...
首页> 外文期刊>Dental materials >Structural and dynamical studies of acid-mediated conversion in amorphous-calcium-phosphate based dental composites
【24h】

Structural and dynamical studies of acid-mediated conversion in amorphous-calcium-phosphate based dental composites

机译:非晶态磷酸钙基牙科复合材料中酸介导的转化的结构和动力学研究

获取原文
获取原文并翻译 | 示例
           

摘要

Objective. To investigate the complex structural and dynamical conversion process of the amorphous-calcium-phosphate (ACP)-to-apatite transition in ACP based dental composite materials. Methods. Composite disks were prepared using zirconia hybridized ACP fillers (0.4 mass fraction) and photo-activated Bis-GMA/TEGDMA resin (0.6 mass fraction). We performed an investigation of the solution-mediated ACP-to-apatite conversion mechanism in controlled acidic aqueous environment with in situ ultra-small angle X-ray scattering based coherent X-ray photon correlation spectroscopy and ex situ X-ray diffraction, as well as other complementary techniques. Results. We established that the ACP-to-apatite conversion in ACP composites is a two-step process, owing to the sensitivity to local structural changes provided by coherent X-rays. Initially, ACP undergoes a local microstructural rearrangement without losing its amorphous character. We established the catalytic role of the acid and found the time scale of this rearrangement strongly depends on the pH of the solution, which agrees with previous findings about ACP without the polymer matrix being present. In the second step, ACP is converted to an apatitic form with the crystallinity of the formed crystallites being poor. Separately, we also confirmed that in the regular Zr-modified ACP the rate of ACP conversion to hydroxyapatite is slowed significantly compared to unmodified ACP, which is beneficial for targeted slow release of functional calcium and phosphate ions from dental composite materials.
机译:目的。目的研究基于ACP的牙科复合材料中无定形磷酸钙(ACP)向磷灰石过渡的复杂结构和动力学转化过程。方法。使用氧化锆杂化的ACP填料(质量分数为0.4)和光活化Bis-GMA / TEGDMA树脂(质量分数为0.6)制备复合盘。我们使用基于原位超小角X射线散射的相干X射线光子相关光谱和非原位X射线衍射技术,研究了在受控酸性水环境中溶液介导的ACP到磷灰石转化机理。作为其他补充技术。结果。我们确定,由于对相干X射线提供的局部结构变化的敏感性,ACP复合材料中的ACP到磷灰石的转换是一个两步过程。最初,ACP经历了局部微结构重排,而不会失去其非晶态特性。我们确定了酸的催化作用,发现这种重排的时间尺度在很大程度上取决于溶液的pH值,这与先前关于ACP的发现一致,而没有聚合物基质。在第二步骤中,ACP被转化为非亲溶形式,所形成的微晶的结晶度差。另外,我们还证实,在常规Zr改性的ACP中,与未改性的ACP相比,ACP向羟基磷灰石的转化速率显着降低,这有利于从牙科复合材料中缓慢释放功能性钙和磷酸根离子。

著录项

  • 来源
    《Dental materials》 |2014年第10期|1113-1125|共13页
  • 作者单位

    Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive,Gaithersburg, MD 20899, USA,Materials Measurement Science Division, 100 Bureau, M.S. 8520, Gaithersburg, MD 20899, USA;

    Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive,Gaithersburg, MD 20899, USA;

    Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive,Gaithersburg, MD 20899, USA;

    Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive,Gaithersburg, MD 20899, USA;

    Volpe Research Center, American Dental Association Foundation, Gaithersburg, MD 20899, USA;

    Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive,Gaithersburg, MD 20899, USA;

    Volpe Research Center, American Dental Association Foundation, Gaithersburg, MD 20899, USA;

    Volpe Research Center, American Dental Association Foundation, Gaithersburg, MD 20899, USA;

    X-ray Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Amorphous calcium phosphate; ACP-based composites; Dental composites; Dental material; Acid-medicated conversion; Structure; Amorphous conversion;

    机译:无定形磷酸钙;基于ACP的复合材料;牙科复合材料;牙科材料酸药转化;结构体;非晶转换;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号