B.D.S-B.D.S Dental Surgery 1st Sem DENTAL MATERIALS(Karnatak University, Dharward-2009)

First Year B.D.S. Degree Examination, April 2009

Paper – III : DENTAL MATERIALS

Time : 3 Hours Max. Marks : 100
PART – A
(Restorative Dental Materials)
1
Time : 1 /2 Hours Marks : 50
Essay :
I. Define dental composite. Classify dental composite and write in detail on the
composition of a dental composite. (1+2+7)
II. Types of abrasives used in dentistry. Add a note on the composition of a typical
dentrifice. (6+4)
Short notes : (5×3=15 Marks)

1. Glass ionomer cement – composition, setting reaction, and mechanism of adhesion to tooth.

2. Phosphate bonded investment.

3. Factors affecting strength of dental amalgam.

Multiple Choice Questions : (15×1=15 Marks)
1. Eutectic alloy temperature is
a) 649° C b) 779° C
c) 500° C d) 1400° C



P.T.O.


1725 -2- *1725*



2. If the usage test is performed in humans it is called

a) clinical trial

b) level I test

c) level IV test

d) sensitization test

3. Aluwax contains

a) copper

b) silica

c) aluminium

d) zinc oxide

4. In a casting, subsurface porosity can be diminished by controlling the

a) mould temperature

b) sprue length

c) melt temperature

d) rate at which the molten metal enters the mould

5. Procedure which is used to shape the abrasive instruments as well as to remove clogged debris from the instrument

a) truing

b) dressing

c) sintering

d) buffing


*1725* -3- 1725



6. Sandwich technique of restoration uses

a) amalgam and glass ionomer

b) polycarboxylate and glass ionomer

c) composite and glass ionomer

d) only composite

7. Radiant energy required for maximum curing of a 2 mm thick layer of resin is

a) 16 milli joules / cm2
b) 16,000 milli joules / cm2
c) 1600 milli joules / cm2
d) 160,000 milli joules / cm2

8. Enamel bonding agents are used

a) to enhance the wettability of etched enamel

b) to increase the adhesion of composite to enamel

c) to increase the tag length

d) to improve chemical bonding

9. Setting time of zinc phosphate cement can be retarded by

a) diluting the liquid with small amounts of H2O

b) accelerating the rate of addition of powder to liquid

c) increasing the ratio of powder to liquid

d) decreasing the rate of addition of powder to liquid

10. Cavity varnish is a material which

a) develops an impermeable resin film

b) develops semipermeable membrane of resin film

c) is a calcium hydroxide powder in an aqueous medium

d) is a eugenol solution in an organic solvent


1725 -4- *1725*



11. E-Z gold is a type of

a) gold foil

b) crystalline gold

c) powdered gold

d) fibrous gold

12. 24 hour compressive strength is highest for

a) zinc phosphate cement

b) GIC

c) polycarboxylate cement

d) zinc-oxide eugenol cement

13. Material having coefficient of thermal expansion similar to that of the tooth enamel

a) composite

b) amalgam

c) type II GIC

d) direct filling gold

14. Strength in gypsum investment is provided by

a) quartz

b) dental stone

c) silica

d) tridymite and cristoballite together

15. Component of inlay wax that contributes more to the glossiness of the wax surface is

a) paraffin wax

b) gum dammar

c) carnauba wax

d) candelilla wax


*1725* -5- 1725
PART – B
(Prosthodontics)
1
Time : 1 /2 Hours Marks : 50
I. Define soldering and welding. Enumerate the desirable qualities of an ideal solder.
Write in detail about investment soldering and free hand soldering techniques. 10

II. Write the composition and setting reaction of irreversible hydrocolloid impression material. Give the causes and remedies for different types of failure encountered
with the use of irreversible hydrocolloid impression material. 10
III. Write short notes on : 15
a) Viscosity.
b) Galvanic corrosion.
c) Separating medium.
IV. Multiple Choice Questions : 15

1) Increasing the Water-Powder ratio of dental stone would

a) Increase the setting expansion

b) Increase the 1-Hr compressive strength

c) Lengthen the setting time

d) Decrease the amount of excess water used to mix the material

2) The setting time of zinc oxide eugenol impression paste can be prolonged by

a) Mixing for a longer time

b) Adding chemical modifier, zinc acetate

c) Decreasing the amount of base paste

d) Cooling the glass slab and spatula not below the dew point


1725 -6- *1725*



3) The main purpose of adding butadiene styrene rubber to acrylic resin is to increase its

a) Impact strength

b) Compressive strength

c) Tensile strength

d) Shear strength

4) Cristobalite is a high expansion form of
a) SiO2 b) Al2O3 c) K2O d) Na2O

5) The yield stress of metals can be improved by

a) Chemical tempering

b) Transformation toughening

c) Thermal tempering

d) Work hardening

6) Crazing of dentures occurs as a result of

a) Relaxation of internal surface stresses

b) Lack of conduction of heat from inside to outside

c) Lack of adequate pressure

d) Leaching out of the plasticizer

7) Agar hydrocolloid gel should be liquefied by heating at

a) 37° C b) 45° C c) 65° C d) 100° C
8) The boiling point of methyl methacrylate monomer is
a) 100.8° C b) 180.1° C c) 108.0° C d) 108.8° C

9) Hardness of which of the following abrasives is maximum ?

a) Sand b) Emery
c) Boron carbide d) Silicon carbide


*1725* -7- 1725



10) What is a wrought metal ?

a) When metal is worked in cold state

b) When metal is heated and then cooled

c) When copper is added to a metal

d) When more than two metals are mixed in molten state

11) Siliconized alginates have better

a) Impact strength b) Transverse strength

c) Tear strength d) Fatigue strength

12) Phenol and formaldehyde are polymerized to a resultant product known as

a) Vulcanite b) Bakelite

c) Cryolite d) Cellulose nitrate

13) In which of the following hardness tests, hardness is measured as the depth of penetration

a) Brinell b) Rockwell
c) Vickers d) Knoop

14) The binder used in gypsum bonded investments is

a) Sodium phosphate

b) Ethyl silicate

c) Calcium sulfate alpha hemihydrateFirst Year B.D.S. Degree Examination, April 2009

Paper – III : DENTAL MATERIALS

Time : 3 Hours Max. Marks : 100
PART – A
(Restorative Dental Materials)
1
Time : 1 /2 Hours Marks : 50
Essay :
I. Define dental composite. Classify dental composite and write in detail on the
composition of a dental composite. (1+2+7)
II. Types of abrasives used in dentistry. Add a note on the composition of a typical
dentrifice. (6+4)
Short notes : (5×3=15 Marks)

1. Glass ionomer cement – composition, setting reaction, and mechanism of adhesion to tooth.

2. Phosphate bonded investment.

3. Factors affecting strength of dental amalgam.

Multiple Choice Questions : (15×1=15 Marks)
1. Eutectic alloy temperature is
a) 649° C b) 779° C
c) 500° C d) 1400° C



P.T.O.


1725 -2- *1725*



2. If the usage test is performed in humans it is called

a) clinical trial

b) level I test

c) level IV test

d) sensitization test

3. Aluwax contains

a) copper

b) silica

c) aluminium

d) zinc oxide

4. In a casting, subsurface porosity can be diminished by controlling the

a) mould temperature

b) sprue length

c) melt temperature

d) rate at which the molten metal enters the mould

5. Procedure which is used to shape the abrasive instruments as well as to remove clogged debris from the instrument

a) truing

b) dressing

c) sintering

d) buffing


*1725* -3- 1725



6. Sandwich technique of restoration uses

a) amalgam and glass ionomer

b) polycarboxylate and glass ionomer

c) composite and glass ionomer

d) only composite

7. Radiant energy required for maximum curing of a 2 mm thick layer of resin is

a) 16 milli joules / cm2
b) 16,000 milli joules / cm2
c) 1600 milli joules / cm2
d) 160,000 milli joules / cm2

8. Enamel bonding agents are used

a) to enhance the wettability of etched enamel

b) to increase the adhesion of composite to enamel

c) to increase the tag length

d) to improve chemical bonding

9. Setting time of zinc phosphate cement can be retarded by

a) diluting the liquid with small amounts of H2O

b) accelerating the rate of addition of powder to liquid

c) increasing the ratio of powder to liquid

d) decreasing the rate of addition of powder to liquid

10. Cavity varnish is a material which

a) develops an impermeable resin film

b) develops semipermeable membrane of resin film

c) is a calcium hydroxide powder in an aqueous medium

d) is a eugenol solution in an organic solvent


1725 -4- *1725*



11. E-Z gold is a type of

a) gold foil

b) crystalline gold

c) powdered gold

d) fibrous gold

12. 24 hour compressive strength is highest for

a) zinc phosphate cement

b) GIC

c) polycarboxylate cement

d) zinc-oxide eugenol cement

13. Material having coefficient of thermal expansion similar to that of the tooth enamel

a) composite

b) amalgam

c) type II GIC

d) direct filling gold

14. Strength in gypsum investment is provided by

a) quartz

b) dental stone

c) silica

d) tridymite and cristoballite together

15. Component of inlay wax that contributes more to the glossiness of the wax surface is

a) paraffin wax

b) gum dammar

c) carnauba wax

d) candelilla wax


*1725* -5- 1725
PART – B
(Prosthodontics)
1
Time : 1 /2 Hours Marks : 50
I. Define soldering and welding. Enumerate the desirable qualities of an ideal solder.
Write in detail about investment soldering and free hand soldering techniques. 10

II. Write the composition and setting reaction of irreversible hydrocolloid impression material. Give the causes and remedies for different types of failure encountered
with the use of irreversible hydrocolloid impression material. 10
III. Write short notes on : 15
a) Viscosity.
b) Galvanic corrosion.
c) Separating medium.
IV. Multiple Choice Questions : 15

1) Increasing the Water-Powder ratio of dental stone would

a) Increase the setting expansion

b) Increase the 1-Hr compressive strength

c) Lengthen the setting time

d) Decrease the amount of excess water used to mix the material

2) The setting time of zinc oxide eugenol impression paste can be prolonged by

a) Mixing for a longer time

b) Adding chemical modifier, zinc acetate

c) Decreasing the amount of base paste

d) Cooling the glass slab and spatula not below the dew point


1725 -6- *1725*



3) The main purpose of adding butadiene styrene rubber to acrylic resin is to increase its

a) Impact strength

b) Compressive strength

c) Tensile strength

d) Shear strength

4) Cristobalite is a high expansion form of
a) SiO2 b) Al2O3 c) K2O d) Na2O

5) The yield stress of metals can be improved by

a) Chemical tempering

b) Transformation toughening

c) Thermal tempering

d) Work hardening

6) Crazing of dentures occurs as a result of

a) Relaxation of internal surface stresses

b) Lack of conduction of heat from inside to outside

c) Lack of adequate pressure

d) Leaching out of the plasticizer

7) Agar hydrocolloid gel should be liquefied by heating at

a) 37° C b) 45° C c) 65° C d) 100° C
8) The boiling point of methyl methacrylate monomer is
a) 100.8° C b) 180.1° C c) 108.0° C d) 108.8° C

9) Hardness of which of the following abrasives is maximum ?

a) Sand b) Emery
c) Boron carbide d) Silicon carbide


*1725* -7- 1725



10) What is a wrought metal ?

a) When metal is worked in cold state

b) When metal is heated and then cooled

c) When copper is added to a metal

d) When more than two metals are mixed in molten state

11) Siliconized alginates have better

a) Impact strength b) Transverse strength

c) Tear strength d) Fatigue strength

12) Phenol and formaldehyde are polymerized to a resultant product known as

a) Vulcanite b) Bakelite

c) Cryolite d) Cellulose nitrate

13) In which of the following hardness tests, hardness is measured as the depth of penetration

a) Brinell b) Rockwell
c) Vickers d) Knoop

14) The binder used in gypsum bonded investments is

a) Sodium phosphate

b) Ethyl silicate

c) Calcium sulfate alpha hemihydrate

d) Ammonium phosphate

15) Hardness of elastomers is measured by using

a) Oscillating rheometer

b) Shore a durometer

c) Vicat penetrometer

d) Gillmore needle 

First Year B.D.S. Degree Examination, April 2009

Paper – III : DENTAL MATERIALS

Time : 3 Hours Max. Marks : 100
PART – A
(Restorative Dental Materials)
1
Time : 1 /2 Hours Marks : 50
Essay :
I. Define dental composite. Classify dental composite and write in detail on the
composition of a dental composite. (1+2+7)
II. Types of abrasives used in dentistry. Add a note on the composition of a typical
dentrifice. (6+4)
Short notes : (5×3=15 Marks)

1. Glass ionomer cement – composition, setting reaction, and mechanism of adhesion to tooth.

2. Phosphate bonded investment.

3. Factors affecting strength of dental amalgam.

Multiple Choice Questions : (15×1=15 Marks)
1. Eutectic alloy temperature is
a) 649° C b) 779° C
c) 500° C d) 1400° C



P.T.O.


1725 -2- *1725*



2. If the usage test is performed in humans it is called

a) clinical trial

b) level I test

c) level IV test

d) sensitization test

3. Aluwax contains

a) copper

b) silica

c) aluminium

d) zinc oxide

4. In a casting, subsurface porosity can be diminished by controlling the

a) mould temperature

b) sprue length

c) melt temperature

d) rate at which the molten metal enters the mould

5. Procedure which is used to shape the abrasive instruments as well as to remove clogged debris from the instrument

a) truing

b) dressing

c) sintering

d) buffing


*1725* -3- 1725



6. Sandwich technique of restoration uses

a) amalgam and glass ionomer

b) polycarboxylate and glass ionomer

c) composite and glass ionomer

d) only composite

7. Radiant energy required for maximum curing of a 2 mm thick layer of resin is

a) 16 milli joules / cm2
b) 16,000 milli joules / cm2
c) 1600 milli joules / cm2
d) 160,000 milli joules / cm2

8. Enamel bonding agents are used

a) to enhance the wettability of etched enamel

b) to increase the adhesion of composite to enamel

c) to increase the tag length

d) to improve chemical bonding

9. Setting time of zinc phosphate cement can be retarded by

a) diluting the liquid with small amounts of H2O

b) accelerating the rate of addition of powder to liquid

c) increasing the ratio of powder to liquid

d) decreasing the rate of addition of powder to liquid

10. Cavity varnish is a material which

a) develops an impermeable resin film

b) develops semipermeable membrane of resin film

c) is a calcium hydroxide powder in an aqueous medium

d) is a eugenol solution in an organic solvent


1725 -4- *1725*



11. E-Z gold is a type of

a) gold foil

b) crystalline gold

c) powdered gold

d) fibrous gold

12. 24 hour compressive strength is highest for

a) zinc phosphate cement

b) GIC

c) polycarboxylate cement

d) zinc-oxide eugenol cement

13. Material having coefficient of thermal expansion similar to that of the tooth enamel

a) composite

b) amalgam

c) type II GIC

d) direct filling gold

14. Strength in gypsum investment is provided by

a) quartz

b) dental stone

c) silica

d) tridymite and cristoballite together

15. Component of inlay wax that contributes more to the glossiness of the wax surface is

a) paraffin wax

b) gum dammar

c) carnauba wax

d) candelilla wax


*1725* -5- 1725
PART – B
(Prosthodontics)
1
Time : 1 /2 Hours Marks : 50
I. Define soldering and welding. Enumerate the desirable qualities of an ideal solder.
Write in detail about investment soldering and free hand soldering techniques. 10

II. Write the composition and setting reaction of irreversible hydrocolloid impression material. Give the causes and remedies for different types of failure encountered
with the use of irreversible hydrocolloid impression material. 10
III. Write short notes on : 15
a) Viscosity.
b) Galvanic corrosion.
c) Separating medium.
IV. Multiple Choice Questions : 15

1) Increasing the Water-Powder ratio of dental stone would

a) Increase the setting expansion

b) Increase the 1-Hr compressive strength

c) Lengthen the setting time

d) Decrease the amount of excess water used to mix the material

2) The setting time of zinc oxide eugenol impression paste can be prolonged by

a) Mixing for a longer time

b) Adding chemical modifier, zinc acetate

c) Decreasing the amount of base paste

d) Cooling the glass slab and spatula not below the dew point


1725 -6- *1725*



3) The main purpose of adding butadiene styrene rubber to acrylic resin is to increase its

a) Impact strength

b) Compressive strength

c) Tensile strength

d) Shear strength

4) Cristobalite is a high expansion form of
a) SiO2 b) Al2O3 c) K2O d) Na2O

5) The yield stress of metals can be improved by

a) Chemical tempering

b) Transformation toughening

c) Thermal tempering

d) Work hardening

6) Crazing of dentures occurs as a result of

a) Relaxation of internal surface stresses

b) Lack of conduction of heat from inside to outside

c) Lack of adequate pressure

d) Leaching out of the plasticizer

7) Agar hydrocolloid gel should be liquefied by heating at

a) 37° C b) 45° C c) 65° C d) 100° C
8) The boiling point of methyl methacrylate monomer is
a) 100.8° C b) 180.1° C c) 108.0° C d) 108.8° C

9) Hardness of which of the following abrasives is maximum ?

a) Sand b) Emery
c) Boron carbide d) Silicon carbide


*1725* -7- 1725



10) What is a wrought metal ?

a) When metal is worked in cold state

b) When metal is heated and then cooled

c) When copper is added to a metal

d) When more than two metals are mixed in molten state

11) Siliconized alginates have better

a) Impact strength b) Transverse strength

c) Tear strength d) Fatigue strength

12) Phenol and formaldehyde are polymerized to a resultant product known as

a) Vulcanite b) Bakelite

c) Cryolite d) Cellulose nitrate

13) In which of the following hardness tests, hardness is measured as the depth of penetration

a) Brinell b) Rockwell
c) Vickers d) Knoop

14) The binder used in gypsum bonded investments is

a) Sodium phosphate

b) Ethyl silicate

c) Calcium sulfate alpha hemihydrate

d) Ammonium phosphate

15) Hardness of elastomers is measured by using

a) Oscillating rheometer

b) Shore a durometer

c) Vicat penetrometer

d) Gillmore needle 

First Year B.D.S. Degree Examination, April 2009

Paper – III : DENTAL MATERIALS

Time : 3 Hours Max. Marks : 100
PART – A
(Restorative Dental Materials)
1
Time : 1 /2 Hours Marks : 50
Essay :
I. Define dental composite. Classify dental composite and write in detail on the
composition of a dental composite. (1+2+7)
II. Types of abrasives used in dentistry. Add a note on the composition of a typical
dentrifice. (6+4)
Short notes : (5×3=15 Marks)

1. Glass ionomer cement – composition, setting reaction, and mechanism of adhesion to tooth.

2. Phosphate bonded investment.

3. Factors affecting strength of dental amalgam.

Multiple Choice Questions : (15×1=15 Marks)
1. Eutectic alloy temperature is
a) 649° C b) 779° C
c) 500° C d) 1400° C



P.T.O.


1725 -2- *1725*



2. If the usage test is performed in humans it is called

a) clinical trial

b) level I test

c) level IV test

d) sensitization test

3. Aluwax contains

a) copper

b) silica

c) aluminium

d) zinc oxide

4. In a casting, subsurface porosity can be diminished by controlling the

a) mould temperature

b) sprue length

c) melt temperature

d) rate at which the molten metal enters the mould

5. Procedure which is used to shape the abrasive instruments as well as to remove clogged debris from the instrument

a) truing

b) dressing

c) sintering

d) buffing


*1725* -3- 1725



6. Sandwich technique of restoration uses

a) amalgam and glass ionomer

b) polycarboxylate and glass ionomer

c) composite and glass ionomer

d) only composite

7. Radiant energy required for maximum curing of a 2 mm thick layer of resin is

a) 16 milli joules / cm2
b) 16,000 milli joules / cm2
c) 1600 milli joules / cm2
d) 160,000 milli joules / cm2

8. Enamel bonding agents are used

a) to enhance the wettability of etched enamel

b) to increase the adhesion of composite to enamel

c) to increase the tag length

d) to improve chemical bonding

9. Setting time of zinc phosphate cement can be retarded by

a) diluting the liquid with small amounts of H2O

b) accelerating the rate of addition of powder to liquid

c) increasing the ratio of powder to liquid

d) decreasing the rate of addition of powder to liquid

10. Cavity varnish is a material which

a) develops an impermeable resin film

b) develops semipermeable membrane of resin film

c) is a calcium hydroxide powder in an aqueous medium

d) is a eugenol solution in an organic solvent


1725 -4- *1725*



11. E-Z gold is a type of

a) gold foil

b) crystalline gold

c) powdered gold

d) fibrous gold

12. 24 hour compressive strength is highest for

a) zinc phosphate cement

b) GIC

c) polycarboxylate cement

d) zinc-oxide eugenol cement

13. Material having coefficient of thermal expansion similar to that of the tooth enamel

a) composite

b) amalgam

c) type II GIC

d) direct filling gold

14. Strength in gypsum investment is provided by

a) quartz

b) dental stone

c) silica

d) tridymite and cristoballite together

15. Component of inlay wax that contributes more to the glossiness of the wax surface is

a) paraffin wax

b) gum dammar

c) carnauba wax

d) candelilla wax


*1725* -5- 1725
PART – B
(Prosthodontics)
1
Time : 1 /2 Hours Marks : 50
I. Define soldering and welding. Enumerate the desirable qualities of an ideal solder.
Write in detail about investment soldering and free hand soldering techniques. 10

II. Write the composition and setting reaction of irreversible hydrocolloid impression material. Give the causes and remedies for different types of failure encountered
with the use of irreversible hydrocolloid impression material. 10
III. Write short notes on : 15
a) Viscosity.
b) Galvanic corrosion.
c) Separating medium.
IV. Multiple Choice Questions : 15

1) Increasing the Water-Powder ratio of dental stone would

a) Increase the setting expansion

b) Increase the 1-Hr compressive strength

c) Lengthen the setting time

d) Decrease the amount of excess water used to mix the material

2) The setting time of zinc oxide eugenol impression paste can be prolonged by

a) Mixing for a longer time

b) Adding chemical modifier, zinc acetate

c) Decreasing the amount of base paste

d) Cooling the glass slab and spatula not below the dew point


1725 -6- *1725*



3) The main purpose of adding butadiene styrene rubber to acrylic resin is to increase its

a) Impact strength

b) Compressive strength

c) Tensile strength

d) Shear strength

4) Cristobalite is a high expansion form of
a) SiO2 b) Al2O3 c) K2O d) Na2O

5) The yield stress of metals can be improved by

a) Chemical tempering

b) Transformation toughening

c) Thermal tempering

d) Work hardening

6) Crazing of dentures occurs as a result of

a) Relaxation of internal surface stresses

b) Lack of conduction of heat from inside to outside

c) Lack of adequate pressure

d) Leaching out of the plasticizer

7) Agar hydrocolloid gel should be liquefied by heating at

a) 37° C b) 45° C c) 65° C d) 100° C
8) The boiling point of methyl methacrylate monomer is
a) 100.8° C b) 180.1° C c) 108.0° C d) 108.8° C

9) Hardness of which of the following abrasives is maximum ?

a) Sand b) Emery
c) Boron carbide d) Silicon carbide


*1725* -7- 1725



10) What is a wrought metal ?

a) When metal is worked in cold state

b) When metal is heated and then cooled

c) When copper is added to a metal

d) When more than two metals are mixed in molten state

11) Siliconized alginates have better

a) Impact strength b) Transverse strength

c) Tear strength d) Fatigue strength

12) Phenol and formaldehyde are polymerized to a resultant product known as

a) Vulcanite b) Bakelite

c) Cryolite d) Cellulose nitrate

13) In which of the following hardness tests, hardness is measured as the depth of penetration

a) Brinell b) Rockwell
c) Vickers d) Knoop

14) The binder used in gypsum bonded investments is

a) Sodium phosphate

b) Ethyl silicate

c) Calcium sulfate alpha hemihydrate

d) Ammonium phosphate

15) Hardness of elastomers is measured by using

a) Oscillating rheometer

b) Shore a durometer

c) Vicat penetrometer

d) Gillmore needle 



d) Ammonium phosphate

15) Hardness of elastomers is measured by using

a) Oscillating rheometer

b) Shore a durometer

c) Vicat penetrometer

d) Gillmore needle

Earning:  ₹ 6.00/-