Clinical and Radiographic Evaluation of Using Regular Versus Narrow Diameter Dental Implantto Support Mandibular Complete Over Denture

Inclusion Criteria: . All patients should be free from any systemic diseases that might affect the bone quality or post-operative healing. * Completely edentulous patients with their age range from 55 to 65 years * All patients have Angle's Class I maxillomandibular relationship * Normal facial symmetry with no signs and symptoms of temporomandibular disorders. * Cooperative patients * Adequate inter-arch space. * All patients have recent and old extractions ,a period of at least 6 months from the date of last extraction. * All patients have lower arch with irregular buccolingual thickness . * Edentulous ridge covered by healthy firm mucoperiosteum, without abnormal morphology. * Normal tongue size. * All the selected patients should be free from any oral pathological lesions such as cysts, remaining root, or residual infection. Exclusion Criteria: General health conditions preclude a minor surgical intervention, risk patients are excluded. * Local anesthesia with a vasoconstrictor is contraindicated * Immunosuppressive therapy, prolonged intake of antibiotics or corticosteroids, or brittle metabolic disease history.