The aim of this study was to assess splitting and spreading of atrophic ridges to place dental implants. It was to detect any significant difference in bone gain before and after ridge splitting. The study used twelve implants to replace missing upper posterior teeth. The patients were chosen from the outpatient clinic of the Oral medicine, Oral Diagnosis and periodontology department, Cairo University. All patients were medically free, with no pathological conditions in the jaw bones. The edentulous sites were deficient in the horizontal dimension, requiring augmentation. All patients received implants after a ridge splitting procedure. The split crest procedure involved the use of piezoelectric tips to perform the bone cuts and chisels to widen the bone. Aresorbable collagen membrane (BIOCOLLAGEN®) was used to cover the implants. Radiographic assessment was performed at 3 intervals preoperative, immediately postoperative and 6 months postoperatively. Assessment included the amount of bone gain in width, the stability of the results after a period of6 months, and marginal bone loss around the implant. CBVT was used to acquire there measurements, by cross-sectional and longitudinal cuts. The statistical analysis revealed significant increase in bone width after ridge splitting and spreading.