NBDHE Oral Pathology and Disease Recognition 3

Question 1

Which autoimmune disease causes bilateral, reticular white striations on the buccal mucosa known as Wickham's striae?

Accepted Answer

Lichen planus

Answer

Oral lichen planus classically presents as bilateral, interlacing white lines (Wickham's striae) on the buccal mucosa.

Question 2

Nikolsky's sign, elicited by rubbing normal-appearing mucosa to produce a blister, is positive in which condition?

Accepted Answer

Pemphigus vulgaris

Answer

Pemphigus vulgaris involves autoantibodies against desmogleins, causing intraepithelial separation and a positive Nikolsky's sign.

Question 3

A radiolucent lesion associated with the crown of an unerupted tooth is most likely a:

Accepted Answer

Dentigerous cyst

Answer

Dentigerous (follicular) cysts form by expansion of the follicular space around the crown of an unerupted tooth.

Question 4

Which oral lesion is described as a dome-shaped, fluctuant blue swelling of the floor of the mouth resulting from a ruptured salivary gland duct?

Accepted Answer

Ranula

Answer

A ranula is a mucous retention phenomenon of the sublingual gland that presents as a translucent blue swelling on the floor of the mouth.

Question 5

Amelogenesis imperfecta primarily affects which tooth structure?

Accepted Answer

Enamel

Answer

Amelogenesis imperfecta is a hereditary defect of enamel formation affecting enamel quantity or quality without systemic disease.

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