NERB Dental Examination Practice
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
NERB Dental Licensing Exam Prep &
Study Guide
1.
A patient presents with a deep carious lesion on a mandibular first molar. The
tooth is asymptomatic, responds normally to cold testing, and there is no
percussion sensitivity. After caries removal, a small pulp exposure occurs. Which
finding most strongly supports vital pulp therapy rather than pulpectomy?
A. Spontaneous nocturnal pain
B. Lingering thermal pain lasting several minutes
C. Controlled bleeding from a small mechanical exposure
D. Periapical radiolucency
Answer: C. Controlled bleeding from a small mechanical exposure
,Rationale: A small mechanical pulp exposure in a tooth with a normal or
reversibly inflamed pulp and controllable hemorrhage can be managed with
vital pulp therapy. Spontaneous pain, prolonged lingering pain, or periapical
pathology suggests more advanced pulpal disease.
2.
During preparation of a Class II composite restoration, which factor is most critical
for achieving predictable proximal contact?
A. Increasing the curing time
B. Using a properly contoured sectional matrix with an adequate wedge
C. Etching dentin for 60 seconds
D. Placing flowable composite throughout the preparation
Answer: B. Using a properly contoured sectional matrix with an adequate
wedge
Rationale: A properly adapted sectional matrix and wedge establish proximal
contour, contact, and gingival adaptation. Polymerization variables cannot
compensate for an incorrectly positioned matrix.
3.
A patient has a maxillary complete denture with repeated fracture through the
midline. Which factor is most likely contributing to the fracture?
A. Excessive vertical dimension alone
B. Inadequate denture base thickness or poor fit
C. Excessive salivary flow
D. Increased residual ridge height
Answer: B. Inadequate denture base thickness or poor fit
,Rationale: Midline fracture is frequently associated with flexural fatigue caused
by inadequate thickness, poor adaptation, occlusal imbalance, or excessive ridge
resorption. Correcting the underlying mechanical problem is essential.
4.
Which local anesthetic characteristic generally increases the duration of pulpal
anesthesia?
A. Lower protein binding
B. Increased vasodilation
C. Addition of a vasoconstrictor
D. Decreased lipid solubility
Answer: C. Addition of a vasoconstrictor
Rationale: Vasoconstrictors reduce local blood flow, slowing systemic
absorption of the anesthetic and prolonging its local effect. They also reduce
peak plasma concentration and surgical bleeding.
5.
A patient develops a localized radiolucency between the roots of mandibular
molars. The tooth is vital and asymptomatic. Which lesion should be considered
particularly strongly?
A. Lateral periodontal cyst
B. Endodontic lesion
C. Traumatic bone cyst
D. Residual cyst
Answer: C. Traumatic bone cyst
, Rationale: A traumatic bone cyst may occur in the mandible of younger patients
and frequently appears as a scalloping radiolucency between roots while
associated teeth remain vital.
6.
Which periodontal finding provides the strongest evidence of active attachment
loss rather than simple gingival inflammation?
A. Gingival erythema
B. Bleeding on probing
C. Increased probing depth with clinical attachment loss
D. Gingival edema
Answer: C. Increased probing depth with clinical attachment loss
Rationale: Clinical attachment loss reflects destruction of periodontal supporting
tissues and is more directly associated with historical periodontal breakdown
than inflammatory signs alone.
7.
A mandibular molar has extensive coronal destruction but sufficient sound tooth
structure remains circumferentially above the gingival margin. Which restorative
principle is most important for long-term prognosis?
A. Eliminate all cusps
B. Establish adequate ferrule effect when a crown is indicated
C. Use the shortest possible post
D. Place the crown margin directly on the pulpal floor
Answer: B. Establish adequate ferrule effect when a crown is indicated
Exam 2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
NERB Dental Licensing Exam Prep &
Study Guide
1.
A patient presents with a deep carious lesion on a mandibular first molar. The
tooth is asymptomatic, responds normally to cold testing, and there is no
percussion sensitivity. After caries removal, a small pulp exposure occurs. Which
finding most strongly supports vital pulp therapy rather than pulpectomy?
A. Spontaneous nocturnal pain
B. Lingering thermal pain lasting several minutes
C. Controlled bleeding from a small mechanical exposure
D. Periapical radiolucency
Answer: C. Controlled bleeding from a small mechanical exposure
,Rationale: A small mechanical pulp exposure in a tooth with a normal or
reversibly inflamed pulp and controllable hemorrhage can be managed with
vital pulp therapy. Spontaneous pain, prolonged lingering pain, or periapical
pathology suggests more advanced pulpal disease.
2.
During preparation of a Class II composite restoration, which factor is most critical
for achieving predictable proximal contact?
A. Increasing the curing time
B. Using a properly contoured sectional matrix with an adequate wedge
C. Etching dentin for 60 seconds
D. Placing flowable composite throughout the preparation
Answer: B. Using a properly contoured sectional matrix with an adequate
wedge
Rationale: A properly adapted sectional matrix and wedge establish proximal
contour, contact, and gingival adaptation. Polymerization variables cannot
compensate for an incorrectly positioned matrix.
3.
A patient has a maxillary complete denture with repeated fracture through the
midline. Which factor is most likely contributing to the fracture?
A. Excessive vertical dimension alone
B. Inadequate denture base thickness or poor fit
C. Excessive salivary flow
D. Increased residual ridge height
Answer: B. Inadequate denture base thickness or poor fit
,Rationale: Midline fracture is frequently associated with flexural fatigue caused
by inadequate thickness, poor adaptation, occlusal imbalance, or excessive ridge
resorption. Correcting the underlying mechanical problem is essential.
4.
Which local anesthetic characteristic generally increases the duration of pulpal
anesthesia?
A. Lower protein binding
B. Increased vasodilation
C. Addition of a vasoconstrictor
D. Decreased lipid solubility
Answer: C. Addition of a vasoconstrictor
Rationale: Vasoconstrictors reduce local blood flow, slowing systemic
absorption of the anesthetic and prolonging its local effect. They also reduce
peak plasma concentration and surgical bleeding.
5.
A patient develops a localized radiolucency between the roots of mandibular
molars. The tooth is vital and asymptomatic. Which lesion should be considered
particularly strongly?
A. Lateral periodontal cyst
B. Endodontic lesion
C. Traumatic bone cyst
D. Residual cyst
Answer: C. Traumatic bone cyst
, Rationale: A traumatic bone cyst may occur in the mandible of younger patients
and frequently appears as a scalloping radiolucency between roots while
associated teeth remain vital.
6.
Which periodontal finding provides the strongest evidence of active attachment
loss rather than simple gingival inflammation?
A. Gingival erythema
B. Bleeding on probing
C. Increased probing depth with clinical attachment loss
D. Gingival edema
Answer: C. Increased probing depth with clinical attachment loss
Rationale: Clinical attachment loss reflects destruction of periodontal supporting
tissues and is more directly associated with historical periodontal breakdown
than inflammatory signs alone.
7.
A mandibular molar has extensive coronal destruction but sufficient sound tooth
structure remains circumferentially above the gingival margin. Which restorative
principle is most important for long-term prognosis?
A. Eliminate all cusps
B. Establish adequate ferrule effect when a crown is indicated
C. Use the shortest possible post
D. Place the crown margin directly on the pulpal floor
Answer: B. Establish adequate ferrule effect when a crown is indicated
