Basal Versus Compressive Implant Designs Immediately Loaded With Bar Retained Complete Overdenture for Atrophied Edentulous Mandibular Ridge: Clinical and Radiographic Study of peri_implant Tissue Health

Patients will be divided randomly in to 2 equal groups:

• Group1: this group will receive immediate loaded screw retained complete overdenture supported by 4 basal implants design .
• Group2 :this group will receive immediate loaded screw retained complete overdenture supported by 4 compressive implants design
• After final implant placements, they will be immediately scanned by intraoral scanner to construct milled in titanium bar which will be immediately screwed into the implants
• Mandibular screw retained complete overdenture will be constructed.

Evaluation will be for:

• Peri implant tissue health that will be measured according to mombelli(12) at the time of insertion(T0), 6months(T1) and 12months (T2).
• Marginal bone height changes will be measured using standardized digital panoramic x-ray(13) after 6months (T0), 12month(T1) and 24months(T2) after prosthesis insertion.
• Periotest will evaluate the stability of the implants during implantation (T0) , 3months(T1) and 6months(T3) following surgery(14) .