Determination of ablation threshold for composite resins and amalgam irradiated with femtosecond laser pulses
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The use of laser for caries removal and cavity preparation is already a reality in the dental clinic. The objective of
the present study was to consider the viability of ultrashort laser
pulses for restorative material selective removal, by determining
the ablation threshold fluence for composite resins and amalgam
irradiated with femtosecond laser pulses. Lasers pulses centered
at 830 nm with 50 fs of duration and 1 kHz of repetition rate,
with energies in the range of 300 to 770 μJ were used to irradiate
the samples. The samples were irradiated using two different geometrical methods for ablation threshold fluence determinations
and the volume ablation was measured by optical coherence tomography. The shape of the ablated surfaces were analyzed by
optical microscopy and scanning electron microscopy. The determined ablation threshold fluence is 0.35 J/cm2 for the composite
resins Z-100 and Z-350, and 0.25 J/cm2 for the amalgam. These
values are half of the value for enamel in this temporal regime.
Thermal damages were not observed in the samples. Using the
OCT technique (optical coherence tomography) was possible to
determine the ablated volume and the total mass removed.
Como referenciar
FREITAS, A.Z.; FRESCHI, L.R.; SAMAD, R.E.; ZEZELL, D.M.; GOUW SOARES, S.C.; VIEIRA JUNIOR, N.D. Determination of ablation threshold for composite resins and amalgam irradiated with femtosecond laser pulses. Laser Physics, v. 7, n. 3, p. 236-241, 2010. DOI: 10.1002/lapl.200910133. Disponível em: http://repositorio.ipen.br/handle/123456789/4727. Acesso em: 30 Dec 2025.
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.