Lasers in Medical Science

, Volume 22, Issue 4, pp 245–251 | Cite as

The importance of coherence length in laser phototherapy of gingival inflammation—a pilot study

  • T. QadriEmail author
  • P. Bohdanecka
  • J. Tunér
  • L. Miranda
  • M. Altamash
  • A. Gustafsson
Original article


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.


HeNe laser Diode laser Biostimulation Low-level laser therapy 



We are grateful to Dr. Lars Hode for his invaluable support with the aspects of physics in this study.


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Copyright information

© Springer-Verlag London Limited 2007

Authors and Affiliations

  • T. Qadri
    • 1
    • 4
    Email author
  • P. Bohdanecka
    • 1
  • J. Tunér
    • 2
  • L. Miranda
    • 1
  • M. Altamash
    • 3
  • A. Gustafsson
    • 1
  1. 1.Department of Periodontology, Institute of OdontologyKarolinska InstitutetHuddingeSweden
  2. 2.Private Dental ClinicGrängesbergSweden
  3. 3.Altamash Institute for Dental MedicineKarachiPakistan
  4. 4.EnköpingSweden

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