Non-grafted maxillary sinus floor elevation which is based on the concept of membrane elevation and support either by tenting technique or space maintaining mesh solved the problem of maxillary sinus pneumatization by creating a space for new bone formation with subsequent implant placement in the edentulous posterior maxilla. The aim of this study is to evaluate the predictability of new bone formation after sinus floor elevation using a bioresorpable mesh. Eight patients with sinus pneumatization were selected for implant placement in the edentulous posterior maxilla. Pneumatized sinuses were approached through lateral window technique and the membrane was elevated and sustained with a bioresorbable mesh. All patients were clinically and radiographically evaluated immediately and at 6 months postoperatively. At six months post-operatively, core bone biopsy was performed for histological examination of the formed bone using a trephine drill at the planned implant position. All patients showed uneventful healing and radiographic, clinical and histological evidence of new bone formation and it was concluded that the bioresorpable mesh was reliable and predictable as a space maintaining device.