Posterboard Displays Distraction osteogenesis maxillary expansion (DOME) improves nasal breathing and OSA Abstract This retrospective study involved 28 adult OSA patients who underwent DOME (Distraction Osteogenesis Maxillary Expansion) and evaluated the structural changes of skeletal and airway dimensions after DOME. Significant amount of skeletal expansion was observed (ANS: 8.4 mm; PNS: 2.1 mm; nasal floor: 5.0 mm) and all the sleep apnea indexes improved after DOME. In conclusion, DOME was effective in expanding the nasal cavity and further improving the sleep apnea severity in patients who have maxillary transverse deficiency. Highlights from the Annual Session It was a great experience presenting my project for the PCSO posterboard competition, and I had a productive discussion with professionals in the field. Taekeong Kim; H. Seo, A. Yoon, J. Park University of the Pacific Taekeong Kim Arthur A. Dugoni School of Dentistry University of the Pacific San Francisco, CA 60 PCSO Bulletin Winter 2019