Aim: This study was carried out to evaluate clinically and radiographically using of nanocrystalline hydroxyapatite (NcHA) and platelet-rich fibrin (PRF) as a grafting materials around the implant after narrow alveolar ridge splitting and expansion by piezoelectric surgery. Subjects and methods: twenty systemically healthy patients with partial edentulous narrow maxillary alveolar ridges were selected from those attending at the Out-
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