When an edentulous maxillary arch (complete upper denture) is opposed by a natural mandibular dentition (retained lower anterior teeth only), what specific pattern of bone resorption and tissue changes occurs?

Combination Syndrome (Kelly's syndrome) describes a characteristic pattern of oral changes that occurs when a complete maxillary denture opposes a partially edentulous mandible retaining only the anterior teeth. The syndrome involves: (1) loss of bone from the anterior maxilla (where the denture contacts the natural lower anterior teeth), (2) overgrowth of the tuberosities, (3) papillary hyperplasia of the hard palate, (4) extrusion of the remaining lower anterior teeth, and (5) bone loss beneath the posterior mandibular denture base. The combination of increased forces from the natural lower anteriors against the denture-bearing anterior maxilla causes preferential anterior maxillary resorption — creating a distinctive pattern distinct from generalized edentulous resorption.