Question 1

How much "water of reaction" is required for the actual setting of 100 g of calcium sulfate hemihydrate powder?

Accepted Answer

A) 12 mL 
B) 18 mL 
C) 24 mL 
D) 32 mL 
E) 50 mL 
A) 12 mL 
B) 18 mL 
C) 24 mL 
D) 32 mL 
E) 50 mL B

Question 2

What is mixing time?

Accepted Answer

A) Time elapsed from the start of mixing until the end of mixing 
B) Time elapsed from the beginning of mixing until the beginning of setting 
C) Time elapsed from the beginning of the working interval until the end of the setting interval 
D) The working interval 
E) The time required by the operator to handle and place a dental material 
A) Time elapsed from the start of mixing until the end of mixing 
B) Time elapsed from the beginning of mixing until the beginning of setting 
C) Time elapsed from the beginning of the working interval until the end of the setting interval 
D) The working interval 
E) The time required by the operator to handle and place a dental material A

Question 3

Which one of the following impression materials is typically mixed by extrusion through a disposable nozzle?

Accepted Answer

A) Alginate 
B) ZOE 
C) Polyvinyl siloxane 
D) Silicone 
E) None of the above 
A) Alginate 
B) ZOE 
C) Polyvinyl siloxane 
D) Silicone 
E) None of the above C

Question 4

Which component of the dentin bonding system is MOST likely to cause skin sensitization in dental personnel?

Accepted Answer

A) Phosphoric acid 
B) Hydroxyethyl methacrylate (HEM
A)  
C) Ethanol 
D) Urethane dimethacrylate (UDM
A)  
E) Bisphenol A-glycidylmethacrylate (Bis-GM
A)  
A) Phosphoric acid 
B) Hydroxyethyl methacrylate (HEM
A)  
C) Ethanol 
D) Urethane dimethacrylate (UDM
A)  
E) Bisphenol A-glycidylmethacrylate (Bis-GM
A)

Question 5

What is the major difference between plaster and stone powders?

Accepted Answer

A) Hydration state 
B) Color 
C) Crystal structure 
D) Powder particle packing 
E) Sterilization techniques 
A) Hydration state 
B) Color 
C) Crystal structure 
D) Powder particle packing 
E) Sterilization techniques

Question 6

Which one of the following materials practi?cally CANNOT be fabricated using CAD/CAM procedures?

Accepted Answer

A) Dental composite 
B) Dental porcelain 
C) Gold alloys 
D) Zirconia 
E) Alumina 
A) Dental composite 
B) Dental porcelain 
C) Gold alloys 
D) Zirconia 
E) Alumina

Question 7

Which of the following materials undergoes problematic imbibition?

Accepted Answer

A) Gold restorations 
B) Dental sealant 
C) Dental composite 
D) Dental cement 
E) Alginate impression material 
A) Gold restorations 
B) Dental sealant 
C) Dental composite 
D) Dental cement 
E) Alginate impression material

Question 8

Which of the following choices is MOST similar to a compomer?

Accepted Answer

A) Polycarboxylate 
B) Glass ionomer 
C) Zinc phosphate cement 
D) Composite 
E) Giomer 
A) Polycarboxylate 
B) Glass ionomer 
C) Zinc phosphate cement 
D) Composite 
E) Giomer

Question 9

What events contribute to a relatively high nickel sensitivity level in women?

Accepted Answer

A) Greater contact with metal coinage 
B) Contact dermatitis from nickel-based jewelry 
C) Greater contact with stainless steel 
D) Genetic differences 
E) Less protective skin and hair during contact 
A) Greater contact with metal coinage 
B) Contact dermatitis from nickel-based jewelry 
C) Greater contact with stainless steel 
D) Genetic differences 
E) Less protective skin and hair during contact

Question 10

What are the three principal components of dental porcelains?

Accepted Answer

A) Silica, calcium oxide, and alumina 
B) Alumina, zinc oxide, and calcium fluoride 
C) Alumina, potassium oxide, and calcium oxide 
D) Calcium oxide, magnesium oxide, and chromium oxide 
E) Silica, alumina, and potassium oxide 
A) Silica, calcium oxide, and alumina 
B) Alumina, zinc oxide, and calcium fluoride 
C) Alumina, potassium oxide, and calcium oxide 
D) Calcium oxide, magnesium oxide, and chromium oxide 
E) Silica, alumina, and potassium oxide

Question 11

Which one of the following is TRUE about pit-and-fissure sealants?

Accepted Answer

A) Uncured sealant along air-exposed surfaces will finish curing in 24 hours 
B) Sealants should be filled to improve their mechanical properties 
C) Tinted sealants are more useful than colorless ones 
D) Sealant inspection is unnecessary after 2 years 
E) Partial sealing of pits and fissures is better than no sealing at all 
A) Uncured sealant along air-exposed surfaces will finish curing in 24 hours 
B) Sealants should be filled to improve their mechanical properties 
C) Tinted sealants are more useful than colorless ones 
D) Sealant inspection is unnecessary after 2 years 
E) Partial sealing of pits and fissures is better than no sealing at all

Question 12

Engineering strain is computed as:

Accepted Answer

A) Change between the initial and final strain divided by the time 
B) Area under the stress-strain curve 
C) Load at yield divided by elastic deformation 
D) Applied load divided by the total elastic deformation 
E) Deformation divided by the original length of the object 
A) Change between the initial and final strain divided by the time 
B) Area under the stress-strain curve 
C) Load at yield divided by elastic deformation 
D) Applied load divided by the total elastic deformation 
E) Deformation divided by the original length of the object

Question 13

What is TRUE about the dentin smear layer?

Accepted Answer

A) 50- to 100-micron-thick debris layer 
B) Composed mostly of collagen and water 
C) Dissolved by acid etching during bonding procedures 
D) Easily removed with air-water spray 
E) Effectively seals dentin 
A) 50- to 100-micron-thick debris layer 
B) Composed mostly of collagen and water 
C) Dissolved by acid etching during bonding procedures 
D) Easily removed with air-water spray 
E) Effectively seals dentin

Question 14

Which one of the following terms is NOT important for color matching?

Accepted Answer

A) Hue, Chroma, Value 
B) Ambient lighting conditions 
C) Surface gloss 
D) Translucency 
E) Imbibition 
A) Hue, Chroma, Value 
B) Ambient lighting conditions 
C) Surface gloss 
D) Translucency 
E) Imbibition

Question 15

What component is involved with very-high-strength dental ceramics?

Accepted Answer

A) Silica 
B) Silicon carbide 
C) Potassium oxide 
D) Chromium oxide 
E) Zirconia 
A) Silica 
B) Silicon carbide 
C) Potassium oxide 
D) Chromium oxide 
E) Zirconia

Question 16

Why is the linear coefficient of thermal expansion important for restorative materials?

Accepted Answer

A) It predicts the mismatch in expansion and contraction at the interface of restorative materials 
B) It predicts the loss in strength of a restorative material as the temperature increases 
C) It indicates the insulating characteristics of a restorative material 
D) It indicates the resistance to thermal degradation of a material 
E) It indicates the amount of expansion and contraction on polymerization 
A) It predicts the mismatch in expansion and contraction at the interface of restorative materials 
B) It predicts the loss in strength of a restorative material as the temperature increases 
C) It indicates the insulating characteristics of a restorative material 
D) It indicates the resistance to thermal degradation of a material 
E) It indicates the amount of expansion and contraction on polymerization

Question 17

What is the principal reason for the shift away from dental amalgam use?

Accepted Answer

A) Toxicity of mercury to office personnel 
B) Environmental concerns about ineffective mercury recycling from dental offices 
C) Much improved mechanical properties of other esthetic materials such as composites 
D) Patient hypersensitivity problems to mercury released from amalgams 
E) Lower cost of procedures for alternative restorative materials 
A) Toxicity of mercury to office personnel 
B) Environmental concerns about ineffective mercury recycling from dental offices 
C) Much improved mechanical properties of other esthetic materials such as composites 
D) Patient hypersensitivity problems to mercury released from amalgams 
E) Lower cost of procedures for alternative restorative materials

Question 18

Which method is recommended to minimize the escape of mercury vapor during amalgam mixing?

Accepted Answer

A) Mortar and pestle 
B) Friction-fit capsule 
C) Precapsulated alloy and mercury 
D) Covered mixing arm on the triturator 
E) None of the above 
A) Mortar and pestle 
B) Friction-fit capsule 
C) Precapsulated alloy and mercury 
D) Covered mixing arm on the triturator 
E) None of the above

Question 19

Which one of the following terms is NOT specifically related to soldering?

Accepted Answer

A) Filler metal 
B) Brazing 
C) Joining 
D) 600 to 650 fine 
E) Precious metal content 
A) Filler metal 
B) Brazing 
C) Joining 
D) 600 to 650 fine 
E) Precious metal content

Question 20

Which of the following is NOT a scaffold material for tissue engineering?

Accepted Answer

A) Bone chips 
B) Gold mesh 
C) Polylactic acid (PL
A)  
D) Bioglass 
E) Collagen 
A) Bone chips 
B) Gold mesh 
C) Polylactic acid (PL
A)  
D) Bioglass 
E) Collagen

Exam 13: Biomaterials

How much "water of reaction" is required for the actual setting of 100 g of calcium sulfate hemihydrate powder?

What is mixing time?

Which one of the following impression materials is typically mixed by extrusion through a disposable nozzle?

Which component of the dentin bonding system is MOST likely to cause skin sensitization in dental personnel?

What is the major difference between plaster and stone powders?

Which one of the following materials practi?cally CANNOT be fabricated using CAD/CAM procedures?

Which of the following materials undergoes problematic imbibition?

Which of the following choices is MOST similar to a compomer?

What events contribute to a relatively high nickel sensitivity level in women?

What are the three principal components of dental porcelains?

Which one of the following is TRUE about pit-and-fissure sealants?

Engineering strain is computed as:

What is TRUE about the dentin smear layer?

Which one of the following terms is NOT important for color matching?

What component is involved with very-high-strength dental ceramics?

Why is the linear coefficient of thermal expansion important for restorative materials?

What is the principal reason for the shift away from dental amalgam use?

Which method is recommended to minimize the escape of mercury vapor during amalgam mixing?

Which one of the following terms is NOT specifically related to soldering?

Which of the following is NOT a scaffold material for tissue engineering?

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Prevention of Disease Transmission in Oral Health Care

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