Mahmood, Tengku Lina Izzati Raja
(2013)
Histological And Morphological
Characterization Of Rat Skin After
Cw Co2 Laser Irradiation.
Masters thesis, Universiti Sains Malaysia.
Abstract
The laser-skin interaction was studied by using the Sprague Dawley rats as
experimental samples and continuous wave carbon dioxide laser (CW CO2) as a
source of irradiation. Light microscope and field emission scanning electron
microscope (FESEM) were used to evaluate the skin surface and underlying
structures for both exposed and control samples. Briefly, the rats were divided into
two groups with different setting exposures. In the first group, the rat skin was
exposed to CW CO2 laser at different power densities (15.63 W/cm2, 17.19 W/cm2,
18.75 W/cm2 and 20.31 W/cm2). Each power density was exposed in four different
exposure durations (15 s, 30 s, 45 s and 60 s). The results showed an increase on
thermal damage depth and a decrease on epidermal thickness with the increase in
both exposure duration and power density. However, the sample exposed at 20.31
W/cm2 showed different features. The damage depth was increased at 15 s and 30 s
and then the thermal damage depths were decreased at 45 s and 60 s due to the laser
ablation. These observations showed that the ablation effect strongly depended on
the exposure duration which then decreased the depth of thermal damage. In the
FESEM images, the disruption of corneocytes and the formation of the intervening
spaces between corneocytes correlated well with the increase in exposure duration
and power density. In fact, dramatic changes were noted in the skin surface, which
was treated by the laser at 20.31 W/cm2 with several deep holes that could be seen in
the FESEM image. As for the second group, the power density of 20.31 W/cm2 was
irradiated at different areas of the skin (side, chest, stomach and leg).
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