纳米羟基磷灰石-聚酰胺人工骨修复犬下颌骨体缺损的实验研究

目的　研究新型纳米羟基磷灰石 聚酰胺 (n HA PA6 6 )复合人工骨修复犬下颌骨缺损的效果。方法　在犬下颌骨体上设计两个 15mm× 10mm× 5mm的箱状缺损 ,在其中一个植入相应大小的n HA PA6 6预制块 ,另一缺损作空白对照。于术后 2、4、8、12、16周切取组织标本 ,进行X线摄片和组织学切片检查 ,观察骨缺损修复情况。结果　术区未见明显的排斥反应。第 2～ 8周人工骨周围被纤维结缔组织包裹 ,12周时人工骨—组织界面上出现膜性成骨迹象 ,第 16周n HA PA6 6人工骨被新生骨组织完全包裹 ,受植床与人工骨形成骨性结合。结论　n HA PA6 6人工骨有良好的生物相容性 ,具有骨引导和潜在的骨诱导作用

Experimental study on the reconstruction of mandibular defects with a new bone nano-hydroxyapatite/polyamide-66 in dogs

OBJECTIVE: This study was designed to investigate reconstruction of segmental defect in the mandible using a new bionic materials of nano-hydroxyapatite -polyainides-66 (n-HA/PA66). METHODS: Two defects (15 mm x 10 mm x 5 mm) were created in the mandibular bodies of dogs. One of defects was reconstructed with n-HA/PA66, another not repaired as a blank control. At 2, 4, 8, 12, 16 weeks after operation. Evaluation of effects of n-HA/PA66 on reconstruction of the mandibular defects was carried out by means of radiography and histology. RESULTS: From 2 to 8 weeks after operation, some fiber tissue grew into the space between n-HA/PA66 and mandibular bone. The ossification was observed at 12 weeks post-operation. At 16 weeks, the n-HA/PA66 was connected directly to the mandibular bone by the newborn bone. CONCLUSIONS: The new artificial bone of n-HA/PA66 has the effects of osteoconduction and osteoinduction, with a good biocompatibility and is an ideal bone substitute material for reconstruction of mandibular defect.