Marginal Ridge Function — NDEB AFK MCQ
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Correct answer: D — Protection of the interproximal contact and prevention of food impaction into the embrasure
Marginal ridges are elevated ridges of enamel on the mesial and distal borders of the occlusal surface of posterior teeth (and lingual surface of anterior teeth). They protect the interdental contact area and prevent food from being forced into the interproximal space (food impaction). Uneven marginal ridges between adjacent teeth create a plunger cusp effect, driving food interproximally. Restoration of marginal ridge height and contour is a critical goal in restorative dentistry to prevent food impaction and periodontal breakdown.
Reference: Ash – Wheeler's Dental Anatomy, Physiology, and Occlusion, 11th ed., 2020