Vertical Bone Gain and Neurosensory Affection in Computer Guided vs Conventional Sandwich Osteotomy

Inclusion Criteria: * • Edentulous posterior mandibular ridge with vertical loss of alveolar bone with remaining bone height (4-7 mm) above the mandibular canal * Good oral hygiene * Highly motivated patients * Patients seeking fixed prosthesis at posterior mandibular region. * Patients willing for a surgical procedures follow-up with an informed consent * Age range 20-65 years Exclusion Criteria: * • Smokers * Individuals with dentulous posterior mandible ridge * Medically compromised patients * Patients with local pathosis at the surgical area suggested * Previously subjected to reconstructive procedures of the posterior mandible