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hal.structure.identifierInstituto Superior Técnico and CeFEMA (Center of Physics and Engineering of Advanced Materials)
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLE, Quang Tri
hal.structure.identifierInstituto Superior Técnico and CeFEMA (Center of Physics and Engineering of Advanced Materials)
dc.contributor.authorVILAR, Rui
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBERTRAND, Caroline
dc.date.issued2017-12
dc.identifier.issn0268-8921
dc.description.abstractEnIn the present work, the influence of external cooling on the temperature rise in the tooth pulpal chamber during femtosecond laser ablation was investigated. The influence of the cooling method on the morphology and constitution of the laser-treated surfaces was studied as well. The ablation experiments were performed on dentin specimens using an Yb:KYW chirped-pulse-regenerative amplification laser system (560 fs, 1030 nm). Cavities were created by scanning the specimens at a velocity of 5 mm/s while pulsing the stationary laser beam at 1 kHz and with fluences in the range of 2–14 J/cm2. The experiments were performed in air and with surface cooling by a lateral air jet and by a combination of an air jet and water irrigation. The temperature in the pulpal chamber of the tooth was measured during the laser experiments. The ablation surfaces were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The temperature rise reached 17.5 °C for the treatments performed with 14 J/cm2 and without cooling, which was reduced to 10.8 ± 1.0 and 6.6 ± 2.3 °C with forced air cooling and water cooling, respectively, without significant reduction of the ablation rate. The ablation surfaces were covered by ablation debris and resolidified droplets containing mainly amorphous calcium phosphate, but the amount of redeposited debris was much lower for the water-cooled specimens. The redeposited debris could be removed by ultrasonication, revealing that the structure and constitution of the tissue remained essentially unaltered. The present results show that water cooling is mandatory for the femtosecond laser treatment of dentin, in particular, when high fluences and high pulse repetition rates are used to achieve high material removal rates.
dc.language.isoen
dc.publisherSpringer Verlag
dc.title.enInfluence of external cooling on the femtosecond laser ablation of dentin
dc.typeArticle de revue
dc.identifier.doi10.1007/s10103-017-2277-8
dc.subject.halChimie/Matériaux
bordeaux.journalLasers in Medical Science
bordeaux.page1943-1951
bordeaux.volume32
bordeaux.issue9
bordeaux.peerReviewedoui
hal.identifierhal-02489931
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02489931v1
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