Biomaterial Yin Sithoen
Biomaterials Mastery Quiz
Test your knowledge of biomaterials and dental applications with this comprehensive quiz! Designed for students, professionals, and enthusiasts in the field of dentistry and materials science, this quiz will challenge your understanding of critical concepts, materials, and techniques.
Prepare to tackle questions covering:
- Properties of various dental materials
- Clinical applications of biomaterials
- Restorative dentistry practices
1. Proportional limit is defined as :
The stress/strain ratio within the elastic limit in a structure
The maximum force required to cause a structure to break
The maximum stress that can be induced without permanent deformation
A deformation resulting from an applied load
2. Which of the following is a measure of resistance to fracture ?:
Hardness
Toughness
Brittleness
Springiness
3. Zinc oxide eugenal impression should be removed from oral cavity :
When it can be easily indented by a blunt instrument
When the material cannot be intended by a blunt instrument
When the material is glossy
Exactly after four minutes after kneading
4. Oil of clove is sometimes used in preference to eugenal in ZOE paste because :
It increases mixing property of paste and therefore improves impression recorded
Reduces burning sensation of paste
Has a better reaction with zinc oxide
To increase setting time
5. One of the following statements which one is incorrect regarding polyether :
The main chain of polyether consists of copolymer of ethylene oxide and tetrahydrofuran
The main chain consists of copolymer of methylene oxide and tetrahydrofuran
Aromatic sulfonate ester acts as a cross linking agent
The base paste consists of polyether polymer
6. Clinical significance of smear layer :
Bonded to tooth structure and prevents composite adhesion
Increases the bonding action of the bonding agent
Provides calcium for adhesion of composites
Improve the strength of the composite
7. The common characteristic for pit and fissure sealant composite resins, acrylic appliances and elastomeric impression materials is
All of them are polymers
All of them can be employed as anterior filling materials
All of them should be heated before using
All of them are a result of secondary reaction
8. A cavity varnish used for lining the preparation for a dental amalgam restoration will :
Provide thermal insulation
Provide electrical insulation
Reduce early marginal leakage tooth structure
Provide strength of amalgam
9. The noble or base metal alloys used for PFM should have the following requisite :
Should bond with dental porcelain
Coefficient of thermal expansion should not be compatible with porcelain
Its melting temperature should be low in comparison with firing temperature of porcelain
Should be brittle
10. Contamination of zinc-containing amalgam by moisture during triturating or condensation :
Has no appreciable effect on properties except to the susceptibility to tarnish
Results in a sharp decrease in flow
Results in a marked expansion
Increases the setting time
11. The restorative material used to restore a small portion of an anterior tooth should have which of the following properties ?
Esthetics
High strength
Amalgam
Ease of casting
12. An anterior fixed partial denture could have facings constructed of which of the following materials ?
Composite resin
Metal
Amalgam
Gold alloy
13. Which of the following sentences describes the construction of removable partial dentures ?
Artificial acrylic teeth are attached
They are attached to upper natural teeth with cements,
They are attached to lower natural teeth with cements,
They are attached to natural teeth with cements,
14. Which of these statements apply to the filler particles of composites ?
Microhybrid composites contain as much as 84% filler by weight.
Microfilled
Microfilled composites contain more filler than all-purpose composites.
All are correct
15. Which of the following initiator-accelerator systems is needed for a light-activated composite?
Diketone-amine
Peroxide-amine
Organic acid-peroxide
Organic acid-metal ion
16. Which of the following office conditions minimize the health hazard from spilled mercury ?
Amalgam scrap stored in a closed container
Floor carpeting
Wall carpeting
Baseboard heating
17. Which of the following represents the maximum safe concentration of mercury vapor in the breathing zone for a 40-hour workweek ?
0.05 mg Hg/m3 of air
30 ng Hg/m3 of air
100 ng Hg/m3 of air
All are corrects
18. Which one of the following phases in dental amalgam restoration is most prone to electrochemical corrosion ?
Sn-Hg
Cu-Sn
Ag-Su
Ag-Hg
19. Which one of the following phases in dental amalgam restoration has the best mechanical properties ?
Ag-Su
Cu-Sn
Sn-Hg
Ag-Hg
20. Which one of the following mixing methods permits the escape of dental amalgam mercury vapor ?
Mixing in a mortar and pestle
Proportioning mercury and alloy into a friction-fit capsule
Triturating precapsulated alloy and mercury
A cover over the mixing arms on a triturator
21. A small portion of an anterior tooth would most likely be restored with which of the following ?
Amalgam
Composite resin
Gold alloy
Porcelain
22. A portion of a posterior tooth that is subject to high biting forces would likely be restored with which of the following ?
Amalgam
Composite resin
Acrylic resin
Glass ionomer
23. A direct restorative material used frequently to restore a portion of a posterior tooth that is subject to large biting forces would possess which of the following properties ?
Esthetics
High strength
Ease of casting
Thermal insulation
24. A full crown on a maxillary anterior tooth may be restored with which of the following restorative materials ?
Ceramic
Gold alloys
Composite resin
Amalgam
25. An anterior fixed partial denture could have facings constructed of which of the following materials ?
Ceramic
Gold alloy
Silver alloys
Amalgam
26. Which of the following sentences describes the construction of removable partial dentures ?
They are removable and attached to teeth with clasps.h with cements,
They are removable and attached to teeth with clasps.
Carbone steal
Artificial waxes teeth are attached
27. Full denture bases are usually made from which of the following materials ?
Composite restorative resins
Gold alloys
Acrylic resin
Ceramic
29. Acrylic resins are used in which of the following ?
Posterior inlays
Denture bases
Ceramic ( porcelain )-fused-to-metal crowns
Anterior onlays
30. Which of the following materials are used for dental implants ?
Gold alloys
Cobalt and chromium alloys
Titanium
Metal alloys
31. Which of the following statements about curing of composites are true ?
Exposure times of 2 to 3 seconds are needed for polymerization with visible light.
Before light activation, the base and catalyst pastes are mixed.
Lights with both blue and red wavelengths are equally effective for polymerization.
Light from an argon laser will activate polymerization.
32. Which of the composites with the following fillers may be radiopaque ?
Quartz
Lithium aluminum silicate
Colloidal silica
Barium glass
33. Which of the following polymer systems are used for the organic matrix in composites ?
Bisphenol A-glycidyl methacrylate (Bis-GMA)
Poly (methyl methacrylate)
Polystyrene
Pheyl methacrylate
34. Which of the following properties are higher for microhybrid composites than for microfilled composites
Polymerization shrinkage
Thermal expansion
Water sorption
Modulus of elasticity
35. Which of the following is the best choice of restorative material to achieve moderate to high strength, fluorite release, and esthetics ?
Composite
Compomer
Hybrid ionomer
Glass ionomer
36. Which of the following statements about laboratory composites are true ?
Curing using light, heat, and pressure increase the wear resistance.
Bridge prepared from laboratory composites require a metal substructure.
Fiber reinforcement increases their strength but decrease their rigidity.
Restorations prepared from laboratory composites typically are cemented with zinc phosphate cement.
37. Which of the following statements about adhesion of composite restorations to tooth structure are true
Bonding is achieved to enamel by application of an acid etchant followed by application of a bonding agent and then the composites resin.
The bonding agent forms a hybrid layer with enamel.
The bonding agent forms a micromechanical bond with enamel but a chemical bond with dentin.
Most bonding agent bond more effectively to a dry tooth surface.
38. Which of the following statements about compomers are true ?
They are two-paste systems that self-cure within 2 to 3 minutes.
Because of their resin content, they require a bonding agent for adhesion to tooth structure.
They typically are recommended for class II restorations.
They also are know as GIC
39. Which of the following statements apply to the packable composites ?
Their depth of cure allows bulk polymerization, which has been shown to be clinically effective.
Their wear rate is low (3.5 µm/year). Which is similar to that of amalgam.
They are radiolucent.
Radiopaque
40. Which one of the following office conditions minimize the health hazard from spilled mercury ?
Baseboard heating
Floor carpeting
Fluorite release
Amalgam scrap stored in a closed container
41. Which one of the following represents the maximum safe concentration of mercury vapor in the breathing zone for a 40-hour work week ?
0.04 mg Hg/m3 of air
30 mg Hg/m3 of air
100 mg Hg/m3 of air
0.05 mg Hg/m3 of air
42. Once amalgamation has occurred, which of the following is true of mercury ?
Is combined primarily with silver
Has the toxic properties of unreacted mercury
Can form at the surface of amalgam restorations if heated to 0° C
Composite restorative resins
43. For each property, list the amalgam type (irregular low-copper, admixed high-copper, and spherical high-copper ) that has the highest value?.
1-hour compressive strength spherical high-copper
Tensile strength spherical high-copper
Creep irregular low-copper
Creep irregular high-copper
44. Which of these statements are correct in terms of preparing a correctly triturated mass of amalgam ?
An undertriturated mass is crumbly and dull.
A correctly triturated mass is a smooth homogeneous, and dull.
An overmixed mass is removed readily from the capsule but is soupy in appearance.
Dental amalgam is a mixture of silver alloys and mercury.
45. Which statements are true for bonding of amalgam to tooth structure ?
The most effective bonding agents contain copalite.
Shear bond strength using amalgam bonding to teeth in clinically proven to be as high as that for bonding composites to teeth.
The use of amalgam bonding restores the strength of the clinical crown to its original condition.
The use of amalgam bonding reduces marginal leakage of amalgam restorations.
46. Which of the following phases in dental amalgam restoration is most prone to electrochemical properties ?
Ag-Sn
Cu-Sn
Sn-Hg
Ag-Hg
47. Which of the following phases in dental amalgam restoration has the best mechanical properties ?
Ag-Sn
Cu-Sn
Sn-Hg
Ag-Hg
48. Which of the following mixing methods permits the escape of dental amalgam mercury vapor ?
Mixing in a mortar and pestle
Proportioning mercury and alloy into a friction-fit capsule
Triturating precapsulated alloy and mercury
A cover over the mixing arms on a triturator
49. Which one of the following is not true about high-copper dental amalgam restorations ?
Contain both Sn and Ag in the composition as well dental amalgams
Contain both Sn and Ag in the composition as well
Produce excessive creep
Restorations are more brittle than low-copper versions
50. Which one of the following is not a criterion for a failed high-copper dental amalgam restorations ?
Creep of the restoration out of the cavity preparation in proximal areasng occlusal margins
Creep of the restoration out of the cavity preparation in proximal areas
Wear facets along the occlusal contach areas
Micrographs of alloys particles.
51. Dental personnel can do which one of the following to limit their exposure to mercury ?
Sterilize amalgam scrap
Vacuum up a spill immediately
Avoid touching freshly mixed amalgam
Avoid polishing amalgams
52. The primary difference between low- and high-copper amalgams is which of the following ?
The amount of copper
The amount of copper and zinc
The amount of copper and tin
The amount of copper and silver
53. Ideally, the set amalgam should do which of the following ?
Expand greatly to provide marginal seal against the tooth
Shrink significantly to provide space for correction products to seal the margins
Have little dimensional change
Properties of amalgam
54. The physical properties most desirable in set amalgam are which of the following ?
Higher strength, low creep, low corrosion
Low strength, low creep, low corrosion
Higher strength, high creep, low corrosion
Higher strength, high creep, high corrosion
55. Higher mercury left in an amalgam leads to which of the following ?
Higher creep
Higher strength
Low corrosion
High corrosion
56. Which of the following occurs when dental amalgam is overmixed ?
Compressive strength decreases
Corrosion decreases
Tensile strength increases
Corrosion increases
57. The physical property measured in terms of the deformation of the structure per until dimensions is ?
Stress
Strain
Space lattice
Amorphous material
60. Crystalline materials have :?
No space lattice
Less stable space lattice
Well-defined melting
No well-defined melting
61. Materials having coefficient of thermal expansion close to the tooth structure :?
Unfilled
Silicate cement
Glass ionomer cement
Amalgam
62. The temperature at which a solid changes into liquid is called :?
Temperature of vaporization
Fusion temperature
Specific temperature
Latent heat
63. Strain that occurs when the material is stressed to its proportional limit is called :?
Resilience
Flexibility
Modulus of elasticity
Toughness
64. Which of the following uses a hardened steel ball indenting tool ?
Rockwell hardness test
Vichers hardness test
Brinell hardness test
Knoop hardness test
65. A measure of ductility of a material is referred to as :?
Proportional limit
Percentage elongation
Flexibility
Yield strength
66. The energy absorbed by a material when it is stressed to its proportional limit is :?
Impact strength
Toughness
Resilience
Flexibility
67. The strain at which the plastic strain develops may be represented by :?
Elastic limit, modulus of elasticity, tensile strength
Elastic limit, yield strength, proportional limit
Yield strength, tensile strength, toughness
Toughness, rigidity, resilience
68. The tendency of stainless steel to break under repeated condition of cyclic stressing below the ultimate strength is :?
Resilience
Fatigue
Creep
Ductility
69. Thermal conductivity is proportional to :?
Area of conduction
Hardness of metal
Fusion temperature
Type of metal
70. Which of the following is a measure of resistance to fracture ?
Hardness
Toughness
Brittleness
Springiness
71. Regarding Knoop hardness number, which of the following material is closest to that of dentine (KHN 65) ?
Amalgam
σ½ Pure gold
Composites
Silicates
73. Which of the following material has a high coefficient of thermal expansion ?
Silicate cement
Unfilled acrylic resin
Glass ionomer cement
Composite resin
75. Side effects and complications resulting from treatment by a physician or dentist is :?
Iatrogenesis
Teratogenesis
Calcium anhydrate
Calcium phosphate
77. Modifiers are added to plaster of Paris mainly to :?
Increase strength
Get a smooth surface
Reduce porosity
Regulate the setting time
79. Setting of plaster of Paris is a result of :?
Solubility difference between hemihydrates and dehydrate
Interaction between hemihydrates and water
Loss of water from hemihydrates
Indirect interaction between hemihydrates
81. Binder in the phosphate investment is :?
Cristobalite
Magnesium oxide and monoammonium phosphate
Manganese dioxide
Phosphoric acid
82. Potato starch is contained in which impression material ?
Impression compound
Agar agar
Impression plaster
Potassium sulfate
83. Commonly used coloring agent in impression plaster is :?
Congo red
Indigo dye
Alizarin red
Metallic oxide
84. Impression plaster is a :?
Mucocompressive material
Thermoplastic material
Mucostatic material
Reversible impression material
86. Impression compound is characterized by :?
Crystalline in nature with definite melting point
Amorphous in nature with high thermal conductivity
Amorphous in nature with low thermal conductivity
Crystalline in nature with high thermal conductivity
87. Following are the functions of impression compound except :?
To make impression of edentulous ridge
To make individual die impression with copper band
To make special tray for final impression
To record mucostatic impressions
88. Stearic acid in impression compound :?
Reduces plasticity
Reduces brittleness
Reduces flow
Increase setting time
89. Most common use of Zinc oxide eugenol paste :?
Wash impression for edentulous patients
Dual impression for Partially edentulous patients
As interocclusal record material
Surgical paste
90. Greater ratio fo zinc oxide to eugenol will have the following effect on setting time :?
Decreases setting time
Increases setting time
Does not alter setting time
Depends on rate of mixing
91. Which of the following properties would be of least importance, when selecting an impression material ?
Dimensional stability
Biocompatibility
Flow
Adhesion
92. The gelation temperature of agar hydrocolloid impression material should be :?
Far below the oral temperature
37-450C
100C higher than mouth temperature
45-600C
93. Pick out the incorrect statement regarding alginate impressions :?
May exhibit a fluid exudates on the surface as a result of imbibitions
Will be shrink as a result of syneresis
Will take up water and expand if kept wet
Is an irreversible hydrocolloid impression material
94. Alginate impression material deteriorates rapidly at :?
Normal room temperature
Elevated temperature
Low temperature
Temperature does not cause any change in shelf-life
95. Hydrocolloid impression should be removed from the mouth with a sharp jerk because :?
It is the easiest method of removal
Faster rate of removal increases the yield strength
It decreases the time for syneresis to occur
The brush heap structure of a gel responds more favorably to a sudden force
96. Thickness of the gel between the tray and tissue for either agar or alginate should always be at least :?
1 mm
2 mm
3 mm
4 mm
97. Setting time of alginate can be better controlled by :?
Mixing time
Temperature of water used of mixing
Changing water: powder ratiocelerators and retarders
Changing water: powder ratio
98. In alginate impression the final gel is :?
Sodium sulphate
Calcium sulphate
Sodium alginate
Calcium alginate
99. Oxalates, carbonates, potassium, trisodium phosphates are added to alginate as :?
Accelerators
Retarders
Reactors
Fillers
100. Main disadvantage of laminate technique of making impression is : ?
Bond between agar and alginate is not very strong
Maximum details are not produced
Cost factor is high
Difficult to manipulate
101. Which of the following is recommended as an adhesive to trays with polysulfides ?
Polydimethyl siloxane
Styrene-acrylonitrile
Ethyl silicate
Acrylic resin
102. Which has the highest viscoelastic property and requires more time to recover from deformation ?
Condensation silicone
Polysulfide
Polyether
Addition silicone
104. The most accurate polysulfide impressions are made by using a custom acrylic tray because :?
Custom tray made of plastic material ensures a uniform thickness of impression material
It can hold more amount of impression material
More pressure can be applied during impression making
The tray does not distort during impression making
105. The byproduct in condensation silicones is :?
Ethyl alcohol
Methyl alcohol
Propyl alcohol
Butyl alcohol
106. The greatest amount of dimensional change after setting is exhibited by :?
Polysulfides
Condensation silicones
Addition silicones
Polyether
107. The catalyst used for condensation silicones is :?
Lead dioxide
Oleic acid
Stannous octoate
Platinum
108. The impression material which is routinely used in auto mixing devicee system is :?
Polyvinyl siloxane
Polyether
Polysulfied
Condensation silicone
109. Which of the following elastomers is suited for multiple cast pouring :?
Polysulfide
Condensation silicone
Addition silicone
Polyether
110. One of the following statements which one is incorrect regarding addition silicones :?
No evolution of any byproduct under all circumstances
Undetectable distortion on removal
Dimensionally stable even after 1 week
Can be used in automixing devices
111. Sulfur contamination from natural latex gloves inhibits the setting of :?
Alginate
Polyether
Polyvinyl siloxane
Zinc oxide eugenol impression paste
112. When a mechanical device is used for mixing addition silicones :?
There is no greater uniformity in proportioning and mixing
More possibilities of contamination
Mixing time is reduced
Mixing time is long
113. Distortion on removal from undercuts in addition silicones is very less due to :?
Stiffness of the material
Increased strain rate on unset material
Lowest strain in compression
Lowest strain in compression
Shrinkage of material
114. Polyether is different from other elastomers in the following aspects :?
Low stiffness
Hydropholic in nature
Can not be used as light cure material
High stiffiness
115. Stiffness of the material with passage of time is maximum in :?
Polysulfides
Polyether
Condensation silicones
Addition silicones
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