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CRDTS Prosthodontic Examination
Practice Exam 2026 | 100 Advanced
Questions & Answers with Detailed
Rationales | CRDTS Dental Licensing
Exam Prep & Study Guide
1. A patient presents with a severely worn maxillary dentition and requires a
complete coverage restoration on tooth #8. Which factor is most critical
when determining the minimum occlusal reduction for a lithium disilicate
crown?
A. Gingival biotype
B. Root length
C. Material thickness required for structural durability
D. Shade selection
Answer: Material thickness required for structural durability
,Rationale: Adequate occlusal reduction is dictated primarily by the restorative
material's minimum thickness requirements to resist fracture and maintain long-
term strength.
2. During preparation for a full cast crown, excessive taper of opposing axial
walls most significantly compromises:
A. Marginal adaptation
B. Occlusal clearance
C. Resistance form
D. Proximal contact
Answer: Resistance form
Rationale: Excessive convergence decreases resistance form by reducing the
preparation's ability to withstand lateral and rotational dislodging forces.
3. Which finish line is generally most appropriate for an all-ceramic anterior
crown fabricated from lithium disilicate?
A. Knife edge
B. Chamfer
C. Deep rounded shoulder
D. Feather edge
Answer: Deep rounded shoulder
Rationale: A rounded shoulder provides adequate ceramic bulk while minimizing
stress concentration within the restoration.
4. A provisional crown exhibits marginal leakage after one week. Which factor
is the most likely cause?
A. Excessive polishing
,B. Thick occlusal anatomy
C. Inadequate marginal adaptation
D. Over-contoured proximal contact
Answer: Inadequate marginal adaptation
Rationale: Poor adaptation allows bacterial infiltration and fluid movement
beneath the provisional restoration.
5. The primary objective of resistance form in crown preparation is to resist:
A. Thermal expansion
B. Cement dissolution
C. Oblique and lateral dislodging forces
D. Marginal staining
Answer: Oblique and lateral dislodging forces
Rationale: Resistance form prevents displacement caused by lateral or rotational
forces during mastication.
6. A patient requires restoration of a mandibular first molar with significant
functional load. Which restorative material generally demonstrates the
greatest fracture toughness?
A. Feldspathic porcelain
B. Composite resin
C. Lithium disilicate
D. Monolithic zirconia
Answer: Monolithic zirconia
, Rationale: Monolithic zirconia possesses exceptional fracture resistance and is
commonly indicated for posterior high-load restorations.
7. When evaluating an occlusal reduction for a porcelain-fused-to-metal
crown, inadequate facial reduction most commonly results in:
A. Increased retention
B. Over-contoured restoration
C. Improved esthetics
D. Reduced cement thickness
Answer: Over-contoured restoration
Rationale: Insufficient reduction forces the technician to create excessive contour
to accommodate both metal and porcelain thickness.
8. Which principle best explains why preparations with parallel axial walls
demonstrate excellent retention?
A. Resistance to wear
B. Increased occlusal reduction
C. Greater frictional retention
D. Improved esthetic contour
Answer: Greater frictional retention
Rationale: Parallel walls maximize surface contact and friction between the
preparation and restoration, enhancing retention.
9. A clinician is preparing a tooth for a crown with minimal remaining coronal
structure. Which auxiliary feature most improves resistance?
A. Larger shoulder
B. Wider occlusal table
CRDTS Prosthodontic Examination
Practice Exam 2026 | 100 Advanced
Questions & Answers with Detailed
Rationales | CRDTS Dental Licensing
Exam Prep & Study Guide
1. A patient presents with a severely worn maxillary dentition and requires a
complete coverage restoration on tooth #8. Which factor is most critical
when determining the minimum occlusal reduction for a lithium disilicate
crown?
A. Gingival biotype
B. Root length
C. Material thickness required for structural durability
D. Shade selection
Answer: Material thickness required for structural durability
,Rationale: Adequate occlusal reduction is dictated primarily by the restorative
material's minimum thickness requirements to resist fracture and maintain long-
term strength.
2. During preparation for a full cast crown, excessive taper of opposing axial
walls most significantly compromises:
A. Marginal adaptation
B. Occlusal clearance
C. Resistance form
D. Proximal contact
Answer: Resistance form
Rationale: Excessive convergence decreases resistance form by reducing the
preparation's ability to withstand lateral and rotational dislodging forces.
3. Which finish line is generally most appropriate for an all-ceramic anterior
crown fabricated from lithium disilicate?
A. Knife edge
B. Chamfer
C. Deep rounded shoulder
D. Feather edge
Answer: Deep rounded shoulder
Rationale: A rounded shoulder provides adequate ceramic bulk while minimizing
stress concentration within the restoration.
4. A provisional crown exhibits marginal leakage after one week. Which factor
is the most likely cause?
A. Excessive polishing
,B. Thick occlusal anatomy
C. Inadequate marginal adaptation
D. Over-contoured proximal contact
Answer: Inadequate marginal adaptation
Rationale: Poor adaptation allows bacterial infiltration and fluid movement
beneath the provisional restoration.
5. The primary objective of resistance form in crown preparation is to resist:
A. Thermal expansion
B. Cement dissolution
C. Oblique and lateral dislodging forces
D. Marginal staining
Answer: Oblique and lateral dislodging forces
Rationale: Resistance form prevents displacement caused by lateral or rotational
forces during mastication.
6. A patient requires restoration of a mandibular first molar with significant
functional load. Which restorative material generally demonstrates the
greatest fracture toughness?
A. Feldspathic porcelain
B. Composite resin
C. Lithium disilicate
D. Monolithic zirconia
Answer: Monolithic zirconia
, Rationale: Monolithic zirconia possesses exceptional fracture resistance and is
commonly indicated for posterior high-load restorations.
7. When evaluating an occlusal reduction for a porcelain-fused-to-metal
crown, inadequate facial reduction most commonly results in:
A. Increased retention
B. Over-contoured restoration
C. Improved esthetics
D. Reduced cement thickness
Answer: Over-contoured restoration
Rationale: Insufficient reduction forces the technician to create excessive contour
to accommodate both metal and porcelain thickness.
8. Which principle best explains why preparations with parallel axial walls
demonstrate excellent retention?
A. Resistance to wear
B. Increased occlusal reduction
C. Greater frictional retention
D. Improved esthetic contour
Answer: Greater frictional retention
Rationale: Parallel walls maximize surface contact and friction between the
preparation and restoration, enhancing retention.
9. A clinician is preparing a tooth for a crown with minimal remaining coronal
structure. Which auxiliary feature most improves resistance?
A. Larger shoulder
B. Wider occlusal table
