Background: The study was conducted to evaluate the accuracy of a novel design computer- generated surgical guide template (SGT) using rapid prototyping to guide the osteotomy cuts in sandwich osteotomy technique according to the pre-planned position to prevent injury to the infe- rior alveolar nerve.   Methods: Eight partially edentulous patients showing atrophy in the posterior mandibular ridge were included. A SGT was designed according to each case using a 3D modeling software to guide the bony osteotomy cuts during the surgical procedure. Preoperative, immediate post-operative and after 4 months CBCT was done for all patients. Dental implants were installed at the grafted sites after 4 months. Results: Linear measurements were taken from the pre and post-operative CBCT. No statisti- cally significant difference was found between the pre and post-operative measurements (P ≤ 0.05). Conclusion: The computer generated SGT provided enhanced visualization, better treatment planning, predictable results and a less technique sensitive procedure.