2D mapping of texture and lattice parameters of dental enamel

Al-Jawad, M; Steuwer, A; Kilcoyne, SH; Shore, RC; Cywinski, R; Wood, DJ

Abstract

We have used synchrotron X-ray diffraction to study the texture and the change in lattice parameter as a function of position in a cross
section of human dental enamel. Our study is the first to map changes in preferred orientation and lattice parameter as a function of
position within enamel across a whole tooth section with such high resolution. Synchrotron X-ray diffraction with a micro-focused beam
spot was used to collect two-dimensional (2D) diffraction images at 150 mm spatial resolution over the entire tooth crown. Contour maps
of the texture and lattice parameter distribution of the hydroxyapatite phase were produced from Rietveld refinement of diffraction
patterns generated by azimuthally sectioning and integrating the 2D images. The 002 Debye ring showed the largest variation in
intensity. This variation is indicative of preferred orientation. Areas of high crystallite alignment on the tooth cusps match the expected
biting surfaces. Additionally we found a large variation in lattice parameter when travelling from the enamel surface to the enameldentine
junction. We believe this to be due to a change in the chemical composition within the tooth. The results provide a new insight on
the texture and lattice parameter profiles within enamel.

Citation

Al-Jawad, M., Steuwer, A., Kilcoyne, S., Shore, R., Cywinski, R., & Wood, D. 2D mapping of texture and lattice parameters of dental enamel. Biomaterials, 28, 2908-2914. https://doi.org/10.1016/j.biomaterials.2007.02.019

• Journal Article Type: Article
• Deposit Date: Oct 1, 2010
• Journal: Biomaterials
• Print ISSN: 0142-9612
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 28
• Pages: 2908-2914
• DOI: https://doi.org/10.1016/j.biomaterials.2007.02.019
• Publisher URL: http://dx.doi.org/10.1016/j.biomaterials.2007.02.019