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Pell and Gregory Classification — NDEB AFK MCQ

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ModerateOral SurgeryPell and Gregory ClassificationNDEB AFK

In the Pell and Gregory classification of mandibular third molar impactions, Class II indicates which relationship?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: B — Part of the third molar crown is covered by the anterior border of the ramus

Explanation lettering: D = shown as B · B = shown as D

Pell and Gregory Class II indicates that the impacted third molar is partially covered by the anterior border of the mandibular ramus (i.e., part of the crown extends posterior to the ramus border). Class I means the molar is entirely anterior to the ramus (adequate space). Class III means the molar is completely within the ramus (no space). The depth positions (A, B, C) relate to the occlusal plane of the second molar.

Reference: Hupp – Contemporary Oral and Maxillofacial Surgery, 7th ed., 2019