title: Comparison of Nd:YAG laser versus scaling and root planing in periodontal therapy.
abstract: BACKGROUND
  The Nd:YAG laser has recently been used in the treatment of periodontal disease. However, although a clinical reduction of probing depth and gingival inflammation to this new approach has been reported, it has not been fully evaluated. Interleukin-1 beta (IL- 1beta), a potent stimulator of bone resorption, has been identified in gingival crevicular fluid (GCF), which is closely associated with periodontal destruction. The aim of this study was to compare the effects of Nd:YAG laser treatment versus scaling/root planing (SRP) treatment on crevicular IL-1beta levels in 52 sampled sites obtained from 8 periodontitis patients.
  
  
  METHODS
  One or 2 periodontitis-affected sites with a 4 to 6 mm probing depth and horizontal bone loss from 3 adjacent single-root teeth in each of 4 separate quadrants were selected from patients for clinical documentation and IL-1beta assay. Sampling site(s) from each diseased quadrant was randomly assigned to one of the following groups: 1) subgingival laser treatment (20 pps, 150 mJ) only; 2) SRP only; 3) laser treatment first, followed by SRP 6 weeks later; or 4) SRP first, followed by laser therapy 6 weeks later. The GCF was collected and the amount of IL-1beta was assayed by enzyme-linked immunosorbent assay (ELISA). Clinical parameters and GCF were measured at baseline and biweekly after therapy for 12 weeks.
  
  
  RESULTS
  An obvious clinical improvement (marked decrease in the number of diseased sites with gingival index > or =2) and reduction of crevicular IL- 1beta were found in all groups. The level of IL- 1beta was significantly lower in the SRP group (P = 0.035) than in the laser therapy group for the duration of the 12 weeks. The laser combined SRP therapy group showed a further reduction of IL- 1beta (6 to 12 weeks after treatment) than either laser therapy alone or SRP combined laser therapy.
  
  
  CONCLUSIONS
  Our data suggest that laser therapy appeared to be less effective than traditional SRP treatment. Of the 4 treatment modalities, inclusion of SRP was found to have a superior IL- 1beta response, when compared to other therapies without it. In addition, no additional benefit was found when laser treatment was used secondary to traditional SRP therapy.
authors.affiliation: Department of Periodontology, School of Dentistry, College of Medicine, National Taiwan University, ROC.
authors.forename: C M
authors.initials: CM
authors.lastname: Liu
authors.forename: L T
authors.initials: LT
authors.lastname: Hou
authors.forename: M Y
authors.initials: MY
authors.lastname: Wong
authors.forename: W H
authors.initials: WH
authors.lastname: Lan
mesh_terms: D000328:Adult; D016301:Alveolar Bone Loss / Q000378:metabolism / Q000628:therapy; D000704:Analysis of Variance; D012534:Dental Scaling; D004797:Enzyme-Linked Immunosorbent Assay; D005883:Gingival Crevicular Fluid / Q000737:chemistry*; D006801:Humans; D007375:Interleukin-1 / Q000032:analysis*; D053685:Laser Therapy; D009354:Neodymium; D017063:Outcome Assessment, Health Care; D010518:Periodontitis / Q000532:radiotherapy / Q000628:therapy*; D010586:Phagocytes / Q000378:metabolism; D016745:Root Planing
chemical_list: D007375:Interleukin-1; D009354:Neodymium