Computer Guided Modified Ridge Splitting Versus Free Hand Technique in Horizontal Deficiency in Posterior Mandible

Inclusion Criteria: * posterior mandible with horizontal deficient alveolar ridge that is from 2 to 4 mm measured from the crest of the alveolar ridge buccolingually * Age range from 25-55 years. No sex predilection. * Patients free from any systemic conditions and bone metabolism diseases that might interfere with the surgical intervention, soft tissue or hard tissue healing. * Patients of adequate alveolar bone width. * Both genders males and females will be included * Normal vertical dimension with normal inter-arch space. The minimum number of missing teeth in the posterior mandible alveolar ridge is two adjacent anterior teeth Exclusion Criteria: * Intra-bony lesions (e.g. cysts) or infections (e.g. abscess) that may retard the osteotomy healing. * Previous grafting procedures in the edentulous area. * General contraindications to implant surgery. * Subjected to irradiation in the head and neck area less than 1 year before implantation. * Untreated periodontitis. * Poor oral hygiene and motivation. * Uncontrolled diabetes. * Pregnant or nursing. * Immunosuppressed or immunocompromised * Heavy smokers * Patients undergo medication interfere with bone healing