When the edentulous jaw resorbs over time, which jaw becomes BROADER (wider) in cross-section?

The mandible and maxilla resorb in opposite directions: The maxilla undergoes centripetal resorption — it resorbs inward and upward, becoming narrower and smaller. The mandible undergoes centrifugal resorption — it resorbs outward and downward, becoming broader and wider in cross-section. This is why edentulous patients often present with a cross-bite pattern when wearing complete dentures, and why in a fully edentulous patient the mandibular arch appears wider relative to the maxillary arch over time.