tooth colored restorations

B. Composite resin

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

B. Composite resin

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

C. Occlusal wear

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

B. Acid etched composites

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

C. Mechanical interlocking

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

C. Obturation of young permanent teeth

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

A. Microleakage

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

C. Type IV

# 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

B. 20 seconds

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

A. 3-10 microns

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

D. Adherent monocalcium PO4 layer

# 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

D. Ethanol and acetone based adhesive systems

# 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

B. Use of viscous etchant

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

A. Removes smear layer

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

B. raises the surface-free energy of the dentin

# 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

B. Functional coupling agents

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

A. Collagen of dentin

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

50 microns

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

B. More color stable than unfilled resins

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

D. Smoother finish than 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

B. Colloidal silica

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

D. All of the above

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

Increase in filler content to increase the flow

# 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

Microfill composites

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

B. Bevelling the cavosurface margin

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

Residual oxygen or peroxide residue interference with bonding

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

A. Butt type

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

C. Dry the area and re etch before restoring

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

D. Obtuse angles

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

A. Improper cavity preparation at gingival margin

# 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

D. Its lower viscosity allows free flow of resin also around pins and post

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

B. Eugenol base

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

A. Before placement of 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

Before prolonged drying

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

D. Restoration of contact points is made easy

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

B. To roughen the old restoration, re-etch and refill

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

C. Glass ionomer cement

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

B. Increased resistance to abrasion

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

C. COO ions/Carboxylic groups

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

B. Polyacrylic acid

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

A. Hydroxyl ion

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

B. Type II

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

D. Composite

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

C. Resin modified GIC

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

A. Provide rapid setting to minimize cement acidity allowing early finishing

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

A. Glass ionomer sandwiched between composite and tooth structure

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

B. Resin cement

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