INBDE Clinical Sciences Practice Exam
2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
Integrated National Board Dental
Examination Prep & Study Guide
1.
A 42-year-old patient presents with a mandibular first molar that has a large
existing restoration. The tooth is asymptomatic but demonstrates a narrow,
isolated 8-mm periodontal probing depth on the buccal surface. Radiographs
show no obvious periapical lesion. Which diagnosis should be strongly
considered?
A. Generalized chronic periodontitis
B. Vertical root fracture
C. Primary endodontic lesion
D. Occlusal trauma
Answer: B. Vertical root fracture
Rationale: A narrow, isolated deep periodontal defect adjacent to an
endodontically treated or heavily restored tooth is highly suggestive of a vertical
,root fracture. A fracture may permit periodontal pathogens to track along the
root surface even when conventional radiographs do not show a definitive
fracture.
2.
A patient reports sharp pain to cold in a maxillary first molar. The pain persists for
approximately 30 seconds after the stimulus is removed. The tooth is not tender
to percussion. What is the most likely pulpal diagnosis?
A. Reversible pulpitis
B. Pulpal necrosis
C. Symptomatic irreversible pulpitis
D. Asymptomatic irreversible pulpitis
Answer: C. Symptomatic irreversible pulpitis
Rationale: Lingering thermal pain, particularly when spontaneous or difficult to
localize, is characteristic of symptomatic irreversible pulpitis. Reversible pulpitis
generally produces brief pain that resolves rapidly after removal of the stimulus.
3.
A patient has a mandibular first molar with spontaneous pain and pain on biting.
Radiographically, there is a periapical radiolucency. Cold testing produces no
response. What is the most appropriate pulpal and apical diagnosis?
A. Reversible pulpitis with normal apical tissues
B. Pulpal necrosis with symptomatic apical periodontitis
C. Symptomatic irreversible pulpitis with acute apical abscess
D. Pulpal necrosis with chronic apical abscess
Answer: B. Pulpal necrosis with symptomatic apical periodontitis
,Rationale: Lack of response to cold indicates pulpal necrosis, while pain on
biting/percussion indicates symptomatic apical periodontitis. A chronic apical
abscess would typically involve a draining sinus tract and often minimal
symptoms.
4.
A patient presents with a fluctuant swelling adjacent to a nonvital mandibular
molar, fever, malaise, and lymphadenopathy. What is the most appropriate
management?
A. Antibiotics alone
B. Extraction or endodontic drainage plus appropriate supportive management
C. Occlusal adjustment only
D. Delay treatment until swelling resolves
Answer: B. Extraction or endodontic drainage plus appropriate supportive
management
Rationale: A localized odontogenic infection with systemic involvement requires
elimination of the source through drainage, endodontic treatment, or extraction
when indicated. Antibiotics are adjunctive rather than a substitute for source
control.
5.
A 55-year-old patient has generalized periodontal probing depths of 5–7 mm,
bleeding on probing, and radiographic horizontal bone loss. Which finding would
most strongly indicate periodontitis rather than gingivitis?
A. Gingival erythema
B. Gingival bleeding
C. Clinical attachment loss
D. Plaque accumulation
, Answer: C. Clinical attachment loss
Rationale: Periodontitis is characterized by loss of periodontal supporting
tissues, clinically manifested by attachment loss and radiographic alveolar bone
loss. Gingivitis is limited to inflammation without attachment loss caused by
periodontal destruction.
6.
A patient has a 6-mm periodontal pocket with subgingival calculus and persistent
bleeding after nonsurgical periodontal therapy. Which treatment is most
appropriate if adequate oral hygiene has been established?
A. No further treatment
B. Surgical periodontal therapy when indicated
C. Systemic antibiotics as the sole treatment
D. Immediate extraction
Answer: B. Surgical periodontal therapy when indicated
Rationale: Persistent deep pockets after appropriate nonsurgical therapy may
require periodontal surgery to improve access for root debridement and, in
selected defects, facilitate regenerative procedures.
7.
A mandibular molar has furcation involvement extending horizontally into the
furcation but not through to the opposite side. Which classification best describes
this finding?
A. Grade I
B. Grade II
C. Grade III
D. Grade IV
2026 | 100 Advanced Questions &
Answers with Detailed Rationales |
Integrated National Board Dental
Examination Prep & Study Guide
1.
A 42-year-old patient presents with a mandibular first molar that has a large
existing restoration. The tooth is asymptomatic but demonstrates a narrow,
isolated 8-mm periodontal probing depth on the buccal surface. Radiographs
show no obvious periapical lesion. Which diagnosis should be strongly
considered?
A. Generalized chronic periodontitis
B. Vertical root fracture
C. Primary endodontic lesion
D. Occlusal trauma
Answer: B. Vertical root fracture
Rationale: A narrow, isolated deep periodontal defect adjacent to an
endodontically treated or heavily restored tooth is highly suggestive of a vertical
,root fracture. A fracture may permit periodontal pathogens to track along the
root surface even when conventional radiographs do not show a definitive
fracture.
2.
A patient reports sharp pain to cold in a maxillary first molar. The pain persists for
approximately 30 seconds after the stimulus is removed. The tooth is not tender
to percussion. What is the most likely pulpal diagnosis?
A. Reversible pulpitis
B. Pulpal necrosis
C. Symptomatic irreversible pulpitis
D. Asymptomatic irreversible pulpitis
Answer: C. Symptomatic irreversible pulpitis
Rationale: Lingering thermal pain, particularly when spontaneous or difficult to
localize, is characteristic of symptomatic irreversible pulpitis. Reversible pulpitis
generally produces brief pain that resolves rapidly after removal of the stimulus.
3.
A patient has a mandibular first molar with spontaneous pain and pain on biting.
Radiographically, there is a periapical radiolucency. Cold testing produces no
response. What is the most appropriate pulpal and apical diagnosis?
A. Reversible pulpitis with normal apical tissues
B. Pulpal necrosis with symptomatic apical periodontitis
C. Symptomatic irreversible pulpitis with acute apical abscess
D. Pulpal necrosis with chronic apical abscess
Answer: B. Pulpal necrosis with symptomatic apical periodontitis
,Rationale: Lack of response to cold indicates pulpal necrosis, while pain on
biting/percussion indicates symptomatic apical periodontitis. A chronic apical
abscess would typically involve a draining sinus tract and often minimal
symptoms.
4.
A patient presents with a fluctuant swelling adjacent to a nonvital mandibular
molar, fever, malaise, and lymphadenopathy. What is the most appropriate
management?
A. Antibiotics alone
B. Extraction or endodontic drainage plus appropriate supportive management
C. Occlusal adjustment only
D. Delay treatment until swelling resolves
Answer: B. Extraction or endodontic drainage plus appropriate supportive
management
Rationale: A localized odontogenic infection with systemic involvement requires
elimination of the source through drainage, endodontic treatment, or extraction
when indicated. Antibiotics are adjunctive rather than a substitute for source
control.
5.
A 55-year-old patient has generalized periodontal probing depths of 5–7 mm,
bleeding on probing, and radiographic horizontal bone loss. Which finding would
most strongly indicate periodontitis rather than gingivitis?
A. Gingival erythema
B. Gingival bleeding
C. Clinical attachment loss
D. Plaque accumulation
, Answer: C. Clinical attachment loss
Rationale: Periodontitis is characterized by loss of periodontal supporting
tissues, clinically manifested by attachment loss and radiographic alveolar bone
loss. Gingivitis is limited to inflammation without attachment loss caused by
periodontal destruction.
6.
A patient has a 6-mm periodontal pocket with subgingival calculus and persistent
bleeding after nonsurgical periodontal therapy. Which treatment is most
appropriate if adequate oral hygiene has been established?
A. No further treatment
B. Surgical periodontal therapy when indicated
C. Systemic antibiotics as the sole treatment
D. Immediate extraction
Answer: B. Surgical periodontal therapy when indicated
Rationale: Persistent deep pockets after appropriate nonsurgical therapy may
require periodontal surgery to improve access for root debridement and, in
selected defects, facilitate regenerative procedures.
7.
A mandibular molar has furcation involvement extending horizontally into the
furcation but not through to the opposite side. Which classification best describes
this finding?
A. Grade I
B. Grade II
C. Grade III
D. Grade IV
