الفهرس 
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Abstract
Six completely edentulous patients were selected for this study. Patients were randomly classified into two equal groups. group A:patients that would be delivered mandibular complete overdenture retained by two canine mini-implants with ball attachments without posterior support by short implants.group B: patients that would be delivered mandibular complete overdenture retained by two canine mini-implants with ball attachments with posterior support by bilateral short implants with healing abutments (in first molar regions). The alveolar bone height changes around mini-implants were radiographically evaluated at the following time intervals: immediately (T0), 6 months (T6), 12 months (T12) and 18 months (T18) after mandibular complete overdenture insertion using standardized periapical radiographs.