INBDE Oral Medicine and Oral Pathology 2

Question 1

Which odontogenic cyst has the highest recurrence rate due to an aggressive, thin-walled epithelial lining that produces keratin?

Accepted Answer

Odontogenic keratocyst

Answer

The odontogenic keratocyst (OKC) has a high recurrence rate (25–60%) because its thin, friable parakeratinized epithelial lining is prone to incomplete removal and satellite cyst formation.

Question 2

A patient presents with multiple basal cell carcinomas, calcified falx cerebri, and odontogenic keratocysts of the jaw. What syndrome is present?

Accepted Answer

Gorlin-Goltz syndrome

Answer

Gorlin-Goltz (nevoid basal cell carcinoma) syndrome is characterized by multiple OKCs of the jaws, basal cell nevi/carcinomas, and calcification of the falx cerebri.

Question 3

Which type of lichen planus carries the highest risk of malignant transformation?

Accepted Answer

Erosive lichen planus

Answer

Erosive (atrophic/ulcerative) lichen planus has the greatest malignant potential among lichen planus variants, with an estimated 0.5–2% risk of transformation to squamous cell carcinoma.

Question 4

A painless, slow-growing mass at the angle of the mandible in a 60-year-old is found to contain perineural invasion on biopsy. Which salivary gland tumor is most likely?

Accepted Answer

Adenoid cystic carcinoma

Answer

Adenoid cystic carcinoma is notorious for perineural invasion and spread, explaining pain or facial nerve symptoms despite its deceptively slow growth.

Question 5

Which bone disease presents radiographically as a 'ground glass' or 'orange peel' appearance and results from replacement of normal bone with fibrous connective tissue?

Accepted Answer

Fibrous dysplasia

Answer

Fibrous dysplasia replaces normal medullary bone with fibrous connective tissue containing woven bone trabeculae, producing the classic ground-glass radiographic pattern.

INBDE - Integrated National Board Dental Exam Practice Test

INBDE - Integrated National Board Dental Exam Practice Test

INBDE Oral Medicine and Oral Pathology 2