Molded bone augmentation by a combination of barrier membrane and recombinant human bone morphogenetic protein-2.
OBJECTIVE
To provide the histological background to a new method of local bone augmentation, we examined the events occurring beneath a barrier membrane applied with recombinant human bone morphogenetic protein-2 (rhBMP-2).


METHODS
The effects on bone augmentation of rhBMP-2, applied with a membrane mold (BMP-Memb), over surgically-induced bone defects in rat calvaria were examined histologically, and the results compared with those from application of rhBMP-2 (BMP) alone, or of a molded membrane (Memb) alone.


RESULTS
At postoperative week 2, the BMP group showed the most marked bone formation. However, the bone diminished in size by week 8. The Memb group showed slow but continuous bone formation by week 8. In the BMP-Memb group, bone filled the space in the mold at week 2, and this was maintained until week 8. Moreover, the soft tissue that had intervened between newly formed bone and the membrane in the Memb group was not evident in the BMP-Memb group, in which bone had formed directly on the membrane.


CONCLUSIONS
The results suggest that the combination of rhBMP-2 and barrier membrane has advantages in producing and maintaining bone in the intended shape by inducing osteoblasts directly on the inner surface of the membrane.
Department of Oral Health Science, Division of Oral Health in Aging and Fixed Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Japan.
H
H
Takeishi
K
K
Irie
K
K
Okuda
H
H
Ozawa
T
T
Yajima
S
S
Ejiri
D000818:Animals; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D048091:Guided Tissue Regeneration / Q000379:methods*; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008567:Membranes, Artificial; D010006:Osteoblasts / Q000187:drug effects / Q000201:enzymology; D010012:Osteogenesis / Q000187:drug effects*; D011138:Polytetrafluoroethylene; D051381:Rats; D017208:Rats, Wistar; D011994:Recombinant Proteins / Q000494:pharmacology; D012886:Skull; D023822:Tissue Engineering / Q000379:methods; D016212:Transforming Growth Factor beta
C525718:BMP2 protein, human; C525720:Bmp2 protein, rat; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D008567:Membranes, Artificial; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; C499469:recombinant human bone morphogenetic protein-2; D011138:Polytetrafluoroethylene