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CRDTS Restorative Examination Practice
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
CRDTS Dental Licensing Exam Prep &
Study Guide
1. A posterior composite restoration has a deep proximal box and limited
access for light curing. Which technique most directly reduces the risk of
inadequate polymerization at the gingival margin?
A. Increase etching time
B. Place one large bulk increment
C. Use appropriately sized incremental placement with adequate curing from
accessible directions
D. Eliminate the bonding agent
Answer: Use appropriately sized incremental placement with adequate curing
from accessible directions
Rationale: Incremental placement reduces depth-related curing limitations and
allows better adaptation and light access, particularly in deep proximal
preparations.
, 2. During preparation of a Class II composite restoration, which feature is
most important for achieving predictable proximal contact?
A. Excessive occlusal convergence
B. Stable matrix adaptation against the adjacent tooth
C. Removal of all marginal ridge enamel
D. Extremely heavy wedging
Answer: Stable matrix adaptation against the adjacent tooth
Rationale: A properly adapted sectional or circumferential matrix establishes
the contour and contact relationship necessary for a functional proximal
contact.
3. A patient reports postoperative sensitivity after placement of a deep
posterior composite. The restoration is not high in occlusion. Which factor
is most likely to contribute?
A. Excessive fluoride exposure
B. Polymerization shrinkage and inadequate dentin sealing
C. Excessive polishing
D. Overcontoured enamel margins only
Answer: Polymerization shrinkage and inadequate dentin sealing
Rationale: Polymerization contraction can generate interfacial stress and
contribute to marginal leakage or postoperative sensitivity, particularly in deep
dentin.
4. When restoring a Class II lesion with a sectional matrix system, the wedge
primarily functions to:
A. Increase composite translucency
B. Prevent polymerization shrinkage
C. Adapt the matrix cervically and help compensate for the tooth–matrix
interface
D. Etch the proximal enamel
,Answer: Adapt the matrix cervically and help compensate for the tooth–matrix
interface
Rationale: The wedge provides cervical adaptation and helps prevent gingival
overhang while supporting proper proximal contour formation.
5. Which margin generally provides the most predictable bonding substrate
for an adhesive composite restoration?
A. Sclerotic dentin
B. Caries-affected dentin
C. Sound enamel
D. Contaminated dentin
Answer: Sound enamel
Rationale: Etched sound enamel provides a highly predictable micromechanical
bonding surface compared with dentin, especially sclerotic or contaminated
dentin.
6. A Class I composite preparation should generally preserve sound tooth
structure because:
A. Composite requires extensive mechanical retention
B. Adhesive dentistry allows retention with minimal removal of healthy tissue
C. Larger preparations prevent curing
D. Narrow preparations cannot be polished
Answer: Adhesive dentistry allows retention with minimal removal of healthy
tissue
Rationale: Modern adhesive restorations rely primarily on bonding rather than
traditional macromechanical retention.
7. Which clinical error most directly increases the risk of an open proximal
contact in a posterior composite restoration?
, A. Using a fine finishing diamond
B. Failure to adequately separate the teeth before matrix placement
C. Using a rubber dam
D. Applying a glycerin gel before curing
Answer: Failure to adequately separate the teeth before matrix placement
Rationale: Adequate pre-restorative separation allows the matrix to establish a
firm contact after removal of the separator or wedge.
8. Why is beveling generally avoided on the occlusal cavosurface margin of a
posterior stress-bearing composite restoration?
A. It prevents etching
B. It makes the tooth impossible to isolate
C. It may create a thin composite edge that is susceptible to fracture and wear
D. It eliminates bonding
Answer: It may create a thin composite edge that is susceptible to fracture and
wear
Rationale: Occlusal margins experience significant functional loading, making
thin composite extensions undesirable.
9. Which finding most strongly indicates that a proximal composite
restoration should be adjusted before final polishing?
A. Slightly matte surface
B. Premature occlusal contact detected with appropriate articulation evaluation
C. Proper marginal ridge height
D. Smooth proximal contour
Answer: Premature occlusal contact detected with appropriate articulation
evaluation
Rationale: Premature contacts can contribute to postoperative discomfort,
restoration fracture, or occlusal instability and should be corrected before final
polishing.
CRDTS Restorative Examination Practice
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
CRDTS Dental Licensing Exam Prep &
Study Guide
1. A posterior composite restoration has a deep proximal box and limited
access for light curing. Which technique most directly reduces the risk of
inadequate polymerization at the gingival margin?
A. Increase etching time
B. Place one large bulk increment
C. Use appropriately sized incremental placement with adequate curing from
accessible directions
D. Eliminate the bonding agent
Answer: Use appropriately sized incremental placement with adequate curing
from accessible directions
Rationale: Incremental placement reduces depth-related curing limitations and
allows better adaptation and light access, particularly in deep proximal
preparations.
, 2. During preparation of a Class II composite restoration, which feature is
most important for achieving predictable proximal contact?
A. Excessive occlusal convergence
B. Stable matrix adaptation against the adjacent tooth
C. Removal of all marginal ridge enamel
D. Extremely heavy wedging
Answer: Stable matrix adaptation against the adjacent tooth
Rationale: A properly adapted sectional or circumferential matrix establishes
the contour and contact relationship necessary for a functional proximal
contact.
3. A patient reports postoperative sensitivity after placement of a deep
posterior composite. The restoration is not high in occlusion. Which factor
is most likely to contribute?
A. Excessive fluoride exposure
B. Polymerization shrinkage and inadequate dentin sealing
C. Excessive polishing
D. Overcontoured enamel margins only
Answer: Polymerization shrinkage and inadequate dentin sealing
Rationale: Polymerization contraction can generate interfacial stress and
contribute to marginal leakage or postoperative sensitivity, particularly in deep
dentin.
4. When restoring a Class II lesion with a sectional matrix system, the wedge
primarily functions to:
A. Increase composite translucency
B. Prevent polymerization shrinkage
C. Adapt the matrix cervically and help compensate for the tooth–matrix
interface
D. Etch the proximal enamel
,Answer: Adapt the matrix cervically and help compensate for the tooth–matrix
interface
Rationale: The wedge provides cervical adaptation and helps prevent gingival
overhang while supporting proper proximal contour formation.
5. Which margin generally provides the most predictable bonding substrate
for an adhesive composite restoration?
A. Sclerotic dentin
B. Caries-affected dentin
C. Sound enamel
D. Contaminated dentin
Answer: Sound enamel
Rationale: Etched sound enamel provides a highly predictable micromechanical
bonding surface compared with dentin, especially sclerotic or contaminated
dentin.
6. A Class I composite preparation should generally preserve sound tooth
structure because:
A. Composite requires extensive mechanical retention
B. Adhesive dentistry allows retention with minimal removal of healthy tissue
C. Larger preparations prevent curing
D. Narrow preparations cannot be polished
Answer: Adhesive dentistry allows retention with minimal removal of healthy
tissue
Rationale: Modern adhesive restorations rely primarily on bonding rather than
traditional macromechanical retention.
7. Which clinical error most directly increases the risk of an open proximal
contact in a posterior composite restoration?
, A. Using a fine finishing diamond
B. Failure to adequately separate the teeth before matrix placement
C. Using a rubber dam
D. Applying a glycerin gel before curing
Answer: Failure to adequately separate the teeth before matrix placement
Rationale: Adequate pre-restorative separation allows the matrix to establish a
firm contact after removal of the separator or wedge.
8. Why is beveling generally avoided on the occlusal cavosurface margin of a
posterior stress-bearing composite restoration?
A. It prevents etching
B. It makes the tooth impossible to isolate
C. It may create a thin composite edge that is susceptible to fracture and wear
D. It eliminates bonding
Answer: It may create a thin composite edge that is susceptible to fracture and
wear
Rationale: Occlusal margins experience significant functional loading, making
thin composite extensions undesirable.
9. Which finding most strongly indicates that a proximal composite
restoration should be adjusted before final polishing?
A. Slightly matte surface
B. Premature occlusal contact detected with appropriate articulation evaluation
C. Proper marginal ridge height
D. Smooth proximal contour
Answer: Premature occlusal contact detected with appropriate articulation
evaluation
Rationale: Premature contacts can contribute to postoperative discomfort,
restoration fracture, or occlusal instability and should be corrected before final
polishing.
