Ablation threshold for composite resins and amalgam irradiated with femtosecond pulse laser
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2007
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SIMPOSIO DE INSTRUMENTACAO E IMAGENS MEDICAS, 3.
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Resumo
The dental treatment using laser has been of great
interest for many years, since laser interaction with
tissue and other materials can be used for cavity
preparation. The objective of the present study was to
determine the fluency ablation threshold for composite
resins and amalgam irradiated with femtosecond pulse
laser (Ti:Sapphire). The laser operates at 830 nm, with
50 fs pulse duration and 1 kHz of repetition rate.
Different energies were used in the samples irradiation
(300 to 770 μJ). The samples were irradiated using with
a computerized translation stage and two different
methods and the volume ablation was determined by
optical coherence tomography. After images analysis
obtained by optical microscopy and scanning electron
microscopy, the determined ablation threshold fluency
was 0,35 J/cm2
for the composite resin Z-100 and Z350, and 0,25 J/cm2
for the amalgam. Thermal damage
was not observed in none of the samples.
Como referenciar
FRESCHI, L.R.; FREITAS, A.Z.; ZEZELL, DENISE M.; VIEIRA JUNIOR, NILSON D. Ablation threshold for composite resins and amalgam irradiated with femtosecond pulse laser. In: SIMPOSIO DE INSTRUMENTACAO E IMAGENS MEDICAS, 3., 7-9 de nov., 2007, Sao Carlos, SP. Anais... Disponível em: http://repositorio.ipen.br/handle/123456789/18430. Acesso em: 20 Mar 2026.
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