MCQs in Operative Dentistry - Dental Cements

 

# The preferred agent for base formation below restorative resin is:
A. Calcium hydroxide
B. Cavity varnish
C. Zinc oxide-eugenol cement
D. None of the above

# Dentin protection during cavity restoration is most important when the "remaining dentin thickness" is:
A. 1 - 2mm
B. 1.5 mm
C. 0.5 - 1mm
D. 0.5 mm

# Cavity varnish is indicated under amalgam restorations to:
A. Prevent galvanic currents from reaching the pulp
B. Improve the marginal seal of the restorations
C. Seal the dentinal tubules completely
D. Act as an effective thermal insulator




# Calcium hydroxide is preferred to ZOE fillings below a composite resin restoration as:
A. Calcium hydroxide forms a calcific bridge
B. Eugenol irritates the inflamed pulp
C. Eugenol interferes with the setting of composite resins
D. None of the above

# When using the acid etch technique to restore a Class IV fracture, exposed dentin should first be covered with:
A. Cavity varnish
B. Phosphoric acid
C. A calcium hydroxide liner
D. Zinc oxide-eugenol cement

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

# Cements in dentistry can be used as:
A. Liners
B. Bases
C. RC fillers
D. All of the above

# Cavity varnish is used for:
A. To reduce thermal conductivity
B. To reduce the permeability of acid into dentinal tubules
C. Action as an obtundant
D. All of the above

# Amount of gap required for cement in restoration is:
A. 10-25 microns
B. 2 microns
C. 50-100 microns
D. No gap required

# Copal varnish is:
A. ZnO resin
B. Ca(OH)2
C. ZnO glycerin
D. All of the above

# Amalgam often tends to discolor the teeth. This can be inhibited by using:
A. A zinc free alloy
B. An alloy containing zinc
C. Calcium hydroxide on the pulpal floor
D. Cavity varnish on all cut surfaces

# Fluoride rich materials include:
A. Silicate cement
B. Glass ionomer cement
C. Polycarboxylate cement
D. All of the above

# Glass ionomer cements are composed of:
A. Alumino silicate powder and phosphoric acid
B. Alumino silicate powder and polyacrylate liquid
C. Zinc oxide powder and phosphoric acid
D. Zinc oxide powder and polyacrylate liquid

# Which one of the following dental cement accelerates the formation of reparative dentin?
A. Eugenol
B. Calcium hydroxide
C. Zinc oxide
D. Silica

# Minimum thickness for type-I zinc phosphate cement should be:
A. 15 microns
B. 25 microns
C. 50 microns
D. 100 microns

# Increased amount of powder in zinc phosphate cement mixture will cause:
A. Decreased strength
B. Decreased film thickness
C. Decreased solubility
D. Increased setting time

# Which of the following is common to both zinc eugenol cement and polycarboxylate cement?
A. Polyacrylic acid is liquid
B. Chemical bond to tooth structure
C. Chelation
D. Substitution of eugenol by EBA to increase strength of cement

# The addition of which of the following can accelerate the setting time of zinc oxide cement:
A. Zinc acetate
B. Barium sulphate
C. Zinc sulphate
D. Barium chloride

# Which of the following show chemical bond with enamel:
A. Composites
B. Direct filling resins
C. Polycarboxylate cements
D. BIS-GMA resins in pit and fissure sealants

# Which of the following cements is pulpal tissues?
A. Zinc phosphate
B. Silicate
C. Glass ionomer
D. Polycarboxylate

# Which of the following do polycarboxylate and GIC have in common?
A. Polysiloxane
B. Phosphoric acid
C. Polyacrylic acid
D. Ion leachable glass

# pH of polycarboxylate liquid is:
A. 5
B. 7
C. 8
D. 1.7

# Which is the cement with adhesive properties?
A. Zinc oxide eugenol
B. Zinc polycarboxylate
C. Silicate
D. Zinc phosphate

# Eugenol may be replaced in the zinc oxide eugenol cement by:
A. Acetic acid
B. Alginic acid
C. Phosphoric acid
D. Ortho-ethoxy acid

# The setting time of zinc phosphate may be retarded by:
A. Increase in the ratio of powder to liquid
B. Diluting the liquid with water
C. Increase the addition of powder to liquid
D. Decrease the addition of powder to liquid

# Thermal conductivity of which material is close to dentin:
A. Amalgam
B. Silicate
C. Composite resin
D. Cavity varnish

# The logical explanation for the unique anticariogenic property of most silicate cements is:
A. The reduction in enamel solubility due to fluoride uptake by enamel
B. That beryllium flux is used in silicates
C. That silicates show very little leakage at the margins of the restoration
D. Due to the high silica content

# Pulpal medication and thermal protection is given by:
A. Solution liners (2-5μm)
B. Suspension liners (25-30μm)
C. Traditional Liner (0.2-0.3 mm)
D. Cement bases

# Glass ionomer cement is composed of:
A. Zinc oxide powder and polycarboxylic liquid
B. Zinc oxide powder and phosphoric acid
C. Aluminia silicate powder and polcarboxylic liquid
D. Aluminia silicate powder and phosphoric acid

# Which of the following cements is most biocompatible with pulp?
A. GIC
B. Copper cement
C. Zinc phosphate cement
D. Zinc oxide eugenol cement

# The major component of zinc phosphate cement is:
A. Zinc oxide
B. Phosphoric acid
C. Zinc
D. None of the above

# Which of the following cements is most kind to pulp?
A. Glass ionomer
B. Polycarboxylate
C. Silicate
D. Resin cement

# Polycarboxylate cement is used for:
A. Temporary restoration
B. Luting
C. Permanent restoration
D. Die material

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

# Stages of setting of GIC are:
A. Decomposition, migration, post set hardening, maturation.
B. Migration, decomposition, maturation, post set hardening
C. Decomposition, post set hardening, migration, maturation
D. Decomposition, post set hardening, migration, maturation

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

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

# If hypersensitivity develops in a glass ionomer filled tooth, indicated treatment:
A. Extraction
B. Remove the restoration and place a sedative dressing
C. Remove the restoration perform pulpectomy
D. No treatment is necessary

# The 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

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

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

# Initial best sealing of margins is done best by:
A. GIC
B. Acid etched composite
C. Amalgam
D. Polycarboxylate

# Sandwich technique consists of:
A. GIC and composite
B. Amalgam and GIC
C. Amalgam and composite
D. None of the above

# 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 products

# After 24 hrs. of setting tensile stength of GIC is:
A. Equal to ZnPO4
B. Greater to ZnPO4
C. Lesser to ZnPO4
D. None of the above

# Bond found in GIC is:
A. Covalent bond
B. Ionic bond
C. Hydrogen bond
D. Metallic bond

# Calcium Hydroxide is used in deep cavities in order to:
A. Form dentin bridge
B. To kill microorganism
C. To cause necrosis
D. As a base under restoration

# Deep caries ( less than 2 mm of dentine remaining) management with resin composite restoration would include:
A. Calcium hydroxide
B. Glass-ionomer cement
C. Dentine bonding agent
D. All of the above

# Vitremer is:
A. Resin modified GIC
B. Metal modified GIC
C. Organically modified composite
D. Polyacid modified composite

# High Viscosity GIC was discovered in:
A. 1970
B. 1980
C. 1990
D. 2000

# Atraumatic Restorative Treatment (ART) technique utilises:
A. Glass ionomer cement
B. Composite resin
C. Silver amalgam
D. Reinforced zinc oxide eugenol cement

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