Mercury Amalgam Diffusion in Human Teeth Probed Using Femtosecond LIBS

Mercury Amalgam Diffusion in Human Teeth Probed Using Femtosecond LIBS

Author Bello, Liciane Toledo Google Scholar
da Ana, Patricia Aparecida Google Scholar
Santos, Dario, Jr. Autor UNIFESP Google Scholar
Krug, Francisco Jose Google Scholar
Zezell, Denise Maria Google Scholar
Vieira, Nilson Dias, Jr. Google Scholar
Samad, Ricardo Elgul Google Scholar
Abstract In this work the diffusion of mercury and other elements from amalgam tooth restorations through the surrounding dental tissue (dentin) was evaluated using femtosecond laser-induced breakdown spectroscopy (fs-LIBS). To achieve this, seven deciduous and eight permanent extracted human molar teeth with occlusal amalgam restorations were half-sectioned and analyzed using pulses from a femtosecond laser. The measurements were performed from the amalgam restoration along the amalgam/dentin interface to the apical direction. It was possible to observe the presence of metallic elements (silver, mercury, copper and tin) emission lines, as well as dental constituent ones, providing fingerprints of each material and comparable data for checking the consistence of the results. It was also shown that the elements penetration depth values in each tooth are usually similar and consistent, for both deciduous and permanent teeth, indicating that all the metals diffuse into the dentin by the same mechanism. We propose that this diffusion mechanism is mainly through liquid dragging inside the dentin tubules. The mercury diffused further in permanent teeth than in deciduous teeth, probably due to the longer diffusion times due to the age of the restorations. It was possible to conclude that the proposed femtosecond-LIBS system can detect the presence of metals in the dental tissue, among the tooth constituent elements, and map the distribution of endogenous and exogenous chemical elements, with a spatial resolution that can be brought under 100 mu m.
Keywords Laser-induced breakdown spectroscopy
femtosecond LIBS
dental restoration
xmlui.dri2xhtml.METS-1.0.item-coverage Thousand Oaks
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [04/15965-2, 05/51689-2, 06/06746-0]
Conselho Nacional de Desenvolvimento Cientifico e Tecnonlogico (CNPq) [573.916/08-0, 309800/11-0, 482499/12-5, 306616/12-2, 312397/13-5, 307803/15-5]
Date 2017
Published in Applied Spectroscopy. Thousand Oaks, v. 71, n. 4, p. 659-669, 2017.
ISSN 0003-7028 (Sherpa/Romeo, impact factor)
Publisher Sage Publications Inc
Extent 659-669
Access rights Closed access
Type Article
Web of Science ID WOS:000399927700010

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