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Effect of smoking on the gingival capillary density: assessment of gingival capillary density with orthogonal polarization spectral imaging (2005)

Lindeboom, J. A. ; Mathura, K. R. ; Harkisoen, S. ; [et al.]

Oxford, UK : Munksgaard International Publishers

Journal of clinical periodontology 32 (2005), S. 0

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ISSN: 1600-051X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Objectives: Microvascular changes because of smoking are frequently presumed in models because of the negative effect of smoking portrayed on the microcirculation. We hypothesized that cigarette smoke might lead to a decrease in gingival capillary density.Materials and Methods: Capillary density was assessed with orthogonal polarization spectral (OPS) imaging, a technique using special optics by which a virtual light source is created at a depth of 1 mm within the mucosa. The light is absorbed by haemoglobin, resulting in an image of the capillaries in negative contrast. The gingival capillary density was measured in 20 healthy male dental students with a mean age of 25. Ten of the students were smokers and 10 were non-smokers. In each subject six images of the right maxillary pre-molar region were obtained, and the mean gingival capillary density was determined through the use of K&K software technology.Results: The mean capillary density in smokers was 69.3±8.9 capillaries per visual field compared with a mean capillary density in non-smokers of 60.6±5.4 (p=0.33).Conclusion: No significant differences were found between the gingival capillary density of smokers and non-smokers.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1600-051X.2005.00854.x

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Laserlithotripsy of salivary stones: A comparison between the pulsed dye laser and the Ho-YSGG laser (1990)

Sterenborg, H. J. C. M. ; Akker, H. P. ; Meulen, F. W. ; [et al.]

Springer

Lasers in medical science 5 (1990), S. 357-363

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ISSN: 1435-604X

Keywords: Laser lithotripsy ; Salivary calculi ; Pulsed 504 dye laser ; Ho-YSGG laser ; Ablation

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine , Physics , Technology

Notes: Abstract The feasibility of laser lithotripsy of salivary stones was investigated. Two types of laser systems were evaluated: a 504 nm flashlamp pumped dye laser and a Ho-YSGG laser. With the dye laser, plasma flashes and acoustic phenomena could be observed. The number of laser shots per unit mass necessary to fragment the stone decreased in proportion to the energy per laser pulse to the power −2.7. With the Ho-YSGG laser, a more ablative kind of stone decomposition was observed. Here the number of shots per unit mass necessary for fragmentation was inversely proportional to the energy per laser pulse. For both lasers the total time necessary to fragment the stones is much too long to compete with conventional stone removal.