Posselt Envelope of Motion — NDEB AFK MCQ
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Correct answer: C — The maximum three-dimensional border movements of the mandible in the sagittal plane
Posselt's envelope of motion (Ulf Posselt, 1952) describes the maximum three-dimensional border movements of the mandible as viewed in the sagittal plane. The envelope is bounded by: centric relation (most retruded position) superiorly and posteriorly, maximum opening inferiorly, maximum protrusion anteriorly, and maximum intercuspation within the envelope. All functional jaw movements occur within this envelope. It is a fundamental concept in prosthodontic diagnosis and treatment planning.
Reference: Okeson – Management of Temporomandibular Disorders, 8th ed., 2019