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

Zhang, Fan; Allen, Andrew J.; Levine, Lyle E.; Vaudin, Mark D.; Skrtic, Drago; Antonucci, Joseph M.; Hoffman, Kathleen M.; Giuseppetti, Anthony A.; Ilavsky, Jan

doi:10.1016/j.dental.2014.07.003

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

Journal Article · Mon Jul 28 00:00:00 EDT 2014 · Dental Materials

DOI:https://doi.org/10.1016/j.dental.2014.07.003· OSTI ID:1263633

Zhang, Fan ^[1]; Allen, Andrew J. ^[1]; Levine, Lyle E. ^[1]; Vaudin, Mark D. ^[1]; Skrtic, Drago ^[2]; Antonucci, Joseph M. ^[1]; Hoffman, Kathleen M. ^[2]; Giuseppetti, Anthony A. ^[2]; Ilavsky, Jan ^[3]

National Institute of Standards and Technology, Gaithersburg, MD (United States)
American Dental Assoc. Foundation, Gaithersburg, MD (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Our objective was to investigate the complex structural and dynamical conversion process of the amorphous-calcium-phosphate (ACP)-to-apatite transition in ACP based dental composite materials. 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. 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. Significantly, for the first time, we were able to follow the complete solution-mediated transition process from ACP to apatite in this class of dental composites in a controlled aqueous environment. A two-step process, suggested previously, was conclusively identified.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1263633

Alternate ID(s):: OSTI ID: 1227546

Journal Information:: Dental Materials, Journal Name: Dental Materials Journal Issue: 10 Vol. 30; ISSN 0109-5641

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
ACP-based composites
acid-medicated conversion
amorphous calcium phosphate
amorphous conversion
dental composites
dental material
structure

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

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