中国组织工程研究

• 组织工程口腔材料 tissue-engineered oral materials • 上一篇    下一篇

填料协同增强增韧光固化树脂基口腔材料的制备、性能及生物力学评价

罗  毅1,蒋俊强2,但洪平1   

  1. 1宜宾市第一人民医院口腔科,四川省宜宾市   644000;2西南医科大学,四川省泸州市   646000
  • 收稿日期:2016-12-22 出版日期:2017-04-08 发布日期:2017-05-08
  • 作者简介:罗毅,女,1976年生,四川省宜宾市人,2000年泸州医学院毕业,副主任医师,主要从事口腔内科、种植等研究。
  • 基金资助:

    四川省卫生科技创新项目(2014K0122)

A filler synergistic toughening light-curig resin-based dental material: preparation, performance and biomechanical evaluation

Luo Yi1, Jiang Jun-qiang2, Dan Hong-ping1   

  1. 1 Department of Stomatology, the First People’s Hospital of Yibin, Yibin 644000, Sichuan Province, China; 2 Southwest Medical University, Luzhou 646000, Sichuan Province, China
  • Received:2016-12-22 Online:2017-04-08 Published:2017-05-08
  • About author:Luo Yi, Associate chief physician, Department of Stomatology, the First People’s Hospital of Yibin, Yibin 644000, Sichuan Province, China
  • Supported by:

    the Health and Technology Innovation Project of Sichuan Province, No. 2014K0122

摘要:

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文题释义:
静电纺丝技术
:静电纺丝就是高分子流体静电雾化的特殊形式,此时雾化分裂出的物质不是微小液滴,而是聚合物微小射流,可以运行相当长的距离,最终固化成纤维。
光固化树脂:又称光敏树脂,是一种受光线照射后,能在较短的时间内迅速发生物理和化学变化,进而交联固化的低聚物。光固化树脂是一种相对分子质量较低的感光性树脂,具有可进行光固化的反应性基团,如不饱和双键或环氧基等。光固化树脂是光固化涂料的基体树脂,它与光引发剂、活性稀释剂以及各种助剂复配,即构成光固化涂料。


背景:光固化复合树脂由于色泽美观、优良的物理、化学性能及操作简单等在牙科缺损修复中得到应用。但是,复合树脂由于力学性能不足容易引起复合体折断,导致临床使用难以达到预期治疗效果。
目的:探讨填料协同增强增韧光固化树脂基口腔材料的制备方法、性能及生物力学特征。
方法:以原子转移自由基聚合方法对纳米二氧化硅进行表面接枝聚甲基丙烯酸甲酯(SiO2-PMMA)改性,获得接枝SiO2-PMMA,利用同轴静电纺丝方法制备聚丙烯腈/聚甲基丙烯酸甲酯核-壳纳米纤维,以铜网作为接收装置获得具备网格结构的二维乳酸-羟基乙酸共聚物纳米纤维膜。以硅烷偶联剂为原乙酯前驱体溶胶-沉淀法制备多尺度、多维度填料,采用硅烷偶联剂进行改性。将接枝SiO2-PMMA核-壳纳米纤维、梯形聚硅氧烷材料与光固化树脂基体进行复合,比较两种复合树脂材料的力学性能、体积收缩率、毒性、降解性能等。
结果与结论:①复合树脂断裂形貌的电镜表征:填料接枝SiO2-PMMA核-壳纳米纤维在光固化树脂基体中能较好的分散,团聚现象相对较少,存在单分散现象;而梯形聚硅氧烷材料在光固化树脂基体中分散不均匀,且在复合树脂中甚至出现团聚现象;②弯曲强度、弯曲模量及断裂功:填料接枝SiO2-PMMA核-壳纳米纤维光固化树脂基口腔材料的弯曲强度、弯曲模量及断裂功显著高于梯形聚硅氧烷材料光固化树脂基口腔材料(P < 0.05);③体积收缩率:填料接枝SiO2-PMMA核-壳纳米纤维光固化树脂基口腔材料的体积收缩率低于梯形聚硅氧烷材料光固化树脂基口腔材料(P < 0.05);④性能测定:填料接枝SiO2-PMMA核-壳纳米纤维光固化树脂基口腔材料吸水性及细胞毒性A值高于梯形聚硅氧烷材料光固化树脂基口腔材料(P < 0.05),而溶解值低于梯形聚硅氧烷材料光固化树脂基口腔材料(P < 0.05);⑤提示制备的填料协同增强增韧光固化树脂基口腔材料具备优良的性能和生物力学特征。

ORCID: 0000-0002-0078-3872(罗毅)

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

关键词: 生物材料, 口腔生物材料, 光固化树脂, 生物力学, 二氧化硅, 聚甲基丙烯酸甲酯, 梯形聚硅氧烷材料

Abstract:

BACKGROUND: Light-curing composite resins have been applied in the dental repair due to its beautiful color, excellent physical and chemical properties and easy to operation. However, its insufficient mechanical properties tend to cause composite fractures, resulting in undesired clinical efficacy.
OBJECTIVE: To investigate the preparation, properties and biomechanical performances of filler-co-augmented photo-curable resin-based oral materials.
METHODS: The nano-silica surface-grafted with poly(methyl methacrylate) (PMMA) was obtained by atom transfer radical polymerization. Co-electrospinning was used to prepare the acrylonitrile/PMMA core-shell nanofibers, and a two-dimensional lactic acid-glycolic acid copolymer nanofiber membrane with a lattice structure was obtained using a copper mesh as a receiving device. The multi-scale and multi-dimensional packing was prepared by sol-precipitation method with silane coupling agent as a raw ethyl ester precursor, and further modified using silane coupling agent. The mechanical properties, volumetric shrinkage, toxicity, and degradation properties of the light-curing resin grafted with SiO2-PMMA were compared with those of the light-curing resin combined with trapezoidal polysiloxane materials grafted with methyl methacrylate.
RESULTS AND CONCLUSION: (1) Characterization of the composite resin under scanning electron microscope: the filler SiO2-PMMA core-shell nanofibers dispersed well in the light-curing resin matrix, in the presence of monodisperse phenomenon and less aggregation phenomenon. However, the trapezoidal polysiloxane material in the light-curing resin matrix dispersed unevenly, in the presence of reunion phenomenon. (2) The flexural strength, flexural modulus and fracture work of the light-curing resin grafted with SiO2-PMMA core-shell nanofibers were significantly higher than those of the trapezoidal polysiloxane-based light-curing resin (P < 0.05). (3) The volume shrinkage of the light-curing resin grafted with SiO2-PMMA core-shell nanofibers was lower than that of the trapezoidal polysiloxane-based light-curing resin (P < 0.05). (4) Compared with the trapezoidal polysiloxane-based light-curing resin, the water absorption and cytotoxicity (absorbance value) of the light-curing resin grafted with SiO2-PMMA core-shell nanofibers were significantly higher than those of the trapezoidal polysiloxane-based light-curing resin (P < 0.05), while the solubility of the light-curing resin grafted with SiO2-PMMA core-shell nanofibers was lower (P < 0.05). It is concluded that the prepared light-curing resin grafted with SiO2-PMMA core-shell nanofibers has excellent properties and biomechanical properties.

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

Key words: Biocompatible Materials, Mouth, Silicon Dioxide, Composite Resins, Biomechanics, Tissue Engineering

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