混旋聚乳酸-纳米羟基磷灰石复合板固定下颌骨骨折的实验研究

目的 探讨混旋聚乳酸—纳米羟基磷灰石(poly DL lactide—nano—hydroxyapatite，PDLLA—nano HA)复合板(简称复合板)作颌骨骨折内固定的可行性。方法 在兔两侧下颁骨体部造成实验骨折，分别采用复合板和纯PDLLA板固定。在不同时期行大体观察、组织学检查，测量骨痂横截面积。结果 各时期骨折固定良好；术后第2、3周，各有1只动物的PDLLA板侧出现炎性包块，形成瘘道；复合板侧均正常愈合。术后2、3、4周时复合板侧骨痂形成量与对侧差异有显著性。组织学检查发现，骨折愈合早期复合板侧成骨细胞和成纤维细胞及其分泌的细胞基质更为丰富。结论 复合板在体内降解速度适中，对骨折愈合过程无不良影响，比纯PDLIA板更适用于颌骨骨折。

Mandibular fracture fixed with PDLLA/nano-HA compound plates: an animal study

Objective To investigate the applicability of PDLLA/nano-HA compound plates used in internal fixation of mandibular fractures. Methods Rabbit mandibular fracture model was used in this study. Clinical observation, the amount of callus, histological observation were studied and compared with PDLLA plates. Results All fractures were fixed rigidly. There was 1 animal experienced local inflammation and then forming fistula in the side of PDLLA plate at postoperative 2 and 3 weeks. No side-effects were found in the side of compound plates. During the early stage of bone healing, the quality of callus in the side of compound plates was apparently more than that in the other side, and histological study showed that the osteoblasts and fibroblasts were more active in the side of compound plate in the early healing stage. Conclusions PDLLA/nano-HA compound plate has a proper degradation time. Compared with PDLLA plates, it is more effective and safer when used in mandibular fracture.