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Forensic applications: Fluorescence properties of tooth-coloured restorative materials using a fluorescence DSLR camera

journal contribution
posted on 2018-05-16, 00:00 authored by Ramya Kiran, LJ Walsh, A Forrest, M Tennant, James Chapman
The objective of this study was to compare the fluorescence properties of dry and wet samples of contemporary tooth-coloured restorative materials using a fluorescence based DSLR camera and a variety of LEDs emitting different wavelengths of visible light as excitation sources. The materials examined included resin composites; ceramics and hybrid restorative materials such as ormocers, Vita Enamic™ and resin reinforced glass-ionomer cements. The levels of fluorescence for each sample under different combinations of incident light wavelengths and filters was analysed by using histogram data for colour channels from Adobe Photoshop software. Fluorescence patterns were influenced by water sorption of the materials. UV-A/Violet light (405±nm) produced the greatest range of luminosity values (10-204) amongst the tooth-coloured restorative materials, and showed the greatest differences between restorations and tooth structure. The best filter combinations with violet light were orange or yellow filters. Under ultraviolet excitation, Fuji VIII A2 exhibited a unique bright pink fluorescence emission, while VitaEnamic™, ormocer and glass-ionomer cements emitted bluish-pink fluorescence emissions. In conclusion, restorative materials exhibited varied emission pattern under UV-A (405nm) light, which enables their detection and differentiation from natural tooth structure.

Funding

Category 2 - Other Public Sector Grants Category

History

Volume

273

Start Page

20

End Page

28

Number of Pages

9

eISSN

1872-6283

ISSN

0379-0738

Location

Ireland

Publisher

Elsevier

Language

eng

Peer Reviewed

  • Yes

Open Access

  • No

Acceptance Date

2017-01-21

External Author Affiliations

Griffith University; University of Western Australia

Era Eligible

  • Yes

Journal

Forensic Science International