This case report describes staged implant rehabilitation in a patient with severe posterior maxillary bone loss caused by chronic odontogenic sinusitis. Initial management included incision, drainage, and pharmacologic therapy to control infection. Reconstruction was performed using an autogenous ramal bone block with a press-fit fixation technique. After a five-month healing period, implants were placed, followed by final prosthetic restoration after three months of osseointegration. This case demonstrates that predictable functional outcomes can be achieved through a structured, multidisciplinary approach integrating sinus management and press-fit bone grafting, even in complex cases with significant bone deficiency.

Daewoo Kim completed his bachelor’s degree at the University of Illinois Urbana-Champaign, USA, and his master’s degree at Seoul National University School of Dentistry, Korea. He is currently practicing comprehensive dentistry at Seoul Good Dental Hospital in Cheongju.