title: Laser-aided circumferential supracrestal fiberotomy and low-level laser therapy effects on relapse of rotated teeth in beagles.
abstract: OBJECTIVE
  To investigate the effectiveness and periodontal side effects of laser circumferential supracrestal fiberotomy (CSF) and low-level laser therapy (LLLT) on orthodontically rotated teeth in beagles.
  
  
  METHODS
  Eighteen mandibular incisors from nine dogs were divided into three groups by treatment (n = 6/group): A, orthodontic couple force application only (control); B, laser CSF following orthodontic couple force application; and C, LLLT following orthodontic couple force application. Both mandibular lateral incisors were rotated for 4 weeks, and the relapse tendency was observed for 4 weeks more without any retainers. The amount of relapse, sulcus depth, and gingival recession were measured at weeks 4 and 8. One-way analysis of variance (ANOVA) and Scheffé's post hoc test were used for data analysis. Tissue specimens were examined at week 8 under light microscopy after hematoxylin-eosin (H&E) and Masson's trichrome staining.
  
  
  RESULTS
  The mean percentage of relapse was 41.29% in group A, 14.52% in group B, and 56.80% in group C (P < .001). Four weeks after laser CSF, the sulcus depth increased by 0.67 mm, but no gingival recession was observed. There was no significant difference between groups A and C in terms of sulcus depth and gingival recession.
  
  
  CONCLUSIONS
  Laser CSF is an effective procedure to decrease relapse after tooth rotation, causing no apparent damage to the supporting periodontal structures, whereas LLLT on orthodontically rotated teeth without retainers appears to increase the relapse tendency.
authors.affiliation: Department of Orthodontics, Oral Biology Research Institute, College of Dentistry, Kyung-Hee University, Seoul, Korea.
authors.forename: Su-Jung
authors.initials: SJ
authors.lastname: Kim
authors.forename: Joo-Hee
authors.initials: JH
authors.lastname: Paek
authors.forename: Ki-Ho
authors.initials: KH
authors.lastname: Park
authors.forename: Seung-Goo
authors.initials: SG
authors.lastname: Kang
authors.forename: Young-Guk
authors.initials: YG
authors.lastname: Park
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D003799:Dental Stress Analysis; D004285:Dogs; D005889:Gingival Recession / Q000209:etiology; D005890:Gingivectomy / Q000379:methods*; D053685:Laser Therapy; D054023:Lasers, Semiconductor / Q000627:therapeutic use; D028022:Low-Level Light Therapy / Q000009:adverse effects*; D008297:Male; D012399:Rotation; D055502:Secondary Prevention; D018709:Statistics, Nonparametric; D014087:Tooth Movement Techniques