Facial Proportions Lower Third — NDEB AFK MCQ

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ModerateProsthodonticsFacial Proportions Lower ThirdNDEB AFK

A properly proportioned face has the lower third of the face (nose base to chin) divided into which proportions by the lip line?

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Correct answer: C — Upper one-third (nose to lip line) and lower two-thirds (lip line to chin)

In a properly proportioned face (based on classical aesthetic proportions), the lower third of the face (subnasale to menton) is divided by the lip line (stomion) into approximately upper one-third (subnasale to stomion) and lower two-thirds (stomion to menton). This relationship is important in prosthodontics for establishing correct vertical dimension of occlusion and anterior tooth position. Excessive OVD shortens the upper lip segment; insufficient OVD increases it. Tooth position should restore approximately 2-3 mm of upper incisor display below the resting upper lip.

Reference: Zarb – Prosthodontic Treatment for Edentulous Patients, 13th ed., 2013