A. Silicate cement
B. Glass ionomer cement
C. Poly carboxylate cement
D. All of the above
# Glass ionomer cements are composed of:
A. Alumina silicate powder and phosphoric acid
B. Aluminosilicate powder and polyacrylate
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
# The temperature (in ° F) of the mixing slab for silicate cements should be:
A. 55 - 65
B. 65 - 75
C. 75 - 85
D. 85 - 95
# 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 (Calcified tissues)?
A. Composites
B. Direct filling resins
C. Polycarboxylate cements
D. BIS-GMA resins in pit and fissure sealants
# Which of the following cements is most irritant to 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? (TWO ANSWERS CORRECT)
A. Zinc oxide eugenol
B. Zinc polycarboxylate
C. Silicate
D. Glass ionomer
# When selecting the colour of cement to use for cementing a porcelain jacket crown, the powder being tested is best mixed with:
A. Glycerin-water solution
B. Cement liquid
C. Alcohol
D. Only water
# 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
# pH of fully set zinc phosphate:
A. 3-4
B. 4-5
C. 6-7
D. 7-8
# 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
# Thickness of luting cement is:
A. 20-40 μ
B. 10-20 μ
C. 60-80 μ
D. 1-2 μ
# The two cements which hold with the tooth are:
A. GIC and polycairboxylate
B. GIC and ZnP04
C. ZnP04 and silicate
D. GIC and silicate
# The chief advantage of zinc phosphate cement is its:
A. Good compressive strength
B. Film thickness
C. Lack of irritation
D. Low solubility
# All of the following is used as accelerator in zinc oxide eugenol cement except:
A. Acetic acid
B. Zinc acetate dehydrate
C. Calcium chloride
D. Bromoglycerine
# Which of the following cements is most biocompatible with pulp?
A. GIC
B. Copper cement
C. Zinc phosphate cement
D. Zinc oxide eugenol cement
# What is the working time of zinc polyacrylate cement?
A. 1 minutes
B. 2 minutes
C. 3 minutes
D. 4 minutes
# 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
# The dual cure cements should not be used with light transmitting prostheses thicker than:
A. 1.0 mm
B. 1.5 mm
C. 2.0 mm
D. 2.5 mm
# 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 is most important in strength of ZOE:
A. Liquid powder ratio
B. Temperature of mixing slab
C. Speed of mixing
D. Addition of few drops of water
# Which cement is irritating to the pulp?
A. Carboxylate cement
B. Zinc oxide-eugenol cement
C. Zinc phosphate
D. Ethoxybenzoic acid
# The effect of zinc oxide-eugenol on the pulp?
A. Is irritating
B. Encourages pulpal fibrosis
C. Is sedating
D. Has no effect
# Which component of zinc oxide-eugenol cement gives its strength?
A. Rosin
B. Zinc oxide
C. Zinc acetate
D. Oil of cloves
# Which of the following is the most soluble cement?
A. ZOE
B. Zinc phosphate
C. Silicophosphate
D. Polycarboxylate
# The main components in silicophosphate cement:
A. Zinc phosphate and GIC
B. Silicate and GIC
C. ZOE and Silicate
D. Zinc phosphate and Silicate
# Secondary caries is least likely seen with:
A. Silicate cement
B. Zinc phosphate
C. Polycarboxylate
D. GIC
# Percentage of zinc in ZOE cement is:
A. 60%
B. 70%
C. 80%
D. 90%
# Most preferable cement for temporary restoration:
A. GIC
B. ZOE
C. Ca (OH)2
D. Zinc polycarboxylate cement
# Which of the following cements is contraindicated in mouth breathers?
A. Silicate
B. ASPA
C. Polycarboxylate
D. Zinc phosphate
# Why is GIC best restorative material in children?
A. High strength
B. Good marginal integrity
C. It can bond to both enamel and dentin
D. It has less occlusal wear
# The principal application of zinc phosphate cement is:
A. In final cementation
B. In temporary cementation
C. As a temporary filling material
D. It has less occlusal wear
# The setting of zinc phosphate is accelerated by:
A. Adding a drop of water
B. Increasing mixing time
C. Cooling the slab
D. Adding a drop of oleic acid
# Which of the following cements have anti cariogenic property?
A. ZOE
B. Calcium Hydroxide
C. Zinc silicophosphate
D. Zinc phosphate
# pH of which cement remains below 7 even after 1 month after insertion into the cavity?
A. Glass Ionomer Cement
B. Zinc phosphate
C. Resin cement
D. Silicate cement
# Which of the following characterizes the silicate cement?
A. It is pulpal irritant
B. It is highly cariogenic
C. Chemically attaches to the tooth structure
D. It produces thinnest film surface
# The most commonly used, most biocompatible and adhesive cement is:
A. Zinc phosphate
B. Zinc oxide eugenol
C. Calcium hydroxide
D. Glass ionomer
# Which of the following cements bonds to tooth structure, which has an anticariogenic effect, has a degree of translucency and does not irritate the pulp?
A. Polycarboxylate cement
B. Resin cement
C. Silicate cement
D. Glass ionomer cement
# Torsional force is:
A. Compression
B. Tensile force
C. Shear
D. Transverse bending force
# All of the following are true for traditional solution liner, except:
A. It is not necessary in moderately deep cavities under glass ionomer restoration
B. Have Film thickness of 1 -50 microns
C. Do not provide thermal or electric insulation
D. Protect the pulp from reaction products leaching out of restoration
# All of the following is used as accelerator in zinc oxide eugenol cement except:
A. Acetic acid
B. Zinc acetate dehydrate
C. Calcium chloride
D. Bromoglycerine
# The average life of silicate cement restoration is:
A. 2 years
B. 4 years
C. 6 years
D. 8 years
# The principal constituent of set silicate cement matrix is:
A. Hydrated Aluminium phosphate
B. Hydrated Aluminium phosphate with calcium fluoride
C. Hydrated Aluminosilicate gel
D. Hydrated Aluminium phosphate crystals, CaF2 aluminosilicate gel
# The cavity varnish applied reduces post operative sensitivity in amalgam restoration by:
A. Decreasing conduction of heat to pulp
B. Minimize marginal leakage around restoration
C. By altering the chemical composition of restoration materials
D. By preventing penetration of corrosion products into the dentinal tubules
# Age hardening is a process done at:
A. Heating up to 200 - 450°C for 15 - 30 min and quenching in water
B. Heating at 700°C for 10 - 15 min and quenching in water
C. Heating at 700°C for 1 hour and quenching in water
D. Heating above 700°C for 30 min and quenching in water
# Which cement base has the highest modulus of elasticity?
A. Zinc polycarboxylate
B. Polymer reinforced ZOE cement
C. Zinc phosphate
D. Glass inomer cement
# Frozen slab technique is applicable to:
A. Zinc phosphate cement
B. Glass Ionomer cement
C. Zinc oxide Eugenol cement
D. Resin cement
# Ethoxy benzoic acid increases the strength and solubility of the cement:
A. Zinc oxide eugenol
B. Polycarboxylate cement
C. Zinc phosphate cement
D. Silicate cement
# Which of the following acts as accelerator in Zinc oxide eugenol?
A. ZnCl2 + Eugenol
B. ZnCl2 + ZnSO4
C. Eugenol + ZnO
D. Zn(OH)z + ZnO
# In non-eugenol pastes the constituents are mixed in:
A. Phosphoric Acid
B. Ethyl alcohol
C. Benzoic acid
D. None of the above
# Strength of zinc phosphate is effected by:
A. Temp of glass slab
B. P:L ratio
C. Consistency of mix
D. Alteration of mixing time
# Mechanism of adhesion of GIC restoration with tooth surface is by means of:
A. Carboxyl group
B. Chelates with Metal Ions
C. C=C double bond
D. Polymer Chains
# Frozen slab technique of mixing zinc phosphate is used for:
A. cementing crowns
B. temporary dressing
C. base
D. cementing orthodontic bands
# The setting time of ZnP04 cement can be retarded by:
A. mixing more powder to the liquid
B. mixing powder to liquid, checked by water
C. slower addition of powder to liquid
D. faster addition of powder to liquid
# About zinc oxide eugenol all are true except:
A. ZnO is converted to Zn(OH)2
B. Reaction is autocatalytic
C. Water is the byproduct of reaction
D. Dehydrated ZnO reacts with dehydrated eugenol
# Mode of failure dUring dislodgement of prosthesis cemented with zinc poly carboxylate cement is usually seen at the:
A. Cement tooth interface
B. Cement prosthesis interface
C. Cleavage through the cement layer
D. Fracture of tooth or prosthesis
# Which glass ionomer cement develops early resistance to water intake on setting?
A. Reinforced auto care glass ionomer cement
B. Compomer
C. Resin modified glass ionomer cement
D. Ceramic reinforced glass ionomer cement
# Which one of the following restorative materials is having coefficient of thermal expansion close to that of tooth enamel and dentin?
A. Microfilled composite resins
B. Pure gold
C. Silver amalgam
D. Type II Glass ionomer cement
# Which one of the following dental cements does not contain water as part of the composition of the liquid component?
A. Zinc phosphate cement
B. Zinc oxide eugenol cement
C. Zinc silicophosphate cement
D. Zinc polycarboxylate cement
# Cavity varnishes have:
A. average bonding to tooth
B. low bonding to tooth
C. excellent bonding to tooth
D. no bonding to tooth
# Advantage of Zinc phosphate over GIC is:
A. High compressive strength
B. Tensile strength
C. High modulus of elasticity
D. Diametral strength
# Restoration commonly recommended for cervical abrasion is:
A. Silicate
B. Poly carboxylate
C. Glass ionomer
D. Composites
# The selection of a pulp protecting agent does not depend on:
A. Remaining dentin thickness
B. Choice of restorative material
C. Symptoms of the patient
D. Stage of tooth development
# ZOE is not used for permanent cementation because of?
A. Less strength
B. High solubility
C. Poor marginal seal
D. Poor pulpal protection
# Which of the following is false about glass ionomer cement?
A. Acid treatment of the tooth surface is required before placement
B. Poor marginal seal
C. Low fracture resistance
D. Has ability to renew broken ionic bonds
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