Project/scholarship details
- Project/scholarship ID
37944
- Reference
POCTI/ESP/37944/2001
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
POCI
- Funding amount
25,000.00 €
- Start date
2002-03-01
- End date
2005-04-30
Documents
Modelling of the human enamel laser ablation process at the mesoscopic scale
Vila Verde, A.; Ramos, Marta M. D.; Ribeiro, R. M.; Stoneham, A. M.Comunidade Europeia (CE). Fundo Europeu de Desenvolvimento Regional (FEDER).; A mesoscopic simulation of the process of human enamel laser ablation by Er:YAG and CO2 lasers is being developed using the finite element method, taking into account the complex structure and chemical composition of this material. A geometric model that allows studying in detail the temperature, stress and displacement distribution w...
Mesoscopic modelling of the interaction of infrared lasers with composite mater...
Vila Verde, A.; Ramos, Marta M. D.; Stoneham, A. M.; Ribeiro, R. M.The mesostructure and composition of composite materials determine their mechanical, optical and thermal properties and, consequently, their response to incident radiation. We have developed general finite element models of porous composite materials under infrared radiation to examine the influence of pore size on one of the determining parameters of the stress distribution in the material: the temperature dis...
Mechanical and thermal response of enamel to IR radiation - a finite element me...
Vila Verde, A.; Ramos, Marta M. D.We present finite element models of human dental enamel that account for water-pores known to exist in this material, and use them to assess the influence of these pores on the temperature and stress profiles during and after single Er:YAG (2.9 µm) and CO2 (10.6 µm) laser pulses of duration 0.35 µs. Our results indicate that the temperature maximum is reached at the water-pores at the end of the laser pulse; th...
Boundary conditions for 3-D dynamic models of ablation of ceramics by pulsed mi...
Vila Verde, A.; Ramos, Marta M. D.We present and discuss a set of boundary conditions (BCs) to use in three-dimensional, mesoscopic, finite element models of mid-infrared pulsed laser ablation of brittle materials. These models allow the study of the transient displacement and stress fields generated at micrometer scales during and after one laser pulse, where using conventional BCs may lead to some results without physical significance that ca...
The influence of pulse duration on the stress levels in ablation of ceramics: A...
Vila Verde, A.; Ramos, Marta M. D.We present a finite element model to investigate the dynamic thermal and mechanical response of ceramic materials to pulsed infrared radiation. The model was applied to the specific problem of determining the influence of the pulse duration on the stress levels reached in human dental enamel irradiated by a CO2 laser at 10.6 mm with pulse durations between 0.1 and 100 ms and sub-ablative fluence. Our results in...
The role of mesoscopic modelling in understanding the response of dental enamel...
Vila Verde, A.; Ramos, Marta M. D.; Stoneham, A. M.Human dental enamel has a porous mesostructure at the nanometre to micrometer scales that affects its thermal and mechanical properties relevant to laser treatment. We exploit finite element models to investigate the response of this mesostructured enamel to mid infrared lasers (CO2 at 10.6 mm and Er:YAG at 2.94 mm). Our models might easily be adapted to investigate ablation of other brittle composite materials...
Report
Embed
<script type="text/javascript">
<!--
document.write('<div id="rcaap-widget"></div>');
document.write('<script type="text/javascript" src="https://www.rcaap.pt/snippet?resource=documents&project=FCT%2FPOCI%2F37944&fields=id,titles,creators,issueDate,link,descriptions"></script>');
-->
</script>