1992
DOI: 10.1055/s-2007-1020166 View full text |Buy / Rent full text
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Abstract: The tracheal tissue of a rat was heterotopically transplanted beneath the abdominal skin of a syngenetic rat, and the transplanted graft was irradiated with a He-Ne laser (2.41 J/cm2). Four or seven days following transplantation, Chinese ink staining was used to ascertain the number of newly generated vessels. Rats sacrificed on day 4 were divided into 3 groups, according to the number of laser irradiation treatments: A0, A2, and A4. Similarly, rats sacrificed on day 7 were divided into groups B0, B2, and B4.… Show more

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“…Squares, group 1, x-ray-irradiated control; triangles, group 2, x-ray-irradiated + LILT at 4 J/cm 2 . ported to stimulate the proliferative phase of wound healing [3,10,31,43]; other authors have reported stimulatory effects in the inflammatory phase [13]. One proposed mechanism by which LILT stimulates the wound-healing process is by the absorption of light energy by the mitochondria, which increases cell energy and stimulates the release of chemical mediators [3,25,44].…”
Section: Discussionmentioning
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“…Squares, group 1, x-ray-irradiated control; triangles, group 2, x-ray-irradiated + LILT at 4 J/cm 2 . ported to stimulate the proliferative phase of wound healing [3,10,31,43]; other authors have reported stimulatory effects in the inflammatory phase [13]. One proposed mechanism by which LILT stimulates the wound-healing process is by the absorption of light energy by the mitochondria, which increases cell energy and stimulates the release of chemical mediators [3,25,44].…”
Section: Discussionmentioning
“…It is thought that such effects occur due to the enhancement of cell metabolic processes as a result of laser therapy, thereby affecting the electrophysiological properties of the tissue [12]. Laser irradiation has been shown to affect most of the cell types involved in wound healing: in two recent studies, laser irradiation was reported to activate fibroblasts [13,14]. Young and Dyson [15] also reported that laser therapy stimulated macrophages and, therefore, is effective during the inflammatory stage of repair; the authors concluded that laser irradiation stimulates macrophages to release chemical mediators, cytokines, and growth factors, which in turn activate the latter stages of wound repair.…”
Section: Introductionmentioning
“…The most convincing evidence to elucidate the possible mechanisms of effects of light irradiation at 630-660 nm and its clinical benefits has been obtained from laboratory studies on various animal models and tissue cultures. At the cellular level, the biostimulatory effects of light have been demonstrated on fibroblast proliferation [11][12][13], neovascularization [14], collagen synthesis [12], and the mitochondrial electron transport system [15]. These in vitro studies demonstrated the positive biostimulatory effects of radiation at 660 nm on cell lines and are of value in determining the potential mechanisms of action of light irradiation in vivo.…”
Section: Introductionmentioning
“…O emprego de LEDs e/ou LASERs de baixa potência com finalidades terapêuticas vem sendo muito ampliado ao longo dos últimos anos com farta literatura disponível em sites e em diversas revistas científicas. A foto estimulação causada pela irradiação por LEDs ou LASERs de baixa potência apresenta uma série de resultados tais como, entre outros, o aumento da taxa de proliferação de células (KARU, 1987), o aumento da taxa de produção de fibroblastos e da síntese de colágenos (TAKAHASHI et al, 1992;VINCK et al, 2003), aumento da taxa de síntese de RNA e DNA (KARU, 1987;KARU;KOLYAKOV, 2005), síntese de ATP , aumento da vascularização (CONLAN; RAPLEY; COBB, 1996), variações na condução nervosa (VINCK et al, 2005).…”
Section: Introductionunclassified