Effects of lasers on chemical composition of anamel and dentin
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2009
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ANNUAL CONFERENCE OF AMERICAN SOCIETY FOR LASER MEDICINE AND SURGERY, 29th
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Background: Laser irradiation is a promising alternative for caries prevention due to the possibility of changing the
microstructure of dental hard tissues. However, the chemical
changes promoted by infrared lasers interaction with dental hard tissue are still unclear. This study investigated chemical and erystallographic changes on enamel and dentin after irradiation
with Nd:YAG and Fr,Cr:YSGG lasers aiming caries prevention,
Study: Thirty enamel and dentin slabs were obtained from bovine teeth, and wore randomly distributted into six groups: G1-
unlased enamel; G2- unlased dentin; G3- enamel irradiated with Er,Cr:YSGG laser (o =2.78 ym) at 5.6 J/em? (25 mJ/pulse);
Gd- dentin irradiated with Er,Cr:YSGG at 2.8 J/em? (12.5 mJ/
pulse); G5- enamel irradiated with Nd:YAG laser (> = 1.064 ym) at
84.9 J/em? (60 mJ/pulze), and G6- dentin irradiated with Nd:YAG at 84.9 J/em? (60 md/pulse). Sample surfaces were analyzed by micro-Fourier transform infrared spectroscopy (11-FTIR) at 4000-650 cm ' range and with 4 em”* resolution. After p-FTIR, samples were also evaluated by X-ray diffraction at a Synchrotron
monochromatic X-ray beam (Cu-Ka, wavelength of 0.0954 nm).
Results: Irradiation with Er,CAYSGG laser promoted the
decrease on carbonate content of enamel. After Nd:YAG
irradiation, it was observed a significant decrease (p < 0.05) of all
organic content of enamel, Er,Cr:YSGG and Nd:YAG lasers
promoted a significant decrease on the contents of amides 1 and
carbonate of dentin. Both laser irradiations also promoted the
formation of tricalcium and tetracalcium phosphates, and also a significant increase (p < 0.05) on the crystal growth of the apatite
of enamel and dentin.
Conclusion: In conclusion, high IR intensity laser irradiation
changes mainly the organic and carbonate contents of both
enamel and dentin, as well promotes an increase in crystallite sizes and the formation of new crystallographic phases. These
changes can be correlated with the mechanism of the improved
resistance of these tissues to demineralization observed in our previous studies.
Como referenciar
ZEZELL, DENISE; ANA, PATRICIA; ALBERO, FELIPE; BACHMANN, LUCIANO. Effects of lasers on chemical composition of anamel and dentin. In: ANNUAL CONFERENCE OF AMERICAN SOCIETY FOR LASER MEDICINE AND SURGERY, 29th, April 1-5, 2009, Washington. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/22838. Acesso em: 21 Mar 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.