Comment on “Clinical study on the efficacy of LED phototherapy for pain control in an orthodontic procedure”

  • Rodrigo Duarte Farias
Letter to the Editor

I read “Clinical study on the efficacy of LED phototherapy for pain control in an orthodontic procedure.” Figueira, I.Z, Souza, A.P.C., Machado, A.W. et al. Lasers Med Sci (2019) 34: 479–485.

Congratulations on the publication of your article. Similar studies used split-mouth design [1, 2, 3]. Split-mouth design is used to avoid interindividual biological variation in pain perception [2, 4]. Moreover, use of this design associated with masking of the participants may have reduced the Hawthorne effect [5].

Why was a study in a different design carried out?

Thank you for publishing this interesting paper.


Compliance with ethical standards

Conflict of interest

The author declares that there is no conflict of interest.


  1. 1.
    Farias RD, Closs LQ, Jr SAQM (2016) Evaluation of the use of low-level laser therapy in pain control in orthodontic patients: a randomized split-mouth clinical trial. Angle Orthod 86(2):193–198CrossRefGoogle Scholar
  2. 2.
    Doshi-Mehta G, Bhad-Patil WA (2012) Efficacy of low-intensity laser therapy in reducing treatment time and orthodontic pain: a clinical investigation. Am J Orthod Dentofac Orthop 141:289–297CrossRefGoogle Scholar
  3. 3.
    Martins IP, Martins RP, Caldas SGFR et al (2019) Low-level laser therapy (830 nm) on orthodontic pain: blinded randomized clinical trial. Lasers Med Sci 34:281CrossRefPubMedGoogle Scholar
  4. 4.
    Shirani AM, Gutknecht N, Taghizadeh M, Mir M (2009) Low-level laser therapy and myofacial pain dysfunction syndrome: a randomized controlled clinical trial. Lasers Med Sci 24:715–720CrossRefPubMedGoogle Scholar
  5. 5.
    Li FJ, Zhang JY, Zeng XT, Guo Y (2015) Low-level laser therapy for orthodontic pain: a systematic review. Lasers Med Sci 30(6):1789–1803CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Universidade Federal de Santa CatarinaFlorianópolisBrazil
  2. 2.São JoséBrazil

Personalised recommendations