Figures 4–7. Figures 4 and 5. Combination syndrome (CS) case of partially edentulous maxilla and mandible: unopposed mandibular anterior teeth are super-erupted towards the atrophic premaxillary bone. Panoramic radiograph showing the bone remodeling changes of the alveolar process common for CS: resorption of anterior maxilla (treated with 2 endosseous implants) and right posterior mandible. A bone atrophy of the left mandible and a bone hypertrophy of the left maxilla are mild due to preserved teeth in a stable occlusal relationship. A bone atrophy of the right mandible and a bone hypertrophy of the right maxilla (with teeth extrusion) are pronounced due to lack of mandibular posterior teeth and posterior occlusion (occlusal pairing). Measurements of the mandibular body height from the alveolar crest to the inferior border of the mandible on equal distances from the midline at the first molar position: 26 mm (taken as 100%) on the left and 20 mm (relative 20% bone height reduction) on the right due to CS-associated atrophic changes. The patient has been wearing upper and lower removable partial dentures for the past 25 years. CS classification: Class II, Mod. 3 (II-3). Figure 6. Thin and resorbed anterior maxillary ridge with mobile hypertrophic tissue and papillary hyperplasia of the alveolar mucosa. Figure 7. O-ring attachment on the mesial extension of the No. 12-13-14 PFM bridge.