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  • 1
    Electronic Resource
    Electronic Resource
    Effect of XeCl-308nm excimer laser on the mineral content of human dentin (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 13 (1997), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The effect of the XeCl-308nm excimer laser on the mineral content and surface morphology of cut dentin was examined in ten extracted human teeth. Each dentin specimen was lased for 4 s at a fluence of 1 J/cm2 and frequency of 25 Hz. Non-lased area of the same specimen served as control. Scanning electron microscopy and energy dispersive spectrometry revealed a significant decreases in the phosphorus levels following laser treatment. A decrease in calcium levels also occurred but was not statistically significant. Nonsignificant changes in sulphur and potassium levels were also noted. Morphologically, the lased dentin showed an apparently melted surface with partial obstruction of the dentin tubules as well as cracks along the lased surface. Therefore, it appeared that laser treatment may alter the chemical structure as well as the surface morphology of the dentin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1997.tb00046.x
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  • 2
    Electronic Resource
    Electronic Resource
    Efficacy of XeCl-308 excimer laser in fusing hydroxyapatite to seal the root apex (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 11 (1995), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Sealing the root apex during apical surgery is important for a successful outcome. The effect of XeCl-308 nm excimer laser irradiation on the fusion and seal of hydroxyapatite to the root apex was tested in extracted human teeth. Twenty-four roots of intact single-rooted premolars were instrumented to size 30 K-file at the apex leaving a patent apical foramen. The apex of each tooth was covered with a freshly prepared paste of hydroxyapatite powder mixed with saline. The samples were then divided into two groups. In 12 teeth, the apical area was irridiated with XeCl-308 nm excimer laser at a fluence of 0.7 J/cm2 for 5 s with pulse repetition rate of 25 Hz and a spot size of 0.13 cm2 immediately after the hydroxyapatite application. In the other 12 teeth, no laser treatment was performed after the hydroxyapatite application. The roots were mounted on a model for the detection of radicular leakage of hydrogen peroxide. The hydrogen peroxide leakage of each sample was measured and the difference between the test groups compared. The ability of the hydroxyapatite plug to prevent hydrogen peroxide leakage at the apex was also tested by applying compressed air from the triple syringe on the coronal access preparation for 2 min. Apical leakage was found in four teeth in the lased group and in eight teeth in the non-plased group. However, the difference between the groups was not statistically significant.Compressed air applied to the coronal access caused hydrogen peroxide leakage in all the teeth. Under the conditions of this study, the laser treatment did not seem to significantly improve the ability of the irradiated hydroxyapatite plug to seal the root apex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1995.tb00481.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Lasers for gamete micromanipulation: Basic concepts (1993)
    Springer
    Journal of assisted reproduction and genetics 10 (1993), S. 121-125 
    Details
    ISSN: 1573-7330
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01207733
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Laser (1992)
    Springer
    Journal of assisted reproduction and genetics 9 (1992), S. 303-305 
    Details
    ISSN: 1573-7330
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203948
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Assisted hatching in mouse embryos using a noncontact Ho:YSGG laser system (1995)
    Springer
    Journal of assisted reproduction and genetics 12 (1995), S. 288-293 
    Details
    ISSN: 1573-7330
    Keywords: micromanipulation ; laser ; zona pellucida ; assisted hatching ; embryos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose A noncontact holmium:yttrium scandium gallium garnet (Ho:YSGG) laser system has been designed and tested for the micromanipulation of mammalian embryos. The purpose of this preliminary investigation was to determine the effectiveness of this laser for assisted hatching and evaluate its impact on embryo viability. The Ho:YSGG system, utilizing 250-μsec pulses at a wave-length of 2.1 μm and 4 Hz, was used to remove a portion of the zona pellucida (ZP) of two-to four-cell FVB mouse embryos. Results In the first experiment there was no difference in blastocyst production or hatching rates following laser or conventional assisted hatching (LAH or AH, respectively) in contrast to control embryos cultured in a 5% CO2 humidified air incubator at 37°C. In the second experiment a blastocyst antihatching culture model was employed and LAH-treated embryos were cultured in a serum-free HTF medium (HTF-o). Blastocyst formation was not influenced by LAH treatment and hatching was increased (P 〈 0.01) from 4 to 60% compared to HTF-o control group. Conclusions These preliminary data demonstrate the utility and nontoxic properties of the Ho:YSGG laser system for quick and precise ZP drilling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02212934
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of Acoustic Transients During Pulsed Holmium:YAG Laser Ablation of Cadaveric Human Temporal Bone (2000)
    Springer
    Lasers in medical science 15 (2000), S. 2-5 
    Details
    ISSN: 1435-604X
    Keywords: Keywords:Ear; Holmium:YAG laser; Laser tissue effects; Photoacoustic injury; Stapedotomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics , Technology
    Notes: Abstract. Pulsed infrared (IR) and ultraviolet (UV) lasers have been suggested for use in middle ear surgery due to potential fiberoptic delivery, decreased thermal trauma and precise ablation characteristics. Although attention has been focused on the thermal and photoacoustic events that occur during pulsed laser ablation of hard tissue, there are few studies which evaluate the acoustic energy generated from these devices from an audiological standpoint. In this study, the mastoid cavities of cadaveric human temporal bones were irradiated with a holmium: yttrium aluminium garnet (Ho:YAG) laser (λ=2.12 µm) using the following parameters: 5, 10, and 15 Hz pulse repetition rate and 1, 2, 4, 6, 8, and 10 W average power. During ablation, acoustic measurements were made using a sound level meter positioned 5 cm away from the target site. With each set of laser parameters, the sound intensity exceeded 85 dB (dBA scale). Peak intensities of 125 dB were measured, and a saturation effect noted above 4 W or 500 mJ/pulse. The clinical significance of these findings is discussed and the acoustical aspects of middle ear function and noise trauma are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101030050040
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    Paper (German National Licenses)
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