中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (30): 4793-4798.doi: 10.3969/j.issn.2095-4344.1435

• 复合支架材料 composite scaffold materials • 上一篇    下一篇

真空冷冻干燥法制备聚乳酸/生物玻璃支架及性能研究

马丽娟,邓久鹏,尹浩月,田宜文
  

  1. 华北理工大学口腔学院,河北省唐山市  063000
  • 收稿日期:2019-03-22 出版日期:2019-10-28 发布日期:2019-10-28
  • 通讯作者: 邓久鹏,副教授,华北理工大学口腔学院,河北省唐山市 063000
  • 作者简介:马丽娟,女,1992年生,河北省唐山市人,汉族,硕士,主要从事口腔修复学研究。
  • 基金资助:

    河北省教育厅重点项目(ZD2015016),项目名称:掺锶透钙磷石涂层对骨质疏松种植体骨结合的作用及机制研究,项目参与者:邓久鹏

Preparation of polylactic acid/bioactive glass composite material by vacuum freeze-drying technique and study on its performance

Ma Lijuan, Deng Jiupeng, Yin Haoyue, Tian Yiwen
  

  1. School of Stomatology, North China University of Science and Technology, Tangshan 063000, Hebei Province, China
  • Received:2019-03-22 Online:2019-10-28 Published:2019-10-28
  • Contact: Deng Jiupeng, Associate professor, School of Stomatology, North China University of Science and Technology, Tangshan 063000, Hebei Province, China
  • About author:Ma Lijuan, Master, School of Stomatology, North China University of Science and Technology, Tangshan 063000, Hebei Province, China
  • Supported by:

    the Major Project of Education Department of Hebei Province, No. ZD2015016 (to DJP)

摘要:

文章快速阅读:

 

文题释义:
真空冷冻干燥技术:是将湿物料或溶液在较低的温度(-10-50 ℃)下冻结成固态,然后在真空(1.3-13 Pa)下使其中的水分不经液态直接升华成气态,最终使物料脱水的干燥技术。
聚乳酸/生物玻璃支架:实验中应用的二氯甲烷和1,4-二氧六环,利用二者与聚合物之间的化学反应及有机溶剂的易挥发性,在真空冷冻干燥机的使用下,保持了生物活性玻璃和聚乳酸物理化学性质不受改变的条件下,制备的支架结构避免了NaCl、NaHCO3及其混合物等致孔剂残留的问题。
 
 
背景:有文献指出,向聚乳酸中加入生物活性玻璃颗粒可提高材料的力学性能。
目的:采用真空冷冻干燥法制备聚乳酸/生物活性玻璃骨组织工程支架材料,并分析其性能。
方法:以1,4-二氧六环与二氯甲烷为致孔剂,采用真空冷冻干燥技术制备含生物活性玻璃质量分数分别为10%,20%,30%的聚乳酸/生物活性玻璃复合材料,检测复合材料的孔隙率、抗压强度。将含10%,20%,30%生物活性玻璃复合材料浸泡于模拟体液中2周,观察支架浸泡前后的微观结构与元素变化。分别以聚乳酸浸提液、含10%,20%,30%生物活性玻璃复合材料浸提液与苯酚溶液(阳性对照)培养L929成纤维细胞,以常规培养的细胞为对阴性对照,培养1,3,5 d,采用MTT法检测细胞增殖。
结果与结论:①含10%,20%生物活性玻璃复合材料的孔隙率高于聚乳酸材料(P < 0.05);②各聚乳酸/生物活性玻璃复合材料的抗压强度均高于聚乳酸材料(P < 0.05),并且含20%生物活性玻璃复合支架组的抗压强度高于含10%,30%生物活性玻璃复合支架组(P < 0.05);③扫描电镜显示,复合材料孔隙内壁上均有大量微孔结构,生物活性玻璃分散在材料中,孔隙大小不均,孔隙之间相互沟通,随着生物活性玻璃含量的增加,孔隙有堵塞现象;在模拟体液中浸泡2周后,复合材料有明显的羟基磷灰石生成,并且钙、磷、硅元素比例升高;④培养1,3,5 d,含10%,20%,30%生物活性玻璃复合支架组表面的细胞增殖快于阳性对照组 (P < 0.05),与阴性对照组、聚乳酸组比较差异无显著性意义(P > 0.05);⑤结果表明,采用真空冷冻干燥法制备可制备具有良好孔隙率、抗压强度与细胞相容性的聚乳酸/生物活性玻璃复合支架。

关键词: 聚乳酸/生物活性玻璃复合材料, 生物玻璃, 聚乳酸, 冷冻干燥法, 骨组织工程支架材料, 孔隙率, 抗压强度, 细胞增殖

Abstract:

BACKGROUND: Bioactive glass added into polylactic acid can improve the mechanical property of the material.
OBJECTIVE: To prepare the tissue-engineered scaffold of polylactic acid/bioactive glass composites by vacuum freeze-drying technique and study its performance.
METHODS: For 1,4-dioxane and dichloromethane as pore-forming agents, polylactic acid containing 10%, 20% and 30% bioactive glass were prepared by vacuum freeze-drying technique. The porosity and compressive strength were detected. In order to observe the microstructure and element changes of composites before and after soaked into the simulated body fluid for 2 weeks. L929 fibroblasts were cultured with polylactic acid leach liquor, polylactic acid/bioactive glass composites leaching liquor and phenol solution, and the cells of being cultured in routine culture were used as control, respectively. After culture for 1, 3 and 5 days, MTT was used to detect cell proliferation.
RESULTS AND CONCLUSION: (1) The porosity of polylactic acid containing 10% and 20% bioactive glass was higher than that of polylactic acid (P < 0.05). (2) The compressive strength of polylactic acid/bioactive glass composite was higher than that of polylactic acid (P < 0.05), and the compressive strength of 20% bioactive glass composite was higher than that of 10% and 30% bioactive glass composites (P < 0.05). (3) Scanning electron microscopy showed that the inner pore wall of polylactic acid materials has a large amount of micropore structures, bioactive glass distributed in the composite, the pore size was uneven and the pores communicated with each other. As the increasing of bioactive glass contents, there were lots of blocked pores. After immersion in simulated body fluid for 2 weeks, polylactic acid/bioactive glass containing composites showed obvious hydroxyapatite formation, but there was no hydroxyapatite formation in polylactic acid. The immersion of polylactic acid was only the change of PH value, but the ratio of calcium and phosphorus was higher than that before soaking in composite materials. After soaking, there was a large amount of hydroxyapatite formation, and the proportion of calcium and phosphorus was reduced accordingly. At the same time, the Si in bioactive glass was released. (4) The cell proliferation in the polylactic acid/bioactive glass composite containing 10% and 20% bioactive glass was significantly faster than that of positive control group after 1, 3 and 5 days of culture (P < 0.05), which showed no significant difference compared with the negative control and polylactic acid groups (P > 0.05) (5) These results suggest that polylactic acid/bioactive glass containing composite scaffolds with good porosity, compressive strength and cellular compatibility can be prepared by vacuum freeze-drying technique.

Key words: polylactic acid/bioactive glass containing composite material, bioactive glass, polylactic acid, vacuum freeze-drying technique, bone tissue-engineered scaffold material, porosity, compressive strength, cell proliferation

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