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

Chapman, J 2017, 'Forensic applications: Fluorescence properties of tooth-coloured restorative materials using a fluorescence DSLR camera', Forensic Science International, vol. 273, pp. 20-28.


Document type: Journal Article
Collection: Journal Articles

Title Forensic applications: Fluorescence properties of tooth-coloured restorative materials using a fluorescence DSLR camera
Author(s) Chapman, J
Year 2017
Journal name Forensic Science International
Volume number 273
Start page 20
End page 28
Total pages 9
Publisher Elsevier Ireland Ltd.
Abstract 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 TM 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 TM, ormocer and glass-ionomer cements emitted bluish-pink fluorescence emissions. In conclusion, restorative materials exhibited varied emission pattern under UV-A (405 nm) light, which enables their detection and differentiation from natural tooth structure.
Subject Analytical Chemistry not elsewhere classified
Keyword(s) Ceramics
Composite
Fluorescence
LED lights
Photography
UV light
DOI - identifier 10.1016/j.forsciint.2017.01.022
Copyright notice © 2017 Elsevier B.V.
ISSN 0379-0738
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