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Proceedings Paper

Evaluation of the effect of a CO2 laser and fluoride on the reduction of carious lesions progression in primary teeth: an in vitro study
Author(s): Bruna R. Zancopé; Marina Moron C. Cesar; Lidiany Karla A. Rodrigues; Marinês Nobre-dos-Santos
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Paper Abstract

This study aimed at investigating if CO2 laser irradiation (λ =10.6μm - 11.3 J/cm2) combined with fluoridated products, enhances the CaF2 formation on enamel surface and inhibits lesion progression of demineralized primary enamel. Thus, 135 demineralized primary enamel specimens (DES) were allocated to 9 groups (n=15) as follows: 1- DES only, 2- DES + pH cycling (control), 3- 1.23% acidulated phosphate fluoride gel (APF), 4- 1.23% fluoride foam (FF), 5- 5% fluoride varnish (FV), 6- CO2 Laser (L), 7 - Laser during APF application, 8-Laser during FF application and 9-Laser during FV application. Except for the demineralized enamel group, all specimens were submitted to a 7 day pH cycling regime. The knoop hardness number (KHN) was determined by cross-sectional microhardness analysis. After treatments application, three specimens of each group had their surface examined for CaF2 formation by scanning electron microscopy (SEM). The data was analyzed by ANOVA and Student's t-test (α= 0.05). Enamel mineral loss (ΔS) for groups 1 to 9 were respectively,(8,676.28±1,077.46b),(12,419.54±1,050.21a),(8,156.80±1,279.90b),(8,081.32±1,019.69b),(8,820.86±1,805. 99b),(8,723.45±1,167.14b),(9,003.17±796.90b),(8.229,03±961.25b),(9,023.32±1,1069b). The results showed statistically significant difference between control and all treatments groups (p<0.05). However there was no difference among them (p>0.05). SEM observations showed evidences of melting, fusion and calcium fluoride formation on enamel surface. In conclusion, laser irradiation alone or combined with fluoridated products inhibited lesion progression of demineralized primary enamel surface. However, no synergistic effect was observed when CO2 laser irradiation and fluoridated products application were combined.

Paper Details

Date Published: 18 February 2014
PDF: 9 pages
Proc. SPIE 8929, Lasers in Dentistry XX, 89290K (18 February 2014); doi: 10.1117/12.2037284
Show Author Affiliations
Bruna R. Zancopé, Univ. Estadual de Campinas (Brazil)
Marina Moron C. Cesar, Univ. Estadual de Campinas (Brazil)
Lidiany Karla A. Rodrigues, Federal Univ. of Ceará (Brazil)
Marinês Nobre-dos-Santos, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 8929:
Lasers in Dentistry XX
Peter Rechmann; Daniel Fried, Editor(s)

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