LUCIANO BACHMANN
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Resumo IPEN-doc 14584 Effects of lasers on chemical composition of anamel and dentin2009 - ZEZELL, DENISE; ANA, PATRICIA; ALBERO, FELIPE; BACHMANN, LUCIANOBackground: 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.Resumo IPEN-doc 14135 Evaluation of thermal stability of human dental tissue using fourier transform infrared spectroscopy2009 - MARTINS, LAIS; BACHMANN, LUCIANO; ALBERO, FELIPE; PEREIRA, THIAGO; ZEZELL, DENISEResumo IPEN-doc 14134 Influence of Er, Cr:YSGG and Nd:YAG laser on enamel and dentin composition when irradiated at preventive purposes2009 - ANA, PATRICIA A. da; ALBERO, FELIPE G.; ZEZELL, DENISE M.; BACHMANN, LUCIANOResumo IPEN-doc 16400 Effects of lasers on chemical composition on enamel and dentin2009 - ZEZELL, DENISE; ANA, PATRICIA; ALBERO, FELIPE; BACHMANN, LUCIANOResumo IPEN-doc 14742 Effect of infrared lasers on chemical and crystalline properties of enamel2009 - ZEZELL, D.M.; ANA, P.A.; ALBERO, F.G.; CURY, J.A.; BACHMANN, L.