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Low-level laser therapy (830 nm) on orthodontic pain: blinded randomized clinical trial

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Abstract

The objective of this research was to compare the effect single low-level laser therapy (LLLT) irradiation on pain perception in patients having fixed appliance treatment in the clinic of orthodontics. Sixty-two patients were recruited to participate in this randomized, double-blinded, placebo-controlled study. The patients were assigned to four groups: group I—laser on the right side; group II—placebo on the right side; group III—laser on the left side; group IV—placebo on the left. The laser or placebo was applied before separation, 24 and 48 h after separation of their first permanent molars in the lower arch. Just after the separation, the average of the pain for the placebo group was 1.6, significantly greater than the average of 1.1 registered for the laser group (p = 0.013). After 24 h and before the new irradiation, the values registered among the different groups did not show any differences. In relation to the gender, only after the first irradiation in placebo group, the female had a level of pain (0.1) significantly higher (p = 0.04) compared to male, and after 48 h, the group where the laser was applied had a difference (p = 0.04) among the gender with a value of lower pain for men (0.6) than for women (1.6).

The laser irradiation to minimize the pain was only effective when applied immediately after treatment and separation. In general way, there were no differences between the genders, except after the first placebo group irradiation in which the female had a significantly higher level of pain compared to male and after 48 h. The pain cycle observed in this study had its peak in 24 h, both for laser’s and placebo’s group.

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Role of funding source

This study was funded by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior).

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Authors and Affiliations

  1. Department of Orthodontics, Araraquara School of Dentistry, UNESP–Univ Estadual Paulista, Araraquara, São Paulo, Brazil

    Isabela Parsekian Martins, Renato Parsekian Martins & Ary dos Santos-Pinto

  2. Department of Dentistry, UFRN, Natal, Rio Grande do Norte, Brazil

    Sergei Godeiro Fernandes Rabelo Caldas

  3. Department of Orthodontics, Baylor College of Dentistry, Dallas, TX, USA

    Peter H. Buschang

  4. Department of Restorative Dentistry, Araraquara School of Dentistry, UNESP–Univ Estadual Paulista, Araraquara, São Paulo, Brazil

    Hermes Pretel

  5. Department of Restorative Dentistry, Araraquara School of Dentistry, São Paulo State University–UNESP, Rua Humaitá, 1680, Centro Araraquara, São Paulo, 14801-903, Brazil

    Hermes Pretel

Authors
  1. Isabela Parsekian Martins
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  2. Renato Parsekian Martins
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  3. Sergei Godeiro Fernandes Rabelo Caldas
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  4. Ary dos Santos-Pinto
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  5. Peter H. Buschang
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  6. Hermes Pretel
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Correspondence to Hermes Pretel.

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Protocol 23/10 FOAr/UNESP

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Martins, I.P., Martins, R.P., Caldas, S.G.F.R. et al. Low-level laser therapy (830 nm) on orthodontic pain: blinded randomized clinical trial. Lasers Med Sci 34, 281–286 (2019). https://doi.org/10.1007/s10103-018-2583-9

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  • DOI: https://doi.org/10.1007/s10103-018-2583-9

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