Single Crown Supported by Short Implant Versus Standard Implant in Conjunction With Maxillary Sinus Floor Augmentation.

The primary objective of the present study is to test the H0 hypothesis of: 1. No differences in survival of suprastructures and implants with the two treatment modalities. 2. No differences in peri-implant MBL, PES, WES, and patient satisfaction using VAS with the two treat modalities. 3. No differences in oral health related quality of life using OHIP-14 with the two treatment modalities. The secondary objective will include: 1\. Complications related to bone harvesting, implant installation, and MSFA. The primary outcome measures included: * Survival of suprastructures. * Survival of implants. * Radiographic peri-implant MBL. * Professional evaluation of suprastructure and soft tissue using PES and WES. * Patient satisfaction using VAS * Oral health related quality of life using OHIP-14 questionnaire. Secondary outcome measures: • Pre- and postoperative complications.