Mandibular ridge splitting with complete separation of the buccal cortical plate versus Khoury shell technique for horizontal augmentation of atrophic posterior mandible

Inclusion Criteria:

• Patients with atrophic mandible with residual bone width 3 to 4 mm.
• Both sexes.
• No intraoral soft and hard tissue pathology
• No systemic condition that contraindicate implant placement.

Exclusion Criteria:

• • Any pathology in the posterior mandible.

  • Heavy smokers more than 20 cigarettes per day.
  • Patients with systemic disease that may affect normal healing.
  • Psychiatric problems
  • Disorders to implant are related to history of radiation therapy to the head and neck neoplasia, or bone augmentation to implant site.