Low fluence CO2 laser (10.6 μm) parameters for caries prevention
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Caries Research
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Although CO 2 laser irradiation can decrease enamel demineralization,
thermal damage to the surface is a common side effect.
The occurrence of fissures and cracks may compromise in
vivo application. Therefore, the aim of the present study was to
find CO 2 laser (10.6 μm) parameters resulting in maximum caries-
preventive effect with the lowest thermal damage. Five low
fluences of 0.12, 0.29, 0.39, 0.50 and 0.60 J/cm 2 combined with
high repetition rates of 500, 154, 167, 182, 187 Hz, respectively and
10 μs pulse duration were chosen for the experiments. 78 bovine
enamel cubes were divided into 5 laser groups and one control.
After treatment the samples were submitted to an 8-day pH-cycling
regime. Demineralization was assessed by lesion depth measurements
with a polarized-light microscope. The temperature
rise at the enamel surface and the propagation into deeper layers
were calculated using a finite element model. Surface morphology
was evaluated by SEM. All laser groups resulted in statistically
significant lower lesion depths than the control group (ANOVA;
p < 0.05). Morphologically, the two lowest fluences resulted in no
surface changes. The calculated temperature rise at 1.5 mm depth
was less than 5 ° C in all groups. In the present in vitro study irradiation
with 0.12 J/cm 2 , 500 Hz and 2500 pulses of CO 2 laser
increased enamel caries resistance without causing undesirable
surface damage or excessive temperature rise.
Como referenciar
ESTEVES-OLIVEIRA, M.; ZEZELL, D.M.; VELLOSO, W.F.; MEISTER, J.; FRANZEN, R.; LAMPERT, F.; EDUARDO, C.P.; APEL, C. Low fluence CO2 laser (10.6 μm) parameters for caries prevention. Caries Research, v. 41, n. 4, p. 325-325, 2007. DOI: 10.1159/000103637. Disponível em: http://repositorio.ipen.br/handle/123456789/34051. 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.