الفهرس 
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Abstract
The present study was conducted on ten patients suffered from unilateral edentulous maxillary posterior area. The patients were selected from the Out Patient Clinic of Maxillofacial Department, Faculty of Dentistry, Minia University.
The patients have been divided into two equal groups. Both groups were treated using the same implant length and diameter. Group I patients received dental implants that intrUded 2 mm through the sinus cavity. While, group II patients received implants that extended 4 mm intrasinus.
For both groups, clinical examination were carried on to exclude sinus pathology and factors hindering implant placement. Preoperative radiographs in terms of orthopantograms and dental CT were taken for each case. Also digital orthopantograms and dental CT were obtained in the postoperative follow up period to evaluate both implants and sinus conditions.
All patients were followed up clinically at the Out patient Clinic of Oral Surgery Department, Faculty of Dentistry, Minia University, to evaluate soft tissue healing, implant stability , signs and symptoms of sinus infection. Clinical results showed uneventful healing for most surgical wounds . All implants of both groups remained stable. Sinus was free from any pathosis in all patients.
Radiographic evaluation revealed that all implants had good osseointegration before and after loading. Sinus reaction was found in both groups but with higher percentage in group II. However there were