My thesis explores different aspects of sinus lift surgery and its alternatives. It emphasizes the role of sinus lift surgery in dental rehabilitation and its techniques, including direct sinus lift, indirect sinus lift, and other minimally invasive techniques. Furthermore, it discusses the indications, contraindications, and the potential complications of the surgery and their management. Additionally, the different types of bone grafts utilized for sinus lift surgery are also explored. Finally, the thesis also investigates the various alternatives of sinus lift surgery, including short implants, zygomatic implants, trans-sinus implants, tilted implants, pterygoid implants, and onlay bone grafting.