ABPD STUDY GUIDE EXAM
QUESTIONS WITH COMPLETE
SOLUTIONS
The flexural and compressive moduli of microfilled and flowable composites are about
50% lower than values for the multipurpose hybrids and packable composite resin
restorations. This reflects the lower volume percent of filler present in microfilled and
flowable composites.
A. The first statement is true, the second statement is false.
B. The first statement is false, the second statement is true.
C. Both statements are true.
D. Both statements are false. - Answer- C. Both statements are true.
The differences between a packable composite and a hybrid one are:
a) the inorganic filler material of hybrid composites is approximately 80 % by weight
b) packable composites are less viscous than hybrid composites
c) the hybrid composites inorganic fillers have an average particle size of 0.4 to 1 m
d) the packables have a smoother surface texture in the finished restoration
e) a and c - Answer- e) a and c
When considering coefficient of thermal expansion (COTE), which material has the
highest COTE on average?
A. Pit and fissure sealants
B. Composite resins
C. Amalgam
D. Gold
E. Glass Ionomer - Answer- A. Pit and fissure sealants
Which of the following statements is true regarding adhesive of resins to dentin?
a. The 3-step total etch system includes: etchant, primer, and bonding agent.
b. The all-in-one self-etch technique etches the enamel and removes the smear layer.
c. The bonding agent in a total etch system includes monomers that are mostly
hydrophilic such as Bis-GMA.
d. All in one self etching adhesive are hydrophobic and not likely to undergo water
degradation. - Answer- a. The 3-step total etch system includes: etchant, primer, and
bonding agent.
,Arrange the order of these adhesives according to their bond strengths from lowest to
highest.
A. Total-etch two-step; Self-etch one-step; Self-etch two-step
B. Total-etch two-step; Self-etch two-step; Self-etch one-step
C. Self-etch two-step; Self-etch one-step; Total-etch two-step
D. Self-etch one-step; Self-etch two-step; Total-etch two-step - Answer- D. Self-etch
one-step; Self-etch two-step; Total-etch two-step
Which statement regarding packable resins and hybrid composite is correct?
a. Packable resins have superior marginal integrity
b. Hybrid resins are more resistant to surface texture loss over time
c. Hybrid resins have noticeably better color match
d. Both systems have similar color match and marginal discoloration - Answer- d. Both
systems have similar color match and marginal discoloration
TEGDMA (triethylene glycol dimethacrylate) serves what function in composite?
A. photoinitiator
B. viscosity reduction
C. color stabilizer
D. filler - Answer- B. viscosity reduction
Transillumination may be most helpful in detecting caries in what location of the mouth?
a. Posterior teeth
b. Anterior proximal caries
c. Class V lesions
d. Pits and fissures - Answer- b. Anterior proximal caries
In amalgam bonding, the mechanism for attachment of the bonding resin to tooth
structure is identical to the mechanism that resin bonding systems use to attach resin
composite to dentin and enamel. However, the amalgam-to-resin attachment is entirely
mechanical.
A. The first statement is true, the second statement is false.
B. The first statement is false, the second statement is true.
C. Both statements are true.
D. Both statements are false. - Answer- C. Both statements are true.
The use of amalgam bonding has several possible benefits except:
a. Less need for the removal of tooth structure such as grooves and dovetails
b. Bonded amalgam may increase the fracture resistance of restored teeth
,c. The adhesive resin liner may seal margins better than the traditional cavity varnishes
with decreased risks for postoperative sensitivity
d. Long-term clinical and laboratory studies are well established for its effectiveness -
Answer- d. Long-term clinical and laboratory studies are well established for its
effectiveness
When considering placing a fiber post following NSRCT, all of the following are true,
EXCEPT
A. The post length should be at least ½ the length of the root contained in the remaining
radiographic bone
B. One should prepare the canal for the largest fiber post thus maximizing retention of
the core
C. The purpose of the post is not to reinforce endodontically treated teeth but is to retain
the core
D. The best retention for a fiber post will most likely be achieved using etch and rinse
and self cure resin cement - Answer- B. One should prepare the canal for the largest
fiber post thus maximizing retention of the core
Which of the following statement is incorrect concerning the use of a non-rigid fiber
post?
A. Bonding fiber posts to root canal dentin can improve the distribution of forces applied
along the root
B. A cemented fiber post is retentive with the least amount of stress generated on the
canal walls
C. Most failures of fiber posts are due to catastrophic root fractures
D. A light transmitting post results in better polymerization of resin composites in the
apical area of a root canal - Answer- C. Most failures of fiber posts are due to
catastrophic root fractures
Which of the following shows the correct order of luting a porcelain veneer with a resin
cement after removal of provisionals.
A. Try-in paste; Rinse thoroughly, Etch veneer with 35% phosphoric acid, Primer in
veneer, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid, Single
bond adhesive, Resin Cement in Veneer.
B. Try-in paste, Rinse thoroughly, Etch tooth with 35% phosphoric acid, Single bond
adhesive, Resin Cement in Veneer
C. Try-in paste, Rinse thoroughly, Etch veneer with 35% phosphoric acid, Primer in
veneer, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid, Single
bond adhesive, Resin Cement in Veneer Rinse thoroughly, Etch tooth with 35%
phosphoric acid, Single bond adhesive, Resin Cement placed on tooth.
, D. Try-in paste, Rinse thoroughly, Etch veneer with 35% phosphoric acid, Primer in on
tooth, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid, Si -
Answer- A. Try-in paste; Rinse thoroughly, Etch veneer with 35% phosphoric acid,
Primer in veneer, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid,
Single bond adhesive, Resin Cement in Veneer.
Compared to hybrid composite, compomers have all the following characteristics,
EXCEPT
a. Compomers contain poly-acid modified monomers with fluoride releasing silicate
glasses
b. setting occurs primarily by light-cured polymerization, but acid-base reaction also
occur as compomers absorb water upon contact with saliva
c. compomers have higher compressive strength and can have fluoride recharged from
daily fluoride exposure
d. both materials can be used to restore Class 1 and 2 in primary teeth - Answer- c.
compomers have higher compressive strength and can have fluoride recharged from
daily fluoride exposure
Which of the following is not an advantage to using composite as a core material?
a. Adequate compressive strength
b. Adequate fracture toughness
c. Dimensional stability in a wet environment
d. Tooth colored material for use under all ceramic restorations - Answer- c.
Dimensional stability in a wet environment
Retention grooves placed on the mesial and distal of a crown prep increase the
resistance to dislodgement of forces in which direction?
a. Buccal lingual
b. Mesial distal
c. Occluso vertical - Answer- a. Buccal lingual
The advantage of the ultrathin metal matrices ("ring") system for the placement of
posterior Class II composites are all of the following except:
A. Tight interproximal contacts are more easily developed
B. They provide better proximal contours
C. They simplify matrix placement for single proximal-surface restorations
D. Used with the plastic, light-reflecting wedge creates a more effective interproximal
contact - Answer- D. Used with the plastic, light-reflecting wedge creates a more
effective interproximal contact
Which of the following represents the correct order of increasing flexural strength of
various dental ceramics?
QUESTIONS WITH COMPLETE
SOLUTIONS
The flexural and compressive moduli of microfilled and flowable composites are about
50% lower than values for the multipurpose hybrids and packable composite resin
restorations. This reflects the lower volume percent of filler present in microfilled and
flowable composites.
A. The first statement is true, the second statement is false.
B. The first statement is false, the second statement is true.
C. Both statements are true.
D. Both statements are false. - Answer- C. Both statements are true.
The differences between a packable composite and a hybrid one are:
a) the inorganic filler material of hybrid composites is approximately 80 % by weight
b) packable composites are less viscous than hybrid composites
c) the hybrid composites inorganic fillers have an average particle size of 0.4 to 1 m
d) the packables have a smoother surface texture in the finished restoration
e) a and c - Answer- e) a and c
When considering coefficient of thermal expansion (COTE), which material has the
highest COTE on average?
A. Pit and fissure sealants
B. Composite resins
C. Amalgam
D. Gold
E. Glass Ionomer - Answer- A. Pit and fissure sealants
Which of the following statements is true regarding adhesive of resins to dentin?
a. The 3-step total etch system includes: etchant, primer, and bonding agent.
b. The all-in-one self-etch technique etches the enamel and removes the smear layer.
c. The bonding agent in a total etch system includes monomers that are mostly
hydrophilic such as Bis-GMA.
d. All in one self etching adhesive are hydrophobic and not likely to undergo water
degradation. - Answer- a. The 3-step total etch system includes: etchant, primer, and
bonding agent.
,Arrange the order of these adhesives according to their bond strengths from lowest to
highest.
A. Total-etch two-step; Self-etch one-step; Self-etch two-step
B. Total-etch two-step; Self-etch two-step; Self-etch one-step
C. Self-etch two-step; Self-etch one-step; Total-etch two-step
D. Self-etch one-step; Self-etch two-step; Total-etch two-step - Answer- D. Self-etch
one-step; Self-etch two-step; Total-etch two-step
Which statement regarding packable resins and hybrid composite is correct?
a. Packable resins have superior marginal integrity
b. Hybrid resins are more resistant to surface texture loss over time
c. Hybrid resins have noticeably better color match
d. Both systems have similar color match and marginal discoloration - Answer- d. Both
systems have similar color match and marginal discoloration
TEGDMA (triethylene glycol dimethacrylate) serves what function in composite?
A. photoinitiator
B. viscosity reduction
C. color stabilizer
D. filler - Answer- B. viscosity reduction
Transillumination may be most helpful in detecting caries in what location of the mouth?
a. Posterior teeth
b. Anterior proximal caries
c. Class V lesions
d. Pits and fissures - Answer- b. Anterior proximal caries
In amalgam bonding, the mechanism for attachment of the bonding resin to tooth
structure is identical to the mechanism that resin bonding systems use to attach resin
composite to dentin and enamel. However, the amalgam-to-resin attachment is entirely
mechanical.
A. The first statement is true, the second statement is false.
B. The first statement is false, the second statement is true.
C. Both statements are true.
D. Both statements are false. - Answer- C. Both statements are true.
The use of amalgam bonding has several possible benefits except:
a. Less need for the removal of tooth structure such as grooves and dovetails
b. Bonded amalgam may increase the fracture resistance of restored teeth
,c. The adhesive resin liner may seal margins better than the traditional cavity varnishes
with decreased risks for postoperative sensitivity
d. Long-term clinical and laboratory studies are well established for its effectiveness -
Answer- d. Long-term clinical and laboratory studies are well established for its
effectiveness
When considering placing a fiber post following NSRCT, all of the following are true,
EXCEPT
A. The post length should be at least ½ the length of the root contained in the remaining
radiographic bone
B. One should prepare the canal for the largest fiber post thus maximizing retention of
the core
C. The purpose of the post is not to reinforce endodontically treated teeth but is to retain
the core
D. The best retention for a fiber post will most likely be achieved using etch and rinse
and self cure resin cement - Answer- B. One should prepare the canal for the largest
fiber post thus maximizing retention of the core
Which of the following statement is incorrect concerning the use of a non-rigid fiber
post?
A. Bonding fiber posts to root canal dentin can improve the distribution of forces applied
along the root
B. A cemented fiber post is retentive with the least amount of stress generated on the
canal walls
C. Most failures of fiber posts are due to catastrophic root fractures
D. A light transmitting post results in better polymerization of resin composites in the
apical area of a root canal - Answer- C. Most failures of fiber posts are due to
catastrophic root fractures
Which of the following shows the correct order of luting a porcelain veneer with a resin
cement after removal of provisionals.
A. Try-in paste; Rinse thoroughly, Etch veneer with 35% phosphoric acid, Primer in
veneer, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid, Single
bond adhesive, Resin Cement in Veneer.
B. Try-in paste, Rinse thoroughly, Etch tooth with 35% phosphoric acid, Single bond
adhesive, Resin Cement in Veneer
C. Try-in paste, Rinse thoroughly, Etch veneer with 35% phosphoric acid, Primer in
veneer, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid, Single
bond adhesive, Resin Cement in Veneer Rinse thoroughly, Etch tooth with 35%
phosphoric acid, Single bond adhesive, Resin Cement placed on tooth.
, D. Try-in paste, Rinse thoroughly, Etch veneer with 35% phosphoric acid, Primer in on
tooth, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid, Si -
Answer- A. Try-in paste; Rinse thoroughly, Etch veneer with 35% phosphoric acid,
Primer in veneer, Single bond adhesive in veneer, Etch tooth with 35% phosphoric acid,
Single bond adhesive, Resin Cement in Veneer.
Compared to hybrid composite, compomers have all the following characteristics,
EXCEPT
a. Compomers contain poly-acid modified monomers with fluoride releasing silicate
glasses
b. setting occurs primarily by light-cured polymerization, but acid-base reaction also
occur as compomers absorb water upon contact with saliva
c. compomers have higher compressive strength and can have fluoride recharged from
daily fluoride exposure
d. both materials can be used to restore Class 1 and 2 in primary teeth - Answer- c.
compomers have higher compressive strength and can have fluoride recharged from
daily fluoride exposure
Which of the following is not an advantage to using composite as a core material?
a. Adequate compressive strength
b. Adequate fracture toughness
c. Dimensional stability in a wet environment
d. Tooth colored material for use under all ceramic restorations - Answer- c.
Dimensional stability in a wet environment
Retention grooves placed on the mesial and distal of a crown prep increase the
resistance to dislodgement of forces in which direction?
a. Buccal lingual
b. Mesial distal
c. Occluso vertical - Answer- a. Buccal lingual
The advantage of the ultrathin metal matrices ("ring") system for the placement of
posterior Class II composites are all of the following except:
A. Tight interproximal contacts are more easily developed
B. They provide better proximal contours
C. They simplify matrix placement for single proximal-surface restorations
D. Used with the plastic, light-reflecting wedge creates a more effective interproximal
contact - Answer- D. Used with the plastic, light-reflecting wedge creates a more
effective interproximal contact
Which of the following represents the correct order of increasing flexural strength of
various dental ceramics?
