Low-fluence CO2 laser irradiation decreases enamel solubility
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Laser Physics
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This study investigated whether subablative-pulsed CO2 laser (10.6 μm) irradiation, using fluences lower than 1 J/cm2, was capable of reducing enamel acid solubility. Fifty-one samples of bovine dental enamel were divided into three groups: control group, which was not irradiated (CG); group laser A (LA) irradiated with 0.3 J/cm2; and group laser B (LB) irradiated with 0.7 J/cm2. After irradiation, the samples were subjected to demineralization in an acetate buffer solution and were then analyzed by SEM. A finite-element model was used to calculate the temperature increase. The calcium and phosphorous content in the demineralization solution were measured with an ICP-OES. ANOVA and the t-test pairwise comparison (p < 0.016) revealed that LB showed significantly lower mean Ca and P content values in the demineralization solution than other groups. A reduction in the enamel solubility can be obtained with pulsed CO2 laser irradiation (0.7 J/cm2, 135 mJ/pulse, 74 Hz, 100 μs) without any surface photomodification and a less than 2°C temperature increase at a 3-mm depth from the surface.
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ESTEVES OLIVEIRA, M.; APEL, C.; GUTKNECHT, N.; VELLOSO JUNIOR, W.F.; COTRIM, M.E.B.; EDUARDO, C.P.; ZEZELL, D.M. Low-fluence CO2 laser irradiation decreases enamel solubility. Laser Physics, v. 18, n. 4, p. 478-485, 2008. DOI: 10.1134/S1054660X08040233. Disponível em: http://repositorio.ipen.br/handle/123456789/5086. Acesso em: 30 Dec 2025.
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.