Evaluation of Horizontal Bone Gain in the Lower Posterior Partially Edentulous Patient Comparing the Stabilization of Membranes With and Without Tacs

Inclusion Criteria: * Patients with at least 1 missing tooth in the posterior mandibular area Patients with an age above 18 years Systemically healthy patients Healed alveolar ridge for implant placement with: * Deficient buccolingual dimension ( ≤5mm) * Sufficient vertical height (≥ 10 mm) * Sufficient mesio-distal width (≥ 6.5 mm) Inter-arch space ≥ 7 mm to allow space for implant-supported crown Presence of neighboring and opposing dentition Soft tissue phenotype with keratinized tissue width (KTW) (≥2 mm) and gingival thickness (≥2 mm) Good oral hygiene Cooperative patients who accepted the trial follow up period and sign the informed consen Exclusion Criteria: * Systemic diseases or medications that might affect bone metabolism, increase surgical risk or complicate post-operative healing Untreated periodontal diseases History of radiation therapy to the head and neck Heavy smokers (≥ 10 cigarettes per day) Pregnant or lactating females Alcoholism or drug abuse Psychiatric problems Patients with signs of acute infection related to the area of interest