title: Comparing the effectiveness of Q-switched Ruby laser treatment with that of Q-switched Nd:YAG laser for oculodermal melanosis (Nevus of Ota).
abstract: OBJECTIVE
  The objective of this study was to compare the efficacy and safety of Q-switched Ruby laser versus Q-switched neodymium:yttrium-aluminium-garnet (Nd:YAG) laser for oculodermal melanosis (Nevus of Ota) birthmarks in a large group of patients.
  
  
  METHODS
  A retrospective review was conducted of 94 patients with Nevus of Ota treated with a Q-switched Ruby laser and a Q-switched Nd:YAG laser over a 3-year period. The subjects' ages ranged from 3 to 64 years; there were 70 females and 24 males, all of whom were of Asian descent. The number of treatments ranged from 1 to 8. Duration of treatment ranged from 6 months to 3 years and 10 months, with a mean of 14 months. Patients (n=47) received Q-switched Ruby laser treatment (694 nm) using light dosages of 7-10 J cm(-2). Subsequent patients (n=47) received Q-switched Nd:YAG laser treatment (1064 nm) using light dosages of 7-10 J cm(-2). The primary efficacy measurement was the quantitative assessment of clearing and fading response using the DermaSpectrometer for the Q-switched Ruby laser group versus the Q-switched Nd:YAG laser group.
  
  
  RESULTS
  Based on a paired t-test, clinical and statistically significant differences in clearing and fading response were observed amongst the Q-switched Ruby laser-treated subjects as preferred to the appearance of Q-switched Nd:YAG laser-treated group (P<0.05). In both groups, transient hyperpigmentation resolved in all subjects within 6 months. Permanent hyperpigmentation or scarring was not observed in either group.
  
  
  CONCLUSIONS
  Use of a Q-switched Ruby laser resulted in better clearing and fading as compared with Q-switched Nd:YAG laser.
authors.affiliation: Department of Plastic Surgery, Chang Gung Memorial Hospital, Chang Gung University, 199 Tung Hwa North Road, Taipei, Taiwan. chengjen@adm.cgmh.com.tw
authors.forename: Cheng-Jen
authors.initials: CJ
authors.lastname: Chang
authors.forename: Ching-Song
authors.initials: CS
authors.lastname: Kou
mesh_terms: D000293:Adolescent; D000328:Adult; D000535:Aluminum; D044466:Asian People; D002648:Child; D002675:Child, Preschool; D005153:Facial Neoplasms / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D053685:Laser Therapy / Q000295:instrumentation*; D007834:Lasers; D008297:Male; D008875:Middle Aged; D009354:Neodymium; D009507:Nevus of Ota / Q000532:radiotherapy*; D012189:Retrospective Studies; D013624:Taiwan; D016896:Treatment Outcome; D015019:Yttrium
chemical_list: C503779:yttrium-aluminum-garnet; D009354:Neodymium; D015019:Yttrium; D000535:Aluminum