INTEGRATED NATIONAL BOARD DENTAL
EXAMINATION (INBDE) QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. A patient presents with reversible pulpitis. What is the most appropriate
treatment?
A. Root canal therapy
B. Extraction
C. Remove caries and restore
D. Antibiotics only
Correct Answer: C
Rationale: Reversible pulpitis is inflammation that can heal once the
irritant (usually caries) is removed. Restorative treatment prevents
progression to irreversible pulpitis.
2. Which microorganism is most associated with dental caries?
A. Streptococcus mutans
B. Staphylococcus aureus
C. Candida albicans
D. Escherichia coli
Correct Answer: A
Rationale: Streptococcus mutans metabolizes sugars into acids, leading to
enamel demineralization and caries formation.
3. The primary function of enamel is:
A. Nutrient supply
, B. Protection of dentin
C. Pain transmission
D. Bone attachment
Correct Answer: B
Rationale: Enamel is the hardest tissue in the body and protects
underlying dentin from mechanical and chemical damage.
4. Which nerve innervates maxillary teeth?
A. Mandibular nerve
B. Facial nerve
C. Maxillary nerve (V2)
D. Glossopharyngeal nerve
Correct Answer: C
Rationale: The maxillary division of the trigeminal nerve (V2) provides
sensory innervation to maxillary teeth.
5. A Class II cavity involves:
A. Incisal edge
B. Occlusal surface only
C. Proximal surfaces of posterior teeth
D. Cervical third of anterior teeth
Correct Answer: C
Rationale: Class II cavities affect the proximal surfaces of premolars and
molars.
6. The most common cause of periodontal disease is:
A. Viral infection
B. Plaque biofilm
C. Trauma
D. Genetic mutation
Correct Answer: B
Rationale: Dental plaque containing bacteria is the primary etiologic
factor in periodontal disease.
, 7. Which vitamin deficiency is associated with scurvy?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
Correct Answer: C
Rationale: Vitamin C deficiency impairs collagen synthesis, leading to
bleeding gums and poor wound healing.
8. The temporomandibular joint is classified as:
A. Hinge joint only
B. Ball and socket
C. Saddle joint
D. Modified hinge and gliding joint
Correct Answer: D
Rationale: The TMJ allows both hinge and sliding movements, making it a
modified hinge joint.
9. The hardest substance in the human body is:
A. Dentin
B. Cementum
C. Enamel
D. Bone
Correct Answer: C
Rationale: Enamel has the highest mineral content, making it the hardest
tissue.
10.Which anesthetic is most commonly used in dentistry?
A. Lidocaine
B. Aspirin
C. Amoxicillin
D. Epinephrine alone
Correct Answer: A
EXAMINATION (INBDE) QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. A patient presents with reversible pulpitis. What is the most appropriate
treatment?
A. Root canal therapy
B. Extraction
C. Remove caries and restore
D. Antibiotics only
Correct Answer: C
Rationale: Reversible pulpitis is inflammation that can heal once the
irritant (usually caries) is removed. Restorative treatment prevents
progression to irreversible pulpitis.
2. Which microorganism is most associated with dental caries?
A. Streptococcus mutans
B. Staphylococcus aureus
C. Candida albicans
D. Escherichia coli
Correct Answer: A
Rationale: Streptococcus mutans metabolizes sugars into acids, leading to
enamel demineralization and caries formation.
3. The primary function of enamel is:
A. Nutrient supply
, B. Protection of dentin
C. Pain transmission
D. Bone attachment
Correct Answer: B
Rationale: Enamel is the hardest tissue in the body and protects
underlying dentin from mechanical and chemical damage.
4. Which nerve innervates maxillary teeth?
A. Mandibular nerve
B. Facial nerve
C. Maxillary nerve (V2)
D. Glossopharyngeal nerve
Correct Answer: C
Rationale: The maxillary division of the trigeminal nerve (V2) provides
sensory innervation to maxillary teeth.
5. A Class II cavity involves:
A. Incisal edge
B. Occlusal surface only
C. Proximal surfaces of posterior teeth
D. Cervical third of anterior teeth
Correct Answer: C
Rationale: Class II cavities affect the proximal surfaces of premolars and
molars.
6. The most common cause of periodontal disease is:
A. Viral infection
B. Plaque biofilm
C. Trauma
D. Genetic mutation
Correct Answer: B
Rationale: Dental plaque containing bacteria is the primary etiologic
factor in periodontal disease.
, 7. Which vitamin deficiency is associated with scurvy?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
Correct Answer: C
Rationale: Vitamin C deficiency impairs collagen synthesis, leading to
bleeding gums and poor wound healing.
8. The temporomandibular joint is classified as:
A. Hinge joint only
B. Ball and socket
C. Saddle joint
D. Modified hinge and gliding joint
Correct Answer: D
Rationale: The TMJ allows both hinge and sliding movements, making it a
modified hinge joint.
9. The hardest substance in the human body is:
A. Dentin
B. Cementum
C. Enamel
D. Bone
Correct Answer: C
Rationale: Enamel has the highest mineral content, making it the hardest
tissue.
10.Which anesthetic is most commonly used in dentistry?
A. Lidocaine
B. Aspirin
C. Amoxicillin
D. Epinephrine alone
Correct Answer: A
