Atrophic alveolar bone presents a unique difficulty, preventing correct implant placement and affecting long-term results. There are different techniques that are recommended to restore the proper length of the posterior ridge of the mandible and thus achieve proper form and function, one of those is distraction osteogenesis. Refinements in the technique of distraction can improve the treatment outcome and decrease postoperative complications.

Inclusion Criteria:

• Patients with the posterior atrophic mandible.
• The distance from the alveolar crest to the upper border of the canal is not less than 5 mm.
• Adult patients from 30-60 years old with no gender predilection who agreed to present for follow-up visits for a minimum postoperative period of 4 months.
• Patientswithanadequateoralhygiene.
• The patient should be psychologically accepting of the involved procedures.

Exclusion Criteria:

• Medically compromised patients contradicting operation (ASA III, IV & V).
• Patients receiving radiotherapy or chemotherapy or bisphosphonate.
• Bonediseases(Osteoporosis,Osteopetrosis,Osteomalacia...etc.)
• Any habits that might retard healing such as heavy smoking and alcoholism.
• A history of any grafting procedure at the designated area.