title: The importance of coherence length in laser phototherapy of gingival inflammation: a pilot study.
abstract: The aim of this study was to investigate if coherence length is of importance in laser phototherapy. Twenty patients with moderate periodontitis were selected. After oral hygiene instructions, scaling and root planing (SRP), one side of the upper jaw was randomly selected for HeNe (632.8 nm, 3 mW) or InGaAlP (650 nm, 3 mW) laser irradiation. One week after SRP, the following parameters were measured: pocket depth, gingival index, plaque index, gingival crevicular fluid volume, matrix metalloproteinase (MMP-8), interleukin (IL-8) and subgingival microflora. The irradiation (180 s per point, energy 0.54 J) was then performed once a week for 6 weeks. At the follow up examination, all clinical parameters had improved significantly in both groups. A more pronounced decrease of clinical inflammation was observed after HeNe treatment. MMP-8 levels were considerably reduced on the HeNe side, while there was no difference for IL-8 or microflora. Coherence length appears to be an important factor in laser phototherapy.
authors.affiliation: Department of Periodontology, Institute of Odontology, Karolinska Institutet, Huddinge, Sweden. talat.qadri@mbox.lidnet.se
authors.forename: T
authors.initials: T
authors.lastname: Qadri
authors.forename: P
authors.initials: P
authors.lastname: Bohdanecka
authors.forename: J
authors.initials: J
authors.lastname: Tunér
authors.forename: L
authors.initials: L
authors.lastname: Miranda
authors.forename: M
authors.initials: M
authors.lastname: Altamash
authors.forename: A
authors.initials: A
authors.lastname: Gustafsson
mesh_terms: D000328:Adult; D005260:Female; D005881:Gingiva / Q000473:pathology*; D005891:Gingivitis / Q000628:therapy*; D006305:Health Status Indicators; D006801:Humans; D007249:Inflammation / Q000628:therapy*; D016209:Interleukin-8; D054020:Lasers, Gas; D028022:Low-Level Light Therapy; D008297:Male; D020784:Matrix Metalloproteinase 8; D008875:Middle Aged; D010518:Periodontitis / Q000628:therapy; D010789:Phototherapy / Q000295:instrumentation / Q000379:methods; D010865:Pilot Projects; D011446:Prospective Studies
chemical_list: D016209:Interleukin-8; D020784:Matrix Metalloproteinase 8