Sinus Floor Elevation Magnitude and Longitudinal Peri-Implant Marginal Bone Change over a Minimum Five-Year Follow-Up: A Retrospective Cohort Study

Background/Objectives: The magnitude of maxillary sinus floor elevation may reflect site anatomy and surgical complexity, but its association with peri-implant marginal bone change remains unclear. This study evaluated whether elevation magnitude was associated with longitudinal peri-implant marginal bone-level change over a minimum 5-year follow-up, distinguishing immediate postoperative differences from subsequent change.