ESTEVES-OLIVEIRA, M.ZEZELL, D.M.VELLOSO, W.F.MEISTER, J.FRANZEN, R.LAMPERT, F.EDUARDO, C.P.APEL, C.2023-05-172023-05-172007ESTEVES-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. <b>Caries Research</b>, v. 41, n. 4, p. 325-325, 2007. DOI: <a href="https://dx.doi.org/10.1159/000103637">10.1159/000103637</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/34051.0008-6568http://repositorio.ipen.br/handle/123456789/34051Although 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.325-325openAccessResumos em periódicos44110.1159/0001036370000-0001-7404-9606https://orcid.org/0000-0001-7404-960653.92Sem Percentil CiteScore