Twenty one patients with deficient posterior maxilla and alveolar bone height ≤ 5mm were included.Those patients randomly divided into 3 equal groups: 1. Group 1: 7 patients treated by osteotome closed sinus lift with bone grafting (xenograft) and implant placement. 2. Group 2: 7 patients treated by densah burs(Versah, Jackson, MI, USA) sinus lift with bone grafting (xenograft) and implant placement. 3. Group 3: 7 patients treated by piezoelectric (Piezotome; Satelec) crestal sinus lift with bone grafting (xenograft) and implant placement.
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dental implant stability
Timeframe: 6 months
maxillary sinus augmentation
Timeframe: 6 months