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

背景:近年来,组织工程技术作为新型组织再生模式,为牙周缺损修复提供了新的思路和方法。目的:观察人牙周韧带细胞-聚羟基乙酸支架复合体修复牙周组织缺损的效果。方法:采用多次沉淀法将第4代人牙周韧带细胞以1.5×109 L-1的浓度接种于聚羟基乙酸支架上,制备细胞-支架复合体。取10只杂种犬,建立牙周组织缺损模型后随机分组,实验组牙周组织缺损处植入细胞-支架复合体,对照组牙周组织缺损处直接直接龈瓣冠向复位缝合。术后4周内,检测两组牙周组织缺损处胶原组织、新生毛细血管、新生牙骨质、新生牙槽骨与新生牙周膜组织;术后8周,进行牙周组织缺损处苏木精-伊红染色。结果与结论:实验组术后1,2,3,4周的胶原含量、新生毛细血管数量、新生牙骨质、新生牙槽骨、新生牙周膜组织均显著多于对照组(P<0.05)。术后8周,实验组新生牙槽骨的结缔组织面存在较多血管排列,牙槽骨与牙周膜的链接呈锯齿状,可看见薄层牙骨质沉积;对照组仅见新生牙槽骨和牙骨质形成,部分位于切迹以下。结果表明,人牙周韧带细胞-聚羟基乙酸支架复合体可促进牙周组织再生。

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.