Q-switched Nd:YAG laser on dental enamel with photoabsorber
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2020
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VIRTUAL RAMAN IMAGING POSTER SUMMIT, 1st; INTERNATIONAL CONFERENCE FOR CHEMICAL CHARACTERIZATION & IMAGING
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Nd:YAG lasers emitting λ = 1064 nm at microsecond and nanosecond pulses are alternatives to prevent
dental caries and erosion in clinics. This wavelength allows most of photons to penetrate deep in the hard
tissue due to low absorption of hydroxyapatite in the region. It is necessary to use photoabsorbers so most of
photons are absorbed in the surface of the tissue preventing dental pulp necrosis. Currently the coal paste is
used as a photoabsorber but the irradiated tissue turns darker what implies in the patients low adherence to
the treatment due to aesthetic reasons. [1,2]. Confocal Raman spectroscopy is a non-destructive optical
method to obtain detailed information about molecular composition of biological structures in depth. The
most prominent feature of Confocal Raman spectroscopy is the reliable capability to provide the
biomolecular data with no use of ionizing radiation to penetrate in the sample. This work aims to characterize
the dental enamel irradiated with Nd:YAG laser with nanoseconds pulses, in order to describe the depth
related changes promoted in the enamel, by the heat generated due to laser irradiation. For these
measurements, 30 bovine enamel blocks of 8 mm2, were randomized into 3 groups: G1 – enamel untreated;
G2 – enamel irradiated with Nd:YAG nanopulsed laser (1064 nm, 4 W; 1,05 J/cm2; 5 ns 20 Hz, Brilliant,
Quantel Laser) using a coal paste as photoabsorber; G3 -enamel irradiated with Nd:YAG nanopulsed laser (
same parameters as G2) using squid ink as photoabsorber. The assessments of three different depth
regions of the cubic shaped samples were: region A- left corner above of the sample, region B-middle of the
sample and Region C- right corner below of the sample. The intensity map of phosphate (950 cm-1)
regarding the position, were calculated [3,4] as shown in the Figure 01. The comparative results in the Fig.1 demonstrated that application of coal paste associated with Nd:YAG
(G2) can preserve the inorganic content better than the squid ink group (G3). These findings have crucial
clinical implications in the laser protocol development and it was possible to correlate the heat penetration
depth of the laser irradiation with photoabsorber using the images obtained by the confocal Raman.
Como referenciar
CASTRO, P.; PEREIRA, D.; ANA, P.; MATOS, C.; ZEZELL, D. Q-switched Nd:YAG laser on dental enamel with photoabsorber: a confocal Raman pilot study. In: VIRTUAL RAMAN IMAGING POSTER SUMMIT, 1st; INTERNATIONAL CONFERENCE FOR CHEMICAL CHARACTERIZATION & IMAGING, September 28 - October 2, 2020, Online. Abstract... Ulm, Germany: WITec, 2020. p. 33-33. Disponível em: http://repositorio.ipen.br/handle/123456789/33303. 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.