Optical penetration models for practical prediction of femtosecond laser ablation of dental hard tissue.
ablation
dentin
enamel
femtosecond laser
laser dentistry
model
Journal
Lasers in surgery and medicine
ISSN: 1096-9101
Titre abrégé: Lasers Surg Med
Pays: United States
ID NLM: 8007168
Informations de publication
Date de publication:
02 Apr 2024
02 Apr 2024
Historique:
revised:
30
01
2024
received:
27
10
2023
accepted:
20
03
2024
medline:
2
4
2024
pubmed:
2
4
2024
entrez:
2
4
2024
Statut:
aheadofprint
Résumé
To develop and practically test high-precision femtosecond laser ablation models for dental hard tissue that are useful for detailed planning of automated laser dental restorative treatment. Analytical models are proposed, derived, and demonstrated for practical calculation of ablation rates, ablation efficiency and ablated morphology of human dental enamel and dentin using femtosecond lasers. The models assume an effective optical attenuation coefficient for the irradiated material. To achieve ablation, it is necessary for the local energy density of the attenuated pulse in the hard tissue to surpass a predefined threshold that signifies the minimum energy density required for material ionization. A 1029 nm, 40 W carbide 275 fs laser was used to ablate sliced adult human teeth and generate the data necessary for testing the models. The volume of material removed, and the shape of the ablated channel were measured using optical profilometry. The models fit with the measured ablation efficiency curve against laser fluence for both enamel and dentin, correctly capturing the fluence for optimum ablation and the volume of ablated material per pulse. The detailed shapes of a 400-micrometer wide channel and a single-pulse width channel are accurately predicted using the superposition of the analytical result for a single pulse. The findings have value for planning automated dental restorative treatment using femtosecond lasers. The measurements and analysis give estimates of the optical properties of enamel and dentin irradiated with an infrared femtosecond laser at above-threshold fluence and the proposed models give insight into the physics of femtosecond laser processing of dental hard tissue.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© 2024 The Authors. Lasers in Surgery and Medicine published by Wiley Periodicals LLC.
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