This is the case of a 60-year-old patient who required implant rehabilitation in the posterior sector of the maxilla. Given the presence of an atrophic bone ridge, a two-stage surgical approach was chosen. In the first phase, post-extraction alveolar preservation of tooth #16 was performed using the Bartee technique, placing a bone graft in the alveolus and covering it with a non-resorbable polytetrafluoroethylene (PTFE) membrane to maintain graft stability. Closure was achieved with a 5-0 nylon cross suture. Seven months following the preservation and after a computed tomographic evaluation (CBCT), a vertical deficiency of the bone crest was identified that required a maxillary sinus elevation using the lateral window technique. The lateral sinus wall was accessed with piezoelectric instruments, a bony window was created, and the sinus membrane was carefully elevated. Bone graft material covered with a resorbable membrane was placed in the resulting space to facilitate healing and stability of the graft. This case highlights the importance of sequential management of atrophic ridge bone as a key factor in optimizing bone volume and enabling predictable dental implant placement, especially in anatomically compromised posterior maxillary regions.