Hh. Chan et al., An in vivo study comparing the efficacy and complications of diode laser and long-pulsed Nd : YAG laser in hair removal in Chinese patients, DERM SURG, 27(11), 2001, pp. 950-954
Background. Lasers with long wavelengths are less well absorbed by melanin
and are considered to be particularly suitable for hair removal in dark-ski
nned patients.
Objective. To compare the efficacy and complications of 800 nm diode and lo
ng-pulsed 1064 nm Nd:YAG lasers in laser-assisted hair removal in Chinese p
atients.
Methods. Fifteen women had hair removal treatments (13 axillae and 2 legs)
with diode laser on one side and Nd:YAG laser on the other. They were follo
wed up for 36 weeks. Subjective assessments included the degree of immediat
e pain and the degree of hair regrowth. Clinical photographs were taken for
evaluation by two independent observers to assess complications and the de
gree of hair regrowth.
Results. Long-pulsed Nd:YAG laser was found to be significantly associated
with a greater degree of immediate pain after laser surgery (P=.0001, indep
endent sample t-test) and also had a longer laser time (P=.0001, independen
t sample t-test). Besides transit adverse effects such as erythema and peri
follicular edema, only one patient developed hypopigmentation at week 6 whi
ch resolved by week 36. Although regrowth rates were low at week 6 (subject
ive rates were 23% and 19% for Nd:YAG and diode laser, respectively), most
patients had significant regrowth at week 36 (subjective regrowth rate 91%
for both long-pulsed Nd:YAG and diode lasers).
Conclusion. Diode 800 nm and Nd:YAG 1064 nm lasers are safe in laser-assist
ed hair removal in Chinese patients, and besides immediate pain, there was
no other significant adverse effect. Most patients experienced regrowth 36
weeks after a single treatment. Further study is necessary to determine the
longterm clinical efficacy and complications of laser-assisted hair remova
l with these systems in dark-skinned patients.