INBDE Full-Length Mock Exam 2026 |
100 Advanced Questions & Answers
with Detailed Rationales | Integrated
National Board Dental Examination
Prep & Study Guide
Q1. Diagnosis & Treatment Planning
A 52-year-old patient reports spontaneous, lingering pain to cold in the
mandibular first molar. The tooth is not tender to percussion, and the radiograph
shows no periapical radiolucency. Which pulpal diagnosis is most appropriate?
A. Reversible pulpitis
B. Symptomatic apical periodontitis
C. Asymptomatic irreversible pulpitis
D. Symptomatic irreversible pulpitis
Answer: Symptomatic irreversible pulpitis
Rationale: Spontaneous pain and a lingering response to thermal stimulation
indicate significant pulpal inflammation that is unlikely to resolve after removal
,of the irritant. The absence of percussion sensitivity or a periapical lesion does
not exclude irreversible pulpitis.
Q2. Pharmacology
A patient taking warfarin requires extraction of a mandibular molar. Which
analgesic is generally the most appropriate first-line choice when clinically
feasible?
A. Aspirin
B. Ibuprofen
C. Acetaminophen
D. Ketorolac
Answer: Acetaminophen
Rationale: NSAIDs can increase bleeding risk through platelet inhibition and
gastrointestinal effects and may interact with anticoagulant therapy.
Acetaminophen is generally preferred for short-term analgesia, although
excessive doses can cause hepatotoxicity.
Q3. Periodontics
A patient has generalized periodontal pockets of 6–7 mm, bleeding on probing,
horizontal bone loss, and furcation involvement of mandibular first molars.
Following initial periodontal therapy, several sites remain at 7 mm with
subgingival calculus. What is the most appropriate next step?
A. Discontinue periodontal treatment
B. Surgical periodontal therapy at residual deep sites
C. Prescribe systemic antibiotics alone
D. Perform only coronal polishing
Answer: Surgical periodontal therapy at residual deep sites
,Rationale: Persistent deep pockets with residual subgingival deposits after
nonsurgical therapy may require access for thorough debridement and
reduction of pocket depth. Systemic antibiotics alone do not eliminate the local
etiologic factors.
Q4. Endodontics
A maxillary lateral incisor is nonresponsive to cold and electric pulp testing. The
tooth is asymptomatic, and a well-defined apical radiolucency is present. What is
the most appropriate diagnosis?
A. Pulp necrosis with asymptomatic apical periodontitis
B. Reversible pulpitis
C. Symptomatic irreversible pulpitis
D. Normal pulp with chronic apical abscess
Answer: Pulp necrosis with asymptomatic apical periodontitis
Rationale: Lack of pulp sensibility indicates necrosis, while a localized apical
radiolucency without symptoms is consistent with asymptomatic apical
periodontitis.
Q5. Oral Pathology
A 60-year-old patient presents with a persistent nonhealing ulcer on the lateral
border of the tongue. The lesion is indurated and has been present for 4 weeks.
What is the most appropriate management?
A. Reassurance and observation
B. Topical corticosteroid therapy
C. Biopsy or prompt referral for biopsy
D. Antifungal therapy
Answer: Biopsy or prompt referral for biopsy
, Rationale: A persistent, indurated ulcer on a high-risk oral site is suspicious for
oral squamous cell carcinoma. Persistence beyond approximately 2 weeks
without an identifiable reversible cause warrants biopsy or specialist evaluation.
Q6. Pediatric Dentistry
A 7-year-old has a deep carious lesion approaching the pulp of a primary
mandibular second molar. The tooth has no spontaneous pain, no swelling, and
no abnormal mobility. Radiographically, there is no furcation pathology. What is
the preferred conservative treatment?
A. Extraction
B. Indirect pulp treatment
C. Pulpectomy in every case
D. Permanent crown placement without caries removal
Answer: Indirect pulp treatment
Rationale: In a vital primary tooth with deep caries but no clinical or
radiographic evidence of irreversible pulpal pathology, indirect pulp treatment
preserves the tooth while minimizing the risk of pulp exposure.
Q7. Prosthodontics
For a mandibular complete denture, which factor contributes most directly to
denture stability during function?
A. Maximizing the vertical dimension
B. Properly extending the denture base within functional limits
C. Eliminating all posterior contacts
D. Reducing the denture base area
Answer: Properly extending the denture base within functional limits
100 Advanced Questions & Answers
with Detailed Rationales | Integrated
National Board Dental Examination
Prep & Study Guide
Q1. Diagnosis & Treatment Planning
A 52-year-old patient reports spontaneous, lingering pain to cold in the
mandibular first molar. The tooth is not tender to percussion, and the radiograph
shows no periapical radiolucency. Which pulpal diagnosis is most appropriate?
A. Reversible pulpitis
B. Symptomatic apical periodontitis
C. Asymptomatic irreversible pulpitis
D. Symptomatic irreversible pulpitis
Answer: Symptomatic irreversible pulpitis
Rationale: Spontaneous pain and a lingering response to thermal stimulation
indicate significant pulpal inflammation that is unlikely to resolve after removal
,of the irritant. The absence of percussion sensitivity or a periapical lesion does
not exclude irreversible pulpitis.
Q2. Pharmacology
A patient taking warfarin requires extraction of a mandibular molar. Which
analgesic is generally the most appropriate first-line choice when clinically
feasible?
A. Aspirin
B. Ibuprofen
C. Acetaminophen
D. Ketorolac
Answer: Acetaminophen
Rationale: NSAIDs can increase bleeding risk through platelet inhibition and
gastrointestinal effects and may interact with anticoagulant therapy.
Acetaminophen is generally preferred for short-term analgesia, although
excessive doses can cause hepatotoxicity.
Q3. Periodontics
A patient has generalized periodontal pockets of 6–7 mm, bleeding on probing,
horizontal bone loss, and furcation involvement of mandibular first molars.
Following initial periodontal therapy, several sites remain at 7 mm with
subgingival calculus. What is the most appropriate next step?
A. Discontinue periodontal treatment
B. Surgical periodontal therapy at residual deep sites
C. Prescribe systemic antibiotics alone
D. Perform only coronal polishing
Answer: Surgical periodontal therapy at residual deep sites
,Rationale: Persistent deep pockets with residual subgingival deposits after
nonsurgical therapy may require access for thorough debridement and
reduction of pocket depth. Systemic antibiotics alone do not eliminate the local
etiologic factors.
Q4. Endodontics
A maxillary lateral incisor is nonresponsive to cold and electric pulp testing. The
tooth is asymptomatic, and a well-defined apical radiolucency is present. What is
the most appropriate diagnosis?
A. Pulp necrosis with asymptomatic apical periodontitis
B. Reversible pulpitis
C. Symptomatic irreversible pulpitis
D. Normal pulp with chronic apical abscess
Answer: Pulp necrosis with asymptomatic apical periodontitis
Rationale: Lack of pulp sensibility indicates necrosis, while a localized apical
radiolucency without symptoms is consistent with asymptomatic apical
periodontitis.
Q5. Oral Pathology
A 60-year-old patient presents with a persistent nonhealing ulcer on the lateral
border of the tongue. The lesion is indurated and has been present for 4 weeks.
What is the most appropriate management?
A. Reassurance and observation
B. Topical corticosteroid therapy
C. Biopsy or prompt referral for biopsy
D. Antifungal therapy
Answer: Biopsy or prompt referral for biopsy
, Rationale: A persistent, indurated ulcer on a high-risk oral site is suspicious for
oral squamous cell carcinoma. Persistence beyond approximately 2 weeks
without an identifiable reversible cause warrants biopsy or specialist evaluation.
Q6. Pediatric Dentistry
A 7-year-old has a deep carious lesion approaching the pulp of a primary
mandibular second molar. The tooth has no spontaneous pain, no swelling, and
no abnormal mobility. Radiographically, there is no furcation pathology. What is
the preferred conservative treatment?
A. Extraction
B. Indirect pulp treatment
C. Pulpectomy in every case
D. Permanent crown placement without caries removal
Answer: Indirect pulp treatment
Rationale: In a vital primary tooth with deep caries but no clinical or
radiographic evidence of irreversible pulpal pathology, indirect pulp treatment
preserves the tooth while minimizing the risk of pulp exposure.
Q7. Prosthodontics
For a mandibular complete denture, which factor contributes most directly to
denture stability during function?
A. Maximizing the vertical dimension
B. Properly extending the denture base within functional limits
C. Eliminating all posterior contacts
D. Reducing the denture base area
Answer: Properly extending the denture base within functional limits
