Expression of bone morphogenetic protein 2 and fibroblast growth factor 2 during bone regeneration using different implant materials as an onlay bone graft in rabbit mandibles

Objectives The purpose of this study was to histologically and immunohistochemically evaluate bone regeneration using 3 different implant materials in rabbit mandibles and to compare the bone regenerative capability of these materials in an animal model. Study design Adult male Japanese white rabbit...

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Published in:Oral surgery, oral medicine, oral pathology, oral radiology and endodontics oral medicine, oral pathology, oral radiology and endodontics, 2007, Vol.103 (1), p.16-26
Main Authors: Alam, Shamiul, BDS, Ueki, Koichiro, DDS, PhD, Marukawa, Kohei, DDS, PhD, Ohara, Teruhisa, DDS, Hase, Takashi, DDS, Takazakura, Daisuke, DDS, PhD, Nakagawa, Kiyomasa, DDS, PhD
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Bone Morphogenetic Protein 2
Bone Morphogenetic Proteins - metabolism
Bone Morphogenetic Proteins - therapeutic use
Bone Regeneration - drug effects
Bone Substitutes - therapeutic use
Bone Transplantation - methods
Calcium Phosphates - therapeutic use
Dentistry
Fibroblast Growth Factor 2 - metabolism
Lactic Acid - therapeutic use
Male
Mandible - metabolism
Mandible - surgery
Medical sciences
Models, Animal
Otorhinolaryngology. Stomatology
Polyesters
Polymers - therapeutic use
Rabbits
Radius - transplantation
Recombinant Proteins - therapeutic use
Surgery
Transforming Growth Factor beta - metabolism
Transforming Growth Factor beta - therapeutic use
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Summary:Objectives The purpose of this study was to histologically and immunohistochemically evaluate bone regeneration using 3 different implant materials in rabbit mandibles and to compare the bone regenerative capability of these materials in an animal model. Study design Adult male Japanese white rabbits (n = 48; 12-16 wks old; 2.5-3.0 kg) were divided into 4 groups, consisting of 12 animals each. The implant materials were β-tricalcium phosphate (β-TCP), autologous bone derived from the radius, and recombinant human bone morphogenetic protein 2 (rhBMP-2) with polylactic acid/polyglycolic acid copolymer and gelatin sponge (PGS) complex. After incising along the inferior border of the mandible, the materials were implanted as only grafts and covered by titanium mesh with screws. No material was implanted into the control group. The rabbits were killed at 2, 4, 8, 12, and 24 wks postoperatively, and formalin-fixed specimens containing titanium mesh were embedded in acrylic resin. The specimens were stained with hematoxylin and eosin. For immunohistochemical analysis, the specimens were treated with BMP-2 and fibroblast growth factor 2 (FGF-2) antibodies. Finally, they were examined microscopically. Results The autologous bone induced substantially more new bone formation compared with β-TCP at 4 wks postoperatively. However, rhBMP-2/PGS induced new bone formation at 8 wks postoperatively. No growth of bony tissue was observed in the control group at any period. In the autologous bone and rhBMP-2/PGS groups, both BMP-2 and FGF-2 were observed later in the β-TCP group than in other groups. Conclusion This study suggests that autologous bone as well as rhBMP-2/PGS implants induce expression of both BMP-2 and FGF-2 specifically at the operated sites, even at early stages.
ISSN:1079-2104
1528-395X
DOI:10.1016/j.tripleo.2006.01.019