INTEGRATED NATIONAL BOARD DENTAL EXAMINATION
(INBDE) FINAL EXAM NEWEST EXAM PREPARATION
WITH COMPLETE QUESTIONS AND CORRECT ANSWERS
WITH RATIONALES | ALREADY GRADED A+||BRAND
NEW VERSION!!
1. A patient presents with a mandibular first molar exhibiting spontaneous,
lingering pain to cold and heat. The pain persists after removal of the stimulus.
What is the most likely pulpal diagnosis?
A. Normal pulp
B. Reversible pulpitis
C. Symptomatic irreversible pulpitis
D. Pulp necrosis
Answer: C. Symptomatic irreversible pulpitis
Rationale: Lingering thermal pain and spontaneous pain are characteristic of
symptomatic irreversible pulpitis, indicating inflamed pulp tissue that is unlikely to
recover.
2. Which microorganism is most strongly associated with the initiation of dental
caries?
A. Porphyromonas gingivalis
B. Streptococcus mutans
C. Fusobacterium nucleatum
D. Treponema denticola
Answer: B. Streptococcus mutans
,Rationale: Streptococcus mutans is a major cariogenic bacterium because it
metabolizes fermentable carbohydrates, produces acid, and contributes to biofilm
formation.
3. A patient has generalized gingival inflammation, clinical attachment loss, and
radiographic alveolar bone loss. Which condition is most consistent with these
findings?
A. Gingivitis
B. Periodontitis
C. Periapical granuloma
D. Acute necrotizing ulcerative gingivitis
Answer: B. Periodontitis
Rationale: Periodontitis is characterized by inflammation associated with loss of
periodontal attachment and supporting alveolar bone.
4. Which cranial nerve provides the primary sensory innervation to the teeth?
A. Facial nerve
B. Glossopharyngeal nerve
C. Trigeminal nerve
D. Hypoglossal nerve
Answer: C. Trigeminal nerve
Rationale: The trigeminal nerve, cranial nerve V, provides sensory innervation to
the teeth through its maxillary and mandibular divisions.
5. A patient reports sharp pain when biting on a tooth but little or no
spontaneous pain. Which condition should be strongly suspected?
A. Cracked tooth
B. Pulp necrosis
,C. Chronic apical abscess
D. Hypercementosis
Answer: A. Cracked tooth
Rationale: Pain on biting or release of biting pressure is a classic clinical feature of
a cracked tooth, although pulpal and periodontal testing is necessary for
diagnosis.
6. Which restorative material releases fluoride and can chemically bond to tooth
structure?
A. Amalgam
B. Glass ionomer cement
C. Zinc phosphate cement
D. Composite resin
Answer: B. Glass ionomer cement
Rationale: Glass ionomer cement chemically bonds to enamel and dentin and
releases fluoride after placement.
7. Which vitamin deficiency is associated with impaired collagen synthesis and
poor wound healing?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
Answer: C. Vitamin C
Rationale: Vitamin C is required for hydroxylation of proline and lysine during
collagen synthesis. Deficiency can produce impaired wound healing and gingival
abnormalities.
, 8. A radiograph shows a well-defined, unilocular radiolucency associated with
the crown of an unerupted mandibular third molar. What is the most likely
diagnosis?
A. Radicular cyst
B. Dentigerous cyst
C. Periapical granuloma
D. Lateral periodontal cyst
Answer: B. Dentigerous cyst
Rationale: A dentigerous cyst characteristically surrounds the crown of an
unerupted tooth and attaches near the cemento-enamel junction.
9. Which cell is primarily responsible for resorption of alveolar bone?
A. Osteoblast
B. Osteocyte
C. Osteoclast
D. Fibroblast
Answer: C. Osteoclast
Rationale: Osteoclasts are multinucleated cells responsible for bone resorption.
10. Which local anesthetic is classified as an amide?
A. Procaine
B. Benzocaine
C. Tetracaine
D. Lidocaine
Answer: D. Lidocaine
Rationale: Lidocaine is an amide-type local anesthetic. Procaine, benzocaine, and
tetracaine are ester-type anesthetics.
(INBDE) FINAL EXAM NEWEST EXAM PREPARATION
WITH COMPLETE QUESTIONS AND CORRECT ANSWERS
WITH RATIONALES | ALREADY GRADED A+||BRAND
NEW VERSION!!
1. A patient presents with a mandibular first molar exhibiting spontaneous,
lingering pain to cold and heat. The pain persists after removal of the stimulus.
What is the most likely pulpal diagnosis?
A. Normal pulp
B. Reversible pulpitis
C. Symptomatic irreversible pulpitis
D. Pulp necrosis
Answer: C. Symptomatic irreversible pulpitis
Rationale: Lingering thermal pain and spontaneous pain are characteristic of
symptomatic irreversible pulpitis, indicating inflamed pulp tissue that is unlikely to
recover.
2. Which microorganism is most strongly associated with the initiation of dental
caries?
A. Porphyromonas gingivalis
B. Streptococcus mutans
C. Fusobacterium nucleatum
D. Treponema denticola
Answer: B. Streptococcus mutans
,Rationale: Streptococcus mutans is a major cariogenic bacterium because it
metabolizes fermentable carbohydrates, produces acid, and contributes to biofilm
formation.
3. A patient has generalized gingival inflammation, clinical attachment loss, and
radiographic alveolar bone loss. Which condition is most consistent with these
findings?
A. Gingivitis
B. Periodontitis
C. Periapical granuloma
D. Acute necrotizing ulcerative gingivitis
Answer: B. Periodontitis
Rationale: Periodontitis is characterized by inflammation associated with loss of
periodontal attachment and supporting alveolar bone.
4. Which cranial nerve provides the primary sensory innervation to the teeth?
A. Facial nerve
B. Glossopharyngeal nerve
C. Trigeminal nerve
D. Hypoglossal nerve
Answer: C. Trigeminal nerve
Rationale: The trigeminal nerve, cranial nerve V, provides sensory innervation to
the teeth through its maxillary and mandibular divisions.
5. A patient reports sharp pain when biting on a tooth but little or no
spontaneous pain. Which condition should be strongly suspected?
A. Cracked tooth
B. Pulp necrosis
,C. Chronic apical abscess
D. Hypercementosis
Answer: A. Cracked tooth
Rationale: Pain on biting or release of biting pressure is a classic clinical feature of
a cracked tooth, although pulpal and periodontal testing is necessary for
diagnosis.
6. Which restorative material releases fluoride and can chemically bond to tooth
structure?
A. Amalgam
B. Glass ionomer cement
C. Zinc phosphate cement
D. Composite resin
Answer: B. Glass ionomer cement
Rationale: Glass ionomer cement chemically bonds to enamel and dentin and
releases fluoride after placement.
7. Which vitamin deficiency is associated with impaired collagen synthesis and
poor wound healing?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
Answer: C. Vitamin C
Rationale: Vitamin C is required for hydroxylation of proline and lysine during
collagen synthesis. Deficiency can produce impaired wound healing and gingival
abnormalities.
, 8. A radiograph shows a well-defined, unilocular radiolucency associated with
the crown of an unerupted mandibular third molar. What is the most likely
diagnosis?
A. Radicular cyst
B. Dentigerous cyst
C. Periapical granuloma
D. Lateral periodontal cyst
Answer: B. Dentigerous cyst
Rationale: A dentigerous cyst characteristically surrounds the crown of an
unerupted tooth and attaches near the cemento-enamel junction.
9. Which cell is primarily responsible for resorption of alveolar bone?
A. Osteoblast
B. Osteocyte
C. Osteoclast
D. Fibroblast
Answer: C. Osteoclast
Rationale: Osteoclasts are multinucleated cells responsible for bone resorption.
10. Which local anesthetic is classified as an amide?
A. Procaine
B. Benzocaine
C. Tetracaine
D. Lidocaine
Answer: D. Lidocaine
Rationale: Lidocaine is an amide-type local anesthetic. Procaine, benzocaine, and
tetracaine are ester-type anesthetics.
