DENTAL OSCE EXAM 2026–2027 | (200 QUESTIONS AND CORRECT
ANSWERS) | ALREADY GRADED A+ | 100% VERIFIED
Dentistry & Clinical Dental Sciences | National Dental Examining Boards (e.g., NDEB, CDCA, ADEX)
Key Domains: Clinical Diagnosis, Treatment Planning, Radiographic Interpretation, Infection Control, Patient Communication,
Medical Emergencies, and Dental Pharmacology | Expert-Aligned Structure | Exam-Ready Format
Introduction
This structured DENTAL OSCE EXAM format for 2026–2027 provides the complete layout for generating high-quality exam-style
questions with correct answers and rationales. It emphasizes foundational clinical dental principles, evidence-based treatment
protocols, patient safety and infection control standards, and critical diagnostic reasoning essential for professional dental practice
and successful national board licensure.
Answer Format
All correct answers must appear in bold and cyan, accompanied by concise rationales explaining safety/clinical reasoning,
protocol adherence, and why alternative options are less appropriate. STRICT RANDOMIZATION PROTOCOL: The placement of the
correct choice (A, B, C, or D) MUST be strictly and unpredictably randomized for every single question. Do not use predictable
patterns, avoid consecutive identical letters, and ensure an even distribution across all options to guarantee an authentic exam
simulation.
1. A 45-year-old patient presents with a painless, slow-growing, firm swelling on the palate. Radiograph shows a well-
defined radiolucency with sclerotic borders. The most likely diagnosis is:
A. Ameloblastoma
B. Periapical abscess
C. Nasopalatine duct cyst
D. Squamous cell carcinoma
Correct Answer: C. Nasopalatine duct cyst
Rationale: Nasopalatine duct cyst is the most common non-odontogenic cyst, often presenting as a midline palatal swelling with a
well-corticated radiolucency.
2. Which of the following is the most common malignant tumor of the oral cavity?
A. Adenoid cystic carcinoma
B. Mucoepidermoid carcinoma
C. Squamous cell carcinoma
D. Basal cell carcinoma
Correct Answer: C. Squamous cell carcinoma
,Rationale: Squamous cell carcinoma accounts for over 90% of oral malignancies, most commonly on the lateral tongue and floor of
mouth.
3. A patient has a white, non-scrapable lesion on the buccal mucosa that cannot be wiped off. This is most consistent
with:
A. Lichen planus (reticular)
B. Leukoplakia
C. Thermal burn
D. Pseudomembranous candidiasis
Correct Answer: B. Leukoplakia
Rationale: Leukoplakia is defined as a white patch that cannot be scraped off and is not attributable to any other disease; it is
potentially malignant.
4. The most common location for an odontogenic keratocyst (OKC) is:
A. Maxillary sinus
B. Posterior mandible
C. Anterior maxilla
D. Anterior mandible
Correct Answer: B. Posterior mandible
Rationale: OKCs most frequently occur in the posterior mandible, often associated with an impacted third molar, and have a high
recurrence rate.
5. A 6-year-old child presents with multiple small, round, white papules on the palate. The most likely diagnosis is:
A. Aphthous ulcers
B. Fordyce granules
C. Epstein pearls (Bohn nodules)
D. Herpes simplex
Correct Answer: C. Epstein pearls (Bohn nodules)
Rationale: Epstein pearls are benign keratin cysts commonly seen on the palate of newborns and infants.
6. Which condition is characterized by bilateral, asymptomatic, yellowish-white papules on the buccal mucosa?
A. Fordyce granules
B. Leukoplakia
C. Candidiasis
D. Lichen planus
Correct Answer: A. Fordyce granules
Rationale: Fordyce granules are ectopic sebaceous glands appearing as small yellowish papules, most commonly on the buccal
mucosa.
,7. A patient with a history of heavy smoking presents with a red patch on the floor of the mouth. This is most
suggestive of:
A. Erythroplakia
B. Median rhomboid glossitis
C. Geographic tongue
D. Leukoplakia
Correct Answer: A. Erythroplakia
Rationale: Erythroplakia is a red patch that cannot be diagnosed as any other condition and carries a high risk of malignant
transformation.
8. The most common cause of a radiolucent lesion at the apex of a non-vital tooth is:
A. Residual cyst
B. Dentigerous cyst
C. Radicular (periapical) cyst
D. Odontogenic keratocyst
Correct Answer: C. Radicular (periapical) cyst
Rationale: Radicular cysts form from epithelial remnants in a periapical granuloma secondary to pulp necrosis.
9. A patient reports a history of recurrent painful ulcers on the tongue and buccal mucosa that heal in 7-10 days. The
most likely diagnosis is:
A. Recurrent aphthous stomatitis (minor)
B. Primary herpes
C. Pemphigus vulgaris
D. Herpetic gingivostomatitis
Correct Answer: A. Recurrent aphthous stomatitis (minor)
Rationale: Minor aphthous ulcers are the most common, typically 2-4 mm, painful, and heal within 7-14 days without scarring.
10. Which of the following is a characteristic radiographic feature of a dentigerous cyst?
A. Multilocular radiolucency crossing the midline
B. Mixed radiopaque-radiolucent lesion
C. Well-defined radiolucency surrounding the crown of an unerupted tooth
D. Periapical radiolucency on a vital tooth
Correct Answer: C. Well-defined radiolucency surrounding the crown of an unerupted tooth
Rationale: Dentigerous cysts are associated with the crown of an unerupted tooth (commonly mandibular third molars) and
appear as a unilocular radiolucency.
11. A firm, asymptomatic, bony hard swelling on the midline of the palate in a 30-year-old is most likely:
, A. Pleomorphic adenoma
B. Torus palatinus
C. Nasopalatine cyst
D. Squamous cell carcinoma
Correct Answer: B. Torus palatinus
Rationale: Torus palatinus is a common developmental bony exostosis in the midline of the hard palate.
12. The Nikolsky sign is positive in which condition?
A. Leukoplakia
B. Herpes labialis
C. Recurrent aphthous stomatitis
D. Pemphigus vulgaris
Correct Answer: D. Pemphigus vulgaris
Rationale: Nikolsky sign (sloughing of epithelium with pressure) is characteristic of pemphigus vulgaris and other vesiculobullous
diseases.
13. A 25-year-old presents with a firm, mobile, asymptomatic swelling in the anterior floor of the mouth. Histology
shows mucous extravasation. Diagnosis:
A. Dermoid cyst
B. Sialolith
C. Pleomorphic adenoma
D. Mucocele (ranula)
Correct Answer: D. Mucocele (ranula)
Rationale: Mucocele (especially ranula when in floor of mouth) results from trauma to a minor salivary gland duct causing mucous
extravasation.
14. Which oral lesion is strongly associated with HIV infection?
A. Fordyce granules
B. Torus palatinus
C. Oral hairy leukoplakia
D. Leukoplakia
Correct Answer: C. Oral hairy leukoplakia
Rationale: Oral hairy leukoplakia is caused by EBV and is almost pathognomonic for HIV/AIDS, appearing as corrugated white
plaques on the lateral tongue.
15. A patient has a history of burning sensation on the tongue and bilateral white striae on the buccal mucosa. Most
likely diagnosis:
A. Leukoplakia
ANSWERS) | ALREADY GRADED A+ | 100% VERIFIED
Dentistry & Clinical Dental Sciences | National Dental Examining Boards (e.g., NDEB, CDCA, ADEX)
Key Domains: Clinical Diagnosis, Treatment Planning, Radiographic Interpretation, Infection Control, Patient Communication,
Medical Emergencies, and Dental Pharmacology | Expert-Aligned Structure | Exam-Ready Format
Introduction
This structured DENTAL OSCE EXAM format for 2026–2027 provides the complete layout for generating high-quality exam-style
questions with correct answers and rationales. It emphasizes foundational clinical dental principles, evidence-based treatment
protocols, patient safety and infection control standards, and critical diagnostic reasoning essential for professional dental practice
and successful national board licensure.
Answer Format
All correct answers must appear in bold and cyan, accompanied by concise rationales explaining safety/clinical reasoning,
protocol adherence, and why alternative options are less appropriate. STRICT RANDOMIZATION PROTOCOL: The placement of the
correct choice (A, B, C, or D) MUST be strictly and unpredictably randomized for every single question. Do not use predictable
patterns, avoid consecutive identical letters, and ensure an even distribution across all options to guarantee an authentic exam
simulation.
1. A 45-year-old patient presents with a painless, slow-growing, firm swelling on the palate. Radiograph shows a well-
defined radiolucency with sclerotic borders. The most likely diagnosis is:
A. Ameloblastoma
B. Periapical abscess
C. Nasopalatine duct cyst
D. Squamous cell carcinoma
Correct Answer: C. Nasopalatine duct cyst
Rationale: Nasopalatine duct cyst is the most common non-odontogenic cyst, often presenting as a midline palatal swelling with a
well-corticated radiolucency.
2. Which of the following is the most common malignant tumor of the oral cavity?
A. Adenoid cystic carcinoma
B. Mucoepidermoid carcinoma
C. Squamous cell carcinoma
D. Basal cell carcinoma
Correct Answer: C. Squamous cell carcinoma
,Rationale: Squamous cell carcinoma accounts for over 90% of oral malignancies, most commonly on the lateral tongue and floor of
mouth.
3. A patient has a white, non-scrapable lesion on the buccal mucosa that cannot be wiped off. This is most consistent
with:
A. Lichen planus (reticular)
B. Leukoplakia
C. Thermal burn
D. Pseudomembranous candidiasis
Correct Answer: B. Leukoplakia
Rationale: Leukoplakia is defined as a white patch that cannot be scraped off and is not attributable to any other disease; it is
potentially malignant.
4. The most common location for an odontogenic keratocyst (OKC) is:
A. Maxillary sinus
B. Posterior mandible
C. Anterior maxilla
D. Anterior mandible
Correct Answer: B. Posterior mandible
Rationale: OKCs most frequently occur in the posterior mandible, often associated with an impacted third molar, and have a high
recurrence rate.
5. A 6-year-old child presents with multiple small, round, white papules on the palate. The most likely diagnosis is:
A. Aphthous ulcers
B. Fordyce granules
C. Epstein pearls (Bohn nodules)
D. Herpes simplex
Correct Answer: C. Epstein pearls (Bohn nodules)
Rationale: Epstein pearls are benign keratin cysts commonly seen on the palate of newborns and infants.
6. Which condition is characterized by bilateral, asymptomatic, yellowish-white papules on the buccal mucosa?
A. Fordyce granules
B. Leukoplakia
C. Candidiasis
D. Lichen planus
Correct Answer: A. Fordyce granules
Rationale: Fordyce granules are ectopic sebaceous glands appearing as small yellowish papules, most commonly on the buccal
mucosa.
,7. A patient with a history of heavy smoking presents with a red patch on the floor of the mouth. This is most
suggestive of:
A. Erythroplakia
B. Median rhomboid glossitis
C. Geographic tongue
D. Leukoplakia
Correct Answer: A. Erythroplakia
Rationale: Erythroplakia is a red patch that cannot be diagnosed as any other condition and carries a high risk of malignant
transformation.
8. The most common cause of a radiolucent lesion at the apex of a non-vital tooth is:
A. Residual cyst
B. Dentigerous cyst
C. Radicular (periapical) cyst
D. Odontogenic keratocyst
Correct Answer: C. Radicular (periapical) cyst
Rationale: Radicular cysts form from epithelial remnants in a periapical granuloma secondary to pulp necrosis.
9. A patient reports a history of recurrent painful ulcers on the tongue and buccal mucosa that heal in 7-10 days. The
most likely diagnosis is:
A. Recurrent aphthous stomatitis (minor)
B. Primary herpes
C. Pemphigus vulgaris
D. Herpetic gingivostomatitis
Correct Answer: A. Recurrent aphthous stomatitis (minor)
Rationale: Minor aphthous ulcers are the most common, typically 2-4 mm, painful, and heal within 7-14 days without scarring.
10. Which of the following is a characteristic radiographic feature of a dentigerous cyst?
A. Multilocular radiolucency crossing the midline
B. Mixed radiopaque-radiolucent lesion
C. Well-defined radiolucency surrounding the crown of an unerupted tooth
D. Periapical radiolucency on a vital tooth
Correct Answer: C. Well-defined radiolucency surrounding the crown of an unerupted tooth
Rationale: Dentigerous cysts are associated with the crown of an unerupted tooth (commonly mandibular third molars) and
appear as a unilocular radiolucency.
11. A firm, asymptomatic, bony hard swelling on the midline of the palate in a 30-year-old is most likely:
, A. Pleomorphic adenoma
B. Torus palatinus
C. Nasopalatine cyst
D. Squamous cell carcinoma
Correct Answer: B. Torus palatinus
Rationale: Torus palatinus is a common developmental bony exostosis in the midline of the hard palate.
12. The Nikolsky sign is positive in which condition?
A. Leukoplakia
B. Herpes labialis
C. Recurrent aphthous stomatitis
D. Pemphigus vulgaris
Correct Answer: D. Pemphigus vulgaris
Rationale: Nikolsky sign (sloughing of epithelium with pressure) is characteristic of pemphigus vulgaris and other vesiculobullous
diseases.
13. A 25-year-old presents with a firm, mobile, asymptomatic swelling in the anterior floor of the mouth. Histology
shows mucous extravasation. Diagnosis:
A. Dermoid cyst
B. Sialolith
C. Pleomorphic adenoma
D. Mucocele (ranula)
Correct Answer: D. Mucocele (ranula)
Rationale: Mucocele (especially ranula when in floor of mouth) results from trauma to a minor salivary gland duct causing mucous
extravasation.
14. Which oral lesion is strongly associated with HIV infection?
A. Fordyce granules
B. Torus palatinus
C. Oral hairy leukoplakia
D. Leukoplakia
Correct Answer: C. Oral hairy leukoplakia
Rationale: Oral hairy leukoplakia is caused by EBV and is almost pathognomonic for HIV/AIDS, appearing as corrugated white
plaques on the lateral tongue.
15. A patient has a history of burning sensation on the tongue and bilateral white striae on the buccal mucosa. Most
likely diagnosis:
A. Leukoplakia
