人牙周韧带细胞-聚羟基乙酸支架复合体修复牙周组织缺损

Human periodontal ligament cells-polyglycolic acid scaffold complex for repair of periodontal tissue defects

BACKGROUND: In recent years, tissue engineering technology as a new model for tissue regeneration has provided new ideas and methods for the repair of periodontal tissue defects. OBJECTIVE: To investigate the effect of human periodontal ligament cells-polyglycolic acid scaffold complex for repair of periodontal tissue defects. METHODS: Passage 4 human periodontal ligament cells at a density of 1.5×109/L were seeded onto the polyglycolic acid scaffold to prepare cell-scaffold complex. Then mongrel dogs were selected to make animal models of periodontal tissue defects and then randomly assigned into experimental group subjected to cell-scaffold complex implantation or control group subjected to direct coronal reset and suture of the gingival flap. Collagen content, new blood capillaries, new cementum, new alveolar bone and new periodontal ligament were detected within 4 weeks after operation; hematoxylin-eosin staining of periodontal tissue defects was done at 8 weeks after operation. RESULTS AND CONCLUSION: In the experimental group, the collagen content, number of newborn capillaries, amount of new cementum, new alveolar bone and new periodontal ligament tissues were significantly higher than those in the control group at postoperative 1, 2, 3, 4 weeks (P < 0.05). At 8 weeks after operation, in the experimental group, there were more vessels arranging on the connective tissue surface of new alveolar bone, the alveolar bone showed a sawtooth-like interlinking with the periodontal tissues in the presence of a thin layer of cementum; in the control group, only new alveolar bone and cementum formed below the incisure. These findings indicate that human periodontal ligament cells-polyglycolic acid scaffold complex can promote periodontal tissue regeneration.