Background: Hirsutism and hypertrichosis are common problems. Laser-assisted hair removal has recently become a popular method to remove unwanted hair. However, histologic changes of the hair follicle after exposure to laser continue to require further investigation.
Objective: To determine the thermal effect of a millisecond Nd:YAG hair removal laser.
Methods: Six patients with black hair were treated with 50 msec pulsed Nd:YAG laser at fluences 30, 50 or 100 J/cm(2). Histologic examinations were performed on each laser-treated site at 24-72 hours after laser exposure.
Results: Fluence-dependent selective thermal injury to follicles was seen. The average depth of acute laser injury at fluences 30, 50 and 100 J/cm(2) were 1.06, 0.85 and 1.11 millimeters, respectively.
Conclusions: Long-pulsed millisecond Nd:YAG lasers produce selective thermal damage of hair follicles. Varied laser fluences used in this study did not statistically alter the degree of thermal injury.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/lsm.1033 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
We report a new type of photoconductive semiconductor switch (PCSS), consisting of a semi-insulating gallium arsenic (GaAs) substrate and a front-bonded ruby crystal. The 532 nm laser pulses from an Nd-YAG laser incident on the front surface of the ruby crystal. A portion of the laser pulse passes through the crystal and reaches the GaAs substrate, and the remaining portion of the laser pulse is absorbed by the ruby crystal.
View Article and Find Full Text PDFTreatment of port-wine stains: analysis.
Med Instrum
August 1987
Department of Clinical Physics, St. Joseph Hospital, Eindhoven, The Netherlands.
Port-wine stains (PWS) are bluish red skin stains that are caused by enlarged, ectatic blood vessels in the dermis. Laser treatment of PWS is analyzed from computation of the spatial distribution of heat production by direct absorption of the laser light and subsequent heat conduction. The absorption and scattering caused by oxyhemoglobin, epidermis, and dermis as a function of wavelength are utilized in this analysis.
View Article and Find Full Text PDFHigh speed colour cinematography at 400 frames per second was used to photograph both single and train burst Nd/YAG laser applications in ox eyes at threshold energy levels. Measurements of the extent and speed of particle scatter and tissue distortion from the acoustic transient were made from a sequential freeze frame analysis of the films. Particles were observed to travel over 8 mm from the site of Nd/YAG application 20 milliseconds after a single pulse at initial speeds in excess of 20 km/h.
View Article and Find Full Text PDF[Effect of neodymium YAG laser treatment of glaucoma on endothelial cell density of the cornea].
Klin Monbl Augenheilkd
April 1986
In a prospective clinical study corneal endothelium cell density was measured by means of contact specular microscopy prior to and 2, 4 and 12 weeks after Nd-YAG laser treatment. Two different laser techniques were applied: 19 eyes with narrow-angle glaucoma were treated by laser iridotomy, 21 eyes with open-angle glaucoma underwent laser treatment of the trabecular meshwork. The Nd-YAG laser was driven in Q-switched mode (nanosecond range) for iridotomy and in free-running mode (millisecond range) to treat the trabecular meshwork.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!