Pericoronitis Trismus — NDEB AFK MCQ
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Correct answer: A — Trismus (limited mouth opening) from inflammation spreading to the masticator space
Trismus (limited mouth opening due to masticatory muscle inflammation/spasm) is a hallmark clinical sign of pericoronitis that distinguishes it from simple dental pain. The inflammation from the infected operculum spreads to the pterygomandibular space and masticator space, causing spasm of the medial pterygoid and masseter muscles. Other distinguishing features include swelling of the pericoronal tissues, purulent discharge from under the operculum, dysphagia, lymphadenopathy, and possible fever.
Reference: Hupp – Contemporary Oral and Maxillofacial Surgery, 7th ed., 2019