Rehabilitation of the posterior maxilla with dental implants is often limited by reduced residual bone height due to maxillary sinus pneumatization. Transcrestal hydraulic sinus lift is a minimally invasive technique used to elevate the Schneiderian membrane and promote bone formation. While graftless approaches have shown predictable results, the additional regenerative benefit of synthetic bone graft materials remains unclear. Low Crystalline Apatite Resorbable (LCR) graft is a novel synthetic bone substitute designed to mimic the crystallinity of natural bone and promote controlled resorption and new bone formation. This clinical trial aims to evaluate and compare bone volume gain following sinus floor augmentation performed with transcrestal hydraulic lift alone and with LCR graft placement during simultaneous implant insertion. A total of 30 patients will be randomly allocated into two groups (n=15 each). Radiographic assessment of vertical bone height will be performed at baseline, 6 months, and 9 months using RVG and CBCT. The study seeks to determine whether the addition of LCR graft provides superior bone volume gain compared to graftless hydraulic sinus elevation, thereby optimizing minimally invasive sinus augmentation protocols for implant placement.