One-step Approach for Radicular Cyst Removal in the Maxillary Sinus and Implant Placement in the Posterior Maxilla: A Case Report with a 3-Year Follow-Up

A 39-year-old woman with a large radicular cyst in their left maxillary sinus desired implant treatment in the area of tooth #25 and #26. The cyst was carefully removed using a lateral window approach. During the removal, the sinus membrane next to the cyst also partially removed. Two implants were then placed, measuring Ø4.3 × 8 mm at #25 and Ø4.8 × 8 mm at #26. Due to insufficient bone height in those areas, the implants extended into the sinus floor. The implant protrusion into the sinus measured 3.0 mm at #25 and 0.5 mm at #26. No bone substitute material was used in the sinus. The healing after the surgery went smoothly. After a three-year follow-up, the protruding part of the implant was completely covered by newly formed bone, and there was no evidence of the cyst returning. This case report demonstrates that removing a radicular cyst and placing an implant simultaneously is possible with careful patient selection.