Ultra-small-angle X-ray scattering–X-ray photon correlation spectroscopy studies of incipient structural changes in amorphous calcium phosphate-based dental composites †

  1. Fan Zhang1,2,*,
  2. Andrew J. Allen1,
  3. Lyle E. Levine1,
  4. Laura Espinal1,
  5. Joseph M. Antonucci1,
  6. Drago Skrtic3,
  7. Justin N. R. O'Donnell3,
  8. Jan Ilavsky4

Article first published online: 28 FEB 2012

DOI: 10.1002/jbm.a.34018

Issue

Journal of Biomedical Materials Research Part A

Journal of Biomedical Materials Research Part A

Volume 100A, Issue 5, pages 1293–1306, May 2012

Additional Information

How to Cite

Zhang, F., Allen, A. J., Levine, L. E., Espinal, L., Antonucci, J. M., Skrtic, D., O'Donnell, J. N. R. and Ilavsky, J. (2012), Ultra-small-angle X-ray scattering–X-ray photon correlation spectroscopy studies of incipient structural changes in amorphous calcium phosphate-based dental composites . J. Biomed. Mater. Res., 100A: 1293–1306. doi: 10.1002/jbm.a.34018

Author Information

  1. 1

    Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899

  2. 2

    Department of Physics, Northern Illinois University, DeKalb, Illinois 60115

  3. 3

    Paffenbarger Research Center, American Dental Association Foundation, Gaithersburg, Maryland 20899

  4. 4

    X-ray Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439

*Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899

  1. †

    How to cite this article: Zhang F, Allen AJ, Levine LE, Espinal L, Antonucci JM, Skrtic D, O'Donnell Justin N. R., Ilavsky J. 2012. Ultra-small-angle X-ray scattering-X-ray photon correlation spectroscopy studies of incipient structural changes in amorphous calcium phosphate-based dental composites. J Biomed Mater Res Part A 2012:100A:1293–1306.

Publication History

  1. Issue published online: 22 MAR 2012
  2. Article first published online: 28 FEB 2012
  3. Manuscript Accepted: 17 OCT 2011
  4. Manuscript Revised: 13 OCT 2011
  5. Manuscript Received: 8 JUN 2011

Funded by

  • National Institute of Dental and Craniofacial Research (NIDCR). Grant Number: DE 13169
  • U.S. DOE. Grant Number: DE-AC02-06CH11357

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Keywords:

  • amorphous calcium phosphate;
  • polymeric dental composites;
  • microstructure;
  • ultra-small-angle X-ray scattering;
  • X-ray photon-correlation spectroscopy

Abstract

The local structural changes in amorphous calcium phosphate (ACP)-based dental composites were studied under isothermal conditions using both static, bulk measurement techniques and a recently developed methodology based on combined ultra-small angle X-ray scattering–X-ray photon correlation spectroscopy (USAXS–XPCS), which permits a dynamic approach. While results from conventional bulk measurements do not show clear signs of structural change, USAXS–XPCS results reveal unambiguous evidence for local structural variations on a similar time scale to that of water loss in the ACP fillers. A thermal-expansion-based simulation indicates that thermal behavior alone does not account for the observed dynamics. Together, these results suggest that changes in the water content of ACP affect the composite morphology due to changes in ACP structure that occur without an amorphous-to-crystalline conversion. It is also noted that biomedical materials research could benefit greatly from USAXS–XPCS, a dynamic approach. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 2012.

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