AUGMENTATION OF THE FLOOR OF THE MAXILLARY SINUS WITH RECOMBINANT HUMAN BONE MORPHOGENETIC PROTEIN-7: A PILOT RADIOLOGICAL AND HISTOLOGICAL STUDY IN HUMANS.

The aim of this study was to evaluate the quantity and quality of bony regeneration after we had used recombinant human bone morphogenetic protein-7 (rhBMP-7 to augment the floor of the maxillary sinus. Nine consecutive patients with bilateral posterior maxillary atrophy who required augmentation of the sinus for interposition of implants were treated simultaneously with rhBMP-7 (Osigraft) with deproteinised bone substitute (0.5g on the test side) and with deproteinised bone alone (2.0g on the control side). Computed tomographic images preoperatively, immediately postoperatively, and at 4 months postoperatively showed a mean (SD) postoperative gain of 10.8 (3.0)mm on the test side and of 10.2 (1.8)mm on the control side. Histological and histomorphometric analyses of biopsy specimens showed that there was significantly more new bone on the control side (19.9 (6.8)%) than on the test side (6.6 (4.8)%). In this pilot controlled trial of the use of rhBMP-7, histological analyses showed that it resulted in the formation of less bone than treatment with inorganic bovine hydroxyapatite.