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

Ramya Kiran, James Chapman, Alexander Forrest, Marc Tennant, Laurence J. Walsh

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    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™ 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 (405 nm) light, which enables their detection and differentiation from natural tooth structure.

    Original languageEnglish
    Pages (from-to)20-28
    Number of pages9
    JournalForensic Science International
    Volume273
    DOIs
    Publication statusPublished - 1 Apr 2017

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