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In cases where severe bone resorption has occurred due to periodontitis or when a tooth has been extracted due to instability caused by the maxillary sinus, the alveolar bone is often thin. If a tooth has been missing for a long time, this condition worsens. Sinus lift surgery is a procedure that strengthens and thickens the upper jawbone when there is insufficient maxillary bone, ensuring that the implant can be securely placed.