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15 February 2006 Effects of the CO2 laser combined with fluoridated toothpaste on human dental enamel demineralization
Lidiany Karla Azevedo Rodrigues, Evelyn Alvarez Vidigal, Luís Eduardo Silva Soares, Airton Abrahão Martin, Aldo Brugnera-Júnior, Fátima Antonia Aparecida Zanin D.D.S., Marinês Nobre dos Santos
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Proceedings Volume 6137, Lasers in Dentistry XII; 61370Q (2006) https://doi.org/10.1117/12.648971
Event: SPIE BiOS, 2006, San Jose, California, United States
Abstract
This in vitro pilot study investigated the CO2 laser effects on demineralization inhibition in sound human dental enamel. Thirty six human enamel specimens were used and randomly assigned to 6 groups, as follows: I) Control; II) 1W; III) 2W; IV) 3W; V) 4W; VI) 5W. Group I one was kept as control and others were irradiated using a pulsed CO2 laser (λ=10.6 μm) with low crescent potencies. Fourier Transform Raman Spectroscopy was used to study the surface composition of specimens after irradiation. One specimen from each group was analyzed by Scanning Electron Microscopy and the remaining ones were submitted to an 8-day pH cycling model with use of fluoridated toothpaste twice a day. After pH-cycling, the cross-sectional microhardness was performed for mineral loss (ΔZ) quantification. The data were analyzed by ANOVA and Tuckey test (α=0.05). No changes were found either in SEM photomicrographies or RAMAN Spectra of the specimens in all groups. The ΔZ values (n=5; mean±SD) for I-VI groups were: 1741.6±725.3a; 1782.7±639.0a; 1427.2±237.0a; 1780.6±552.4a; 1385.2±602.2a; 943.1±228.1a respectively. The highest percentage of caries inhibition was found in group VI (45.8%); however the differences between ΔZ of the groups were not statistically significant. The use of CO2 laser with low fluencies did not prevent more caries development than the use of fluoridated toothpaste, even though group VI had present good results in caries inhibition. Energy densities higher than 0.0125 J/cm2 should be used to promote chemical or morphological changes on enamel surface, which are able of inhibiting mineral.
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Lidiany Karla Azevedo Rodrigues, Evelyn Alvarez Vidigal, Luís Eduardo Silva Soares, Airton Abrahão Martin, Aldo Brugnera-Júnior, Fátima Antonia Aparecida Zanin D.D.S., and Marinês Nobre dos Santos "Effects of the CO2 laser combined with fluoridated toothpaste on human dental enamel demineralization", Proc. SPIE 6137, Lasers in Dentistry XII, 61370Q (15 February 2006); https://doi.org/10.1117/12.648971
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KEYWORDS
Gas lasers
Carbon monoxide
Minerals
Raman spectroscopy
Laser dentistry
Dental caries
Scanning electron microscopy
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