Mercury amalgam diffusion in human teeth probed using femtosecond LIBS
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Applied Spectroscopy
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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 μm.
Como referenciar
BELLO, LICIANE T.; ANA, PATRICIA A. da; SANTOS JUNIOR, DARIO; KRUG, FRANCISCO J.; ZEZELL, DENISE M.; VIEIRA JUNIOR, NILSON D.; SAMAD, RICARDO E. Mercury amalgam diffusion in human teeth probed using femtosecond LIBS. Applied Spectroscopy, v. 71, n. 4, p. 659-669, 2017. DOI: 10.1177/0003702816687572. Disponível em: http://repositorio.ipen.br/handle/123456789/27029. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.