目的 探索明胶海绵复合生长因子缓释系统加速颌骨骨折愈合的作用和机制,为临床加速颌骨骨折愈合提供新的方法。方法 按每100 μg基因重组人骨形态发生蛋白（BMP）-2用1 mL重组牛碱性成纤维细胞生长因子（bFGF）液完全溶解后,取40 μL滴加到明胶海绵（0.5 cm×0.5 cm×1.0 cm）组织块中,冻干后制成bFGF/BMP/明胶海绵缓释系统。在12只新西兰大白兔两侧下颌制造线样骨折,左侧为对照组,只用钛板固定;右侧为实验组,钛板下放置bFGF/BMP/明胶海绵。术后2、4、12周行大体观察、X线检查、组织学检查。结果 术后2周,实验组较对照组在骨折断端处可见更多纤维组织长入;术后4周,实验组骨折间隙可见到纤维性骨痂,对照组可见纤维组织和血管长入;12周后实验组和对照组骨折均已完全愈合。结论 bFGF/BMP/明胶海绵能加速骨折愈合,提高骨折愈合效果。
Objective To explore the role and mechanism of drug delivery systems using growth factor combined with gelatin sponge on accelerating the healing of jaw fracture and to seek better treatment of accelerating the maxillofacial fracture. Methods About 100 μg recombinant human bone morphogenetic protein （BMP）-2 was completely dissolved in 1 mL recombi-nant bovine basic fibroblast growth factor （bFGF）, and the solution （40 μL） was dropped in gelatin sponge （0.5 cm×0.5 cm×1.0 cm）. Then, it was freeze dried and prepared into bFGF/BMP/gelatin sponge delivery systems. The mandibular fracture model on two sides were prepared in 12 New Zealand rabbits and randomly divided into two groups. The left side was the control group, which was only fixed with titanium plates. The right side was the experimental group, in which bFGF/BMP/gelatin sponge delivery systems were put under the titanium plates. General observation, X-ray, and histological examination were taken at 2, 4, and 12 weeks after surgery. Results After 2 weeks, more fibrous tissues were seen between the fracture ends in the experimental group than in the control group. After 4 weeks, fibrous fracture callus were seen in the fracture gap in the experimental group. The ingrowths of fibrous tissue and blood vessels were seen in the control group. The fracture healing of the experimental group was significantly faster than the control group at 2 and 4 weeks. After 12 weeks, the experimental and control groups all healed completely. Conclusion bFGF/BMP/gelatin sponge can accelerate and improve fracture healing; thus, it has better clinical application prospect.
West China Journal of Stomatology