INBDE (INTEGRATED NATIONAL BOARD
DENTAL EXAMINATION) QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
2024/2025
1. A 25-year-old patient presents with pain and swelling in the lower right jaw.
Clinically, tooth #30 is tender to percussion and does not respond to vitality
testing. Radiograph shows a periapical radiolucency. What is the most
appropriate treatment?
A. Extraction of tooth #30
B. Root canal therapy on tooth #30
C. Scaling and root planing
D. Antibiotic therapy only
Rationale: The symptoms suggest pulp necrosis with periapical pathology. The
best treatment is root canal therapy to eliminate the source of infection while
preserving the tooth.
2. Which of the following bacteria is most commonly associated with dental
caries?
,A. Actinomyces viscosus
B. Streptococcus mutans
C. Lactobacillus casei
D. Porphyromonas gingivalis
Rationale: Streptococcus mutans is a primary etiological agent in dental caries
due to its acidogenic and aciduric properties.
3. Which permanent tooth is most commonly congenitally missing?
A. Maxillary lateral incisor
B. Mandibular second premolar
C. Maxillary canine
D. Mandibular first molar
Rationale: After third molars, the mandibular second premolars are the most
commonly congenitally missing teeth.
4. A patient is allergic to penicillin. Which antibiotic is the best alternative for a
dental infection?
A. Amoxicillin
B. Clindamycin
C. Cephalexin
D. Erythromycin
, Rationale: Clindamycin is preferred due to its effectiveness against anaerobic
organisms common in dental infections and its safety in penicillin-allergic
patients.
5. A 4-year-old child has white spot lesions on maxillary anterior teeth. Which of
the following is the most likely cause?
A. Eruption hypoplasia
B. Early childhood caries
C. Amelogenesis imperfecta
D. Tetracycline staining
Rationale: Early childhood caries (ECC) often affects maxillary anterior teeth due
to prolonged bottle feeding or sugary liquids at bedtime.
6. Which radiograph provides the best view of the zygomatic arch?
A. Periapical
B. Panoramic
C. Submentovertex (SMV)
D. Water’s view
Rationale: SMV view is ideal for evaluating the zygomatic arch and base of the
skull.
7. Which of the following is an ethical principle that involves doing no harm?
DENTAL EXAMINATION) QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
2024/2025
1. A 25-year-old patient presents with pain and swelling in the lower right jaw.
Clinically, tooth #30 is tender to percussion and does not respond to vitality
testing. Radiograph shows a periapical radiolucency. What is the most
appropriate treatment?
A. Extraction of tooth #30
B. Root canal therapy on tooth #30
C. Scaling and root planing
D. Antibiotic therapy only
Rationale: The symptoms suggest pulp necrosis with periapical pathology. The
best treatment is root canal therapy to eliminate the source of infection while
preserving the tooth.
2. Which of the following bacteria is most commonly associated with dental
caries?
,A. Actinomyces viscosus
B. Streptococcus mutans
C. Lactobacillus casei
D. Porphyromonas gingivalis
Rationale: Streptococcus mutans is a primary etiological agent in dental caries
due to its acidogenic and aciduric properties.
3. Which permanent tooth is most commonly congenitally missing?
A. Maxillary lateral incisor
B. Mandibular second premolar
C. Maxillary canine
D. Mandibular first molar
Rationale: After third molars, the mandibular second premolars are the most
commonly congenitally missing teeth.
4. A patient is allergic to penicillin. Which antibiotic is the best alternative for a
dental infection?
A. Amoxicillin
B. Clindamycin
C. Cephalexin
D. Erythromycin
, Rationale: Clindamycin is preferred due to its effectiveness against anaerobic
organisms common in dental infections and its safety in penicillin-allergic
patients.
5. A 4-year-old child has white spot lesions on maxillary anterior teeth. Which of
the following is the most likely cause?
A. Eruption hypoplasia
B. Early childhood caries
C. Amelogenesis imperfecta
D. Tetracycline staining
Rationale: Early childhood caries (ECC) often affects maxillary anterior teeth due
to prolonged bottle feeding or sugary liquids at bedtime.
6. Which radiograph provides the best view of the zygomatic arch?
A. Periapical
B. Panoramic
C. Submentovertex (SMV)
D. Water’s view
Rationale: SMV view is ideal for evaluating the zygomatic arch and base of the
skull.
7. Which of the following is an ethical principle that involves doing no harm?
