Objective: This study was conducted to evaluate the vertical bone gain after augmentation of posterior mandibular ridge by use of composite autogenous and artificial bone graft with a preparatory stage of soft tissue expansion. Methods: Eight consecutive patients were randomly selected requiring posterior mandibular ridge augmentation, Silicone urinary catheters (1) were used as soft tissue expanders, urinary catheters size 16 (diameter 5.3mm) were used in all cases and surgical sites. Eight weeks later, bone augmentation by grafting by composite artificial Cerasorb (B-tricalcium phosphate) and autogenous chin bone graft was carried out. Cone beam CT (CBCT) was taken preoperative, immediate and six months postoperative to evaluate bone height gain. Results: All the 10 surgical sites in our 8 participating patients have had bone gain in a measure of few millimeters in vertical dimension which range from (2.80 mm) to (4.90 mm) with mean vertical bone gain of (3.95 ± 0.59 mm) as measured by CBCT. Conclusion: This staged ridge augmentation method is safe, effective, well tolerated by the patients and cost-efficient when compared to other augmentation methods in cases where few millimeters of added bone is sufficient.