Background: Open sinus lift is indicated in posterior maxilla when subantral bone is insufficient for insertion of dental implants. Lateral approach is the most used technique. Sometimes. this surgery is difficult due to thick buccal bone or other anatomic variations of maxillary sinus. https://www.roneverhart.com/ASUS-VivoBook-X515-15-6-FHD-Laptop-Intel-Core-i5-1135G7-2-4-GHz-Intel-Iris-Xe-Graphics-16GB-DDR4-RAM-1TB-SSD-Windows-/