Primary experimental studies on mid-infrared FEL irradiation on dental substances at BFEL

Zhu, Jiang; Li, Yonggui; Liu, Nianqing; Zhang, Guoqing; Minkai, Wang; Wu, Gang; Xuepin, Yan; He, Wei; Yanmei, Dong; Gao, Xuejun

doi:10.1016/s0168-9002(01)01579-0

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…Our results suggest that nanosecond pulsed Nd:YAG laser can be used, to conditions employed here, in enamel surfaces for acid attack prevention. Studies has suggested that laser can be used to prevent enamel decalcification by altering the crystalline structure of enamel [23]. However, new experiments are still necessary to evaluate this complex mechanism.…”

Section: Resultsmentioning

confidence: 99%

Nanosecond Nd:YAG laser on dental enamel: compositional analysis by X-ray fluorescence

et al. 2005

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Non-invasive methods such as X-ray Fluorescence has been applied to study of the distinct pathologies and contamination levels analysis in various biological tissues among them nails, hair, and tooth. On the other hand, several works have demonstrated that the laser could be induced chemical and morphological alterations on the enamel surface occupying an important role as co-adjuvant in the caries disease prevention. Here, we have combined X-ray fluorescence using Fundamental Parameters method aiming to evaluate the variation in the chemical contend. The Ca and P concentrations as well as the Ca/P ratio were estimated in sound human and bovine enamel surface by X-ray fluorescence (XRF). We also evaluated the effect of the lactic and the acetic acids on the sound and irradiated bovine enamel surface by Scanning Electron Microscopy (SEM) verifying the acid attack changes in the sound and irradiated bovine enamel. The laser parameters applied produced lower ablation depths, but sufficient to induce compositional changes. Our results have indicating an alteration statically significative to Ca/P ratio and also indicated an increase in the Ca/P ratio for the irradiated groups in comparison to sound groups. We also verified that the acid attack is more pronounced to sound bovine enamel surface in relation to irradiated to the bovine enamel surface indicating that the nanosecond laser can be used to reduce the demineralization process. Ca / P ratio XRF analysis results of dental enamel surface to irradiation condition of 40 J/cm 2 (τ = 10 ns, repetition rate 5 Hz)

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Section: Resultsmentioning

confidence: 99%

Nanosecond Nd:YAG laser on dental enamel: compositional analysis by X-ray fluorescence

et al. 2005

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“…Thus selective modifications of tissue-surfaces become possible; they require high laser power and eventually the pulse time structure has to be properly adjusted (Olmes et al 1997). Both may be obtained from a FEL but not easily from other sources (Brunken et al 1999, Awazu et al 2001, Junbiao et al 2001. (b) The FEL pulse length is in the picosecond (ps) range allowing interesting investigation of dynamical processes by pump-probe techniques.…”

Section: Introductionmentioning

confidence: 99%

THz radiation from free electron lasers and its potential for cell and tissue studies

Grosse

2002

Phys. Med. Biol.

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Free electron lasers (FELs) allow the generation of electromagnetic radiation (EM) in a wide field of frequencies (respectively wavelengths) through the proper adjustment of the energy of an electron beam and the field configuration of a magnetic undulator passed by this beam. Terahertz (THz) radiation covers the region of the electromagnetic spectrum between approximately 0.3 and 30 THz and thus can be considered a continuation of the optical spectrum beyond the far infrared (IR). The very interesting results obtained from various studies of the interaction between IR radiation and biomolecules or tissue have stimulated increasing interest in the study of biological systems using THz radiation. This paper points out what role modern FELs can play in this research.

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Thermal ablation of FEL irradiation using gypsum as an indicator

et al. 2006

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Thermal effects produced in a laser-irradiated sample were studied by micro-X-ray diffraction and micro-Fourier transform infrared spectroscopy (FTIR). Gypsum, transformed into bassanite at 124 degrees C and into anhydrite at 147 degrees C, was used as a thermal indicator. Pit formation by a wavelength-tunable free electron laser (FEL) irradiation on the gypsum pellet maximized at a wavelength of 3.0 microm, 2 mJ/shot, and pits were not detected in those irradiated at 2.6 or 3.8 microm compared with the maximum at 3.0 microm and diminished at 2.0 or 4.0 microm in the human tooth case. Micro-X-ray diffraction and micro-FTIR did not reveal any appreciable bassanite or anhydrite in the irradiated regions. From the laser ablation viewpoint, these results allow the FEL ablation to be considered as plasma or evaporative ones. This study indicated that the micro-pulse of laser was effective to prevent thermal damages of laser irradiation.

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Primary experimental studies on mid-infrared FEL irradiation on dental substances at BFEL

Cited by 7 publications

References 7 publications

Nanosecond Nd:YAG laser on dental enamel: compositional analysis by X-ray fluorescence

Nanosecond Nd:YAG laser on dental enamel: compositional analysis by X-ray fluorescence

THz radiation from free electron lasers and its potential for cell and tissue studies

Thermal ablation of FEL irradiation using gypsum as an indicator

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