermal expansion
C. Reducing the polymerization shrinkage
D. All of the above

# Which of the following is not a feature of flowable composites?
A. Syringe forms are available
B. Increase in filler content to increase the flow
C. Easy to flow in pits and fissures
D. All of the above

# Polishable composites are:
A. Conventional composites
B. Hybrid composites
C. Microfill composites
D. Flowable composites

# The principal resin constituent of polishable composite resin is:
A. Polymethyl methacrylate
B. Polycarbonates
C. Urethane dimethacrylate
D. Cyanoacrylates

# During a cavity preparation on the buccal surface of a mandibular canine for a light cure composite material, following step can be skipped:
A. Removal of soft dentin
B. Bevelling the cavosurface margin
C. Pulp capping
D. Acid etching

# Composite restorative treatment is indicated 1 week after cessation of any bleaching due to:
A. Occurrence of external cervical resorption
B. Reoccurrence of surface stains
C. Residual oxygen or peroxide residue interference with bonding
D. Severe sensitivity

# Composites used primarily for class I or class II restorations are termed as __________ composites.
A. Flowable
B. Hybrid
C. Condensable
D. Dual cure

# While halo or line around enamel margin in composite restoration is not due to:
A. Low intensity light curing
B. High intensity light curiing
C. Inadequate etching and bonding
D. Traumatic condition

# C factor is associated with:
A. Condensing force
B. Carving pattern for amalgam
C. Curvature of root
D. Polymerization shrinkage

# The value of C factor for class IV composite restoration is:
A. 0.25
B. 0.5
C. 1.0
D. 2.0

# If the configuration factor (C factor) increases for composites, polymerization shrinkage:
A. Increases
B. Decreases
C. Increases followed by decrease
D. Decreases followed by increase

# Which of the following will not reduce polymerization shrinkage?
A. Incremental addition of composite
B. A stress breaking liner
C. Soft stat polymerization
D. High intensity light curing

# All of the following are true for light curing composite except:
A. Held at distance of greater than 2 mm from tooth
B. Use of orange glass shield for eye protection
C. Curing cycle of 40-60 seconds
D. Adding increments of 1-2 mm

# The minimum output of quartz-tungsten halogen (QTH) curing light should never drop below ________ mW/sq cm.
A. 200
B. 300
C. 400
D. 500

# The camphoroquinone, a photoinitiator used most commonly in the current generation composites, absorbs photons of light energy predominantly of:
A. 300 nm
B. 474 nm
C. 513 nm
D. 624 nm

# For photoinitiated resin system, the optimum depth of cure is obtained with the emitting orifice held:
A. Within 4 mm of resin surface
B. Slightly touching resin surface
C. Within 1 mm of resin surface
D. Within 3 mm of resin surface

# Of the light produced by Quartz-Tungsten-Halogen, only a small percentge is suitable for curing composite resin material and most is converted into heat. How much percentage of this light is useful for curing?
A. 0.5 %
B. 5 %
C. 10 %
D. 50 %

# The output of the curing light is monitored with which of the following apparatus?
A. Radiometer
B. Dosimeter
C. Lightometer
D. All of the above

# What is the approximate stress caused by polymerization contraction of composite?
A. 1 MPa
B. 5 MPa
C. 15 MPa
D. 30 MPa

# What will you do, if after etching, class III cavity preparation is contaminated by saliva?
A. Wipe the saliva with cotton and continue to restore
B. Wash with water, dry area and continue restoration
C. Dry the area and re etch before restoring
D. Add excess composite material and cure it

# When using composites with an acid etching technique, the enamel margins should be:
A. Rounded
B. Butted
C. Acute angles
D. Obtuse angles

# The cavosurface angle in conventional cavity preparation on root surfaces:
A. Butt type
B. Bevelled at acute angles
C. Bevelled at obtuse angles
D. Rounded

# Which of the following should be used to clean the operating site before giving composite restorations?
A. Pumice slurry
B. Prophy paste containing glycerine
C. Prophy paste containing fluoride
D. All of the above

# Core build up on a molar tooth should preferably be done with a chemically cured composite as:
A. Light cure resin lacks sufficient strength for a core
B. Core made with a light cure resin would be too opaque and aesthetically unacceptable
C. Core made with a light cure resin would be too brittle and would fracture easily
D. Its lower viscosity allows free flow of resin also around pins and post

# Sensitivity in gingival area of class II light cured composite restoration after 2 months is due to:
A. Improper cavity preparation at gingival margin
B. Curing from occlusal area only
C. Addition of resin in multiple increments
D. Curing from buccal and lingual aspect

# Which of the following is not an appropriate material for composite hand instruments?
A. Stainless steel
B. Teflon
C. Teflon coated metal
D. Non metallic

# When using the acid etch technique to restore a class IV fracture, exposed dentin should first be covered with:
A. Varnish
B. Calcium hydroxide
C. Phosphoric acid
D. ZOE cements

# Which of the following bases are contraindicated under a composite resin restoration?
A. Calcium hydroxide
B. Eugenol base
C. Zinc phosphate cement
D. None of the above

# It is better to select the shade of the composite:
A. Under a bright light when the teeth are dry
B. Under a bright normal sunlight in the mouth when teeth are wet
C. Under a bright sunlight using a shade guide
D. Under a bright light after placing the rubber dam

# Shade determination of composite resin restoration on a tooth should be done:
A. Before placement of rubber dam
B. On a dry tooth
C. Under bright light
D. Using a dry shade guide

# Shade selection for composite restoration in anterior teeth should be done:
A. After end of etching
B. After prolonged drying
C. Before prolonged drying
D. After applying bonding agent

# Two adjacent cavities which involve contact point can be restored by the composite in one appointment for all the reasons except:
A. Easy selection of the shade
B. Conservation of operating time
C. Access to cavities is simplified
D. Restoration of contact points is made easy

# An old composite restoration is to be replaced. The best method is:
A. To remove entire restoration, re-etch and refill
B. To roughen the old restoration, re-etch and refill
C. Composite restoration cannot be refilled
D. None of the above

# In amalgam restoration as age advances microleakage reduces; in composite and gold restorations, it:
A. Decreases
B. Increases
C. Remains constant
D. First increases and then decreases

# A rough finish is obtained by:
A. Conventional composites
B. Microfilled composites
C. Hybrid composites
D. All of them equally

# The composite that exhibits good flexure and is restoration of choice in class V cavities:
A. Microfilled
B. Hybrid
C. Conventional
D. None of the above

# Glazing resins used on the surface of thw polymerized composites:
A. Seals the margins and smoothens the surface
B. Increase the refractive index and smoothness
C. Seals the margins and increases the refractive index
D. All of the above

# Placing the composites by syringe technique:
A. Increases the strength and abrasive resistance
B. Increases the smoothness
C. Decreases air voids in the restoration
D. Conserves the material

# Crazing, cracking and wear fractures of the composites is due to:
A. Low modulus of resiliency
B. High modulus of elasticity
C. Low surface hardness
D. Low setting shrinkage

# Composites used as dental sealant are composed of:
A. Glass ionomers
B. Methylmethacrylate
C. Bis-GMA
D. EBA resins

# The packable composites are based on which of the principles?
A. Polymer rigid inorganic matrix material concept
B. Spiroorthocarbonate concept
C. Low filler flowable concept
D. All of the above

# The expanding matrix resin composite contains which of the following components?
A. Spiro-orthocarbonates (SOC)
B. Epoxy resins
C. Both of the above
D. None of the above

# The penetration of the fissure sealant into the fissure:
A. is not influenced by the wettability of the enamel
B. is independent of the chemical composition of the enamel
C. is the result of a chemical bond between the sealant and enamel
D. Must occur before the polymerization of the material

# The chief advantage of the composites compared to the silicates:
A. Practically insoluble in oral fluids
B. Color matching with the tooth structure is excellent
C. High modulus of resiliency
D. Coefficient of thermal expansion close to the tooth structure

# Which one of the following restorative materials is recommended for root surface caries?
A. GIC
B. Composites
C. Direct filling gold
D. Amalgam

# Which of the material of choice to be given in class V cavities?
A. Silicate cement
B. Polycarboxylate cement
C. Glass ionomer cement
D. Unfilled resin

# The advantage of glass ionomer cement reinforced with metal particles is:
A. Decreased strength but biocompatibility
B. Increased resistance to abrasion
C. Better color
D. Ease of manipulation

# Bonding of GIC to tooth structure is by:
A. Metal ions
B. OH ions
C. COO ions/Carboxylic groups
D. Micromechanical bonding

# In a cavity to be restored with GIC, it should be conditioned with:
A. Water
B. Polyacrylic acid
C. Phosphoric acid
D. Hydrochloric acid

# Fluoride released from GIC restoration is replaced by:
A. Hydroxyl ion
B. Aluminuium ion
C. Silicate ion
D. Carboxylate ion

# High viscosity GIC was introduced in which year?
A. 1970
B. 1980
C. 2000
D. 1990

# Type of glass ionomer cement (GIC) used in ART?
A. Type I
B. Type II
C. Type III
D. Type IV

# Ideal material for restoration of non carious class V cavities in unstable acid erosion cases is:
A. Glass ionomer cement
B. Resin modified glass ionomer cement
C. Compomer
D. Composite

# Which of the following is recommended to restore acid eroded non carious lesion?
A. Acid etch composite
B. GIC
C. Resin modified GIC
D. Compomer

# Role of itaconic acid copolymer in glass ionomer cement:
A. Reduces the viscosity of the liquid and inhibits gelation
B. Increases the viscosity of the liquid and accelerates gelation
C. Increases cohesion
D. To provide radiolucency

# Giomers are based on which of the following technology?
A. Prereacted glass ionomer technology
B. PRIM concept
C. Expandable resin concept
D. All of the above

# Compomers are also termed as:
A. Antibacterial composites
B. Polyacid modified composite resin
C. Giomers
D. ART GIC

# Silicate cement is indicated in:
A. Mouth breathers
B. Patients with high caries index
C. Restoration of posterior teeth
D. None of the above

# Cement that possesses equal radiolucency as dentin:
A. Ca(OH)2
B. Silicophosphate
C. Zinc oxide eugenol
D. Zinc phosphate

# Resin modified glass ionomer is designed to:
A. Provide rapid setting to minimize cement acidity allowing early finishing
B. Reduce the rate of fluoride release
C. Reduce the cost of the product
D. Change the translucency of the product

# Overall or cumulative fluoride release is least with:
A. Cermet
B. Cerment
C. Compomer
D. Conventional GIC

# Cervical restorations fail mostly due to:
A. Inadequate moisture control
B. Marginal gingivitis
C. Cuspal flexure
D. All of the above

# Which is not a property of resin ionomer restorative material?
A. It is a dual cure polymerization
B. It is radiolucent system
C. It releases fluoride
D. It adheres to the dentin

# The cement which is least soluble in oral cavity:
A. Glass ionomer
B. Resin cement
C. Polycarboxylate cement
D. Silico-phosphate cement

# High viscosity glass ionomer cement are useful in:
A. Filling class I cavities instead of amalgam
B. Orthodontic purposes
C. Pit and fissure sealant
D. Core build up

# Which of the following are used in sandwich technique?
A. Glass ionomer sandwiched between composite and tooth structure
B. Polycarboxylate and glass ionomer when used as enamel and dentin replacement
C. RMGI is sandwiched between the conventional GIC and composite
D. Cerment and cermet are admixed under the composite