Ultrashort pulses over bovine dental enamel
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Brazilian Dental Journal
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The interaction of lasers with the hard structures of the teeth, has
found the excess of heat as a problem for its utilization. This
study analyzes, in vitro, the interaction of the ultrashort pulse
laser of Ti:safire (830 nm) with the bovine dental enamel.
The system consisted in one main oscillator integrated with an
amplifier (CPA). The pulses extracted before the temporal compression
inside the amplifier had 30ps, 1000Hz and ~1mJ. The
pulses extracted after the compression had 60fs, 1000Hz and
~0,7mJ. The M2 was 1,3, the focal lens 2,5 cm, the focal distance
29,7 and a computadorized translation stage x,y,z moved the sample.
We evaluated the amount of tissue removed per pulse,the resulting
cavities and the surrounding tissues not irradiated, under OM
and SEM.
The fluency was the major factor for differentiating the two regimens
studied, therefore, the intensity was not so important as we
expected in this process. We found: one ablation region in "cat
tonge", one ablation length, one fluency ~0,7J/cm2 for 30ps and
~0,5J/cm2 for 60fs (50% ofhigh speed burr), smooth edge for
30ps and high precision of the shrp edge cut of submicrometric
order for 60fs.
Como referenciar
TODESCAN, C.D.R.; VIEIRA JUNIOR, N.D.; SAMAD, R.E.; FREITAS, A.Z.; EDUARDO, C.P. Ultrashort pulses over bovine dental enamel. Brazilian Dental Journal, v. 15, p. 91-91, 2004. Special issue. Disponível em: http://repositorio.ipen.br/handle/123456789/32759. Acesso em: 20 Mar 2026.
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.