Repository logo
 
Publication

Femtosecond laser ablation of dentin

2012-06-20Journal article Open access
Simple item page
dc.contributor.authorAlves, S.
dc.contributor.authorOliveira, Vitor
dc.contributor.authorVilar, Rui
dc.date.accessioned2012-09-11T13:53:41Z
dc.date.available2012-09-11T13:53:41Z
dc.date.issued2012-06-20
dc.description.abstractThe surface morphology, structure and composition of human dentin treated with a femtosecond infrared laser (pulse duration 500 fs, wavelength 1030 nm, fluences ranging from 1 to 3 J cm(-2)) was studied by scanning electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The average dentin ablation threshold under these conditions was 0.6 +/- 0.2 J cm(-2) and the ablation rate achieved in the range 1 to 2 mu m/pulse for an average fluence of 3 J cm(-2). The ablation surfaces present an irregular and rugged appearance, with no significant traces of melting, deformation, cracking or carbonization. The smear layer was entirely removed by the laser treatment. For fluences only slightly higher than the ablation threshold the morphology of the laser-treated surfaces was very similar to the dentin fracture surfaces and the dentinal tubules remained open. For higher fluences, the surface was more porous and the dentin structure was partially concealed by ablation debris and a few resolidified droplets. Independently on the laser processing parameters and laser processing method used no sub-superficial cracking was observed. The dentin constitution and chemical composition was not significantly modified by the laser treatment in the processing parameter range used. In particular, the organic matter is not preferentially removed from the surface and no traces of high temperature phosphates, such as the beta-tricalcium phosphate, were observed. The achieved results are compatible with an electrostatic ablation mechanism. In conclusion, the high beam quality and short pulse duration of the ultrafast laser used should allow the accurate preparation of cavities, with negligible damage of the underlying material.por
dc.identifier.citationAlves S, Oliveira V, Vilar R. Femtosecond laser ablation of dentin. Journal of Physics D-Applied Physics. 2012: 45 (24), 4501.por
dc.identifier.issn0022-3727
dc.identifier.urihttp://hdl.handle.net/10400.21/1769
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherIop Publishing LTDpor
dc.subjectND-Yag laserpor
dc.subjectCanal-wall dentinpor
dc.subjectPulse durationpor
dc.subjectBond strengthpor
dc.subjectCrater depthpor
dc.subjectErbium laserpor
dc.subjectIn-vitropor
dc.subjectIrradiationpor
dc.subjectEnamelpor
dc.subjectCO2-Laserpor
dc.titleFemtosecond laser ablation of dentinpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceTemple Waypor
oaire.citation.endPage45401por
oaire.citation.issue24por
oaire.citation.startPage45401por
oaire.citation.titleJournal of Physics D-Applied Physicspor
oaire.citation.volume45por
person.familyNameOliveira
person.givenNameVitor
person.identifier.ciencia-idDA1C-25BD-5974
person.identifier.orcid0000-0002-1757-4524
person.identifier.ridA-3058-2009
person.identifier.scopus-author-id7006105706
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication269ff9af-427f-4d1d-949c-cd77cd386e9f
relation.isAuthorOfPublication.latestForDiscovery269ff9af-427f-4d1d-949c-cd77cd386e9f

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Femtosecond laser ablation of dentin.rep.pdf
Size:
19.21 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ISEL - Física - Artigos