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Erschienen in: Lasers in Medical Science 6/2022

13.06.2022 | Original Article

Effects of high-frequency near infrared laser irradiation on experimental tooth movement–induced pain in rats

verfasst von: Ayaka Nakatani, Ryo Kunimatsu, Yuji Tsuka, Shuzo Sakata, Kayo Horie, Hidemi Gunji, Shota Ito, Isamu Kado, Nurul Aisyah Rizky Putranti, Ryuji Terayama, Kotaro Tanimoto

Erschienen in: Lasers in Medical Science | Ausgabe 6/2022

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Abstract

Discomfort and dull pain are known side effects of orthodontic treatment. Pain is expected to be reduced by near-infrared (NIR) lasers; however, the mechanism underlying effects of short-pulse NIR lasers in the oral and maxillofacial area remains unclear. This study aimed to examine the effects of high-frequency NIR diode laser irradiation on pain during experimental tooth movement (ETM) on 120 J. NIR laser with 910 nm wavelength, 45 W maximum output power, 300 mW average output power, and 200 ns pulse width (Lumix 2; (Lumix 2; Fisioline, Verduno CN, Italy) was used for the experiment. A nickel–titanium-closed coil was used to apply a 50-gf force between the maxillary left-side first molar and incisor in 7-week-old Sprague–Dawley rats (280–300 g) to induce ETM. We measured facial-grooming frequency and vacuous chewing movement (VCM) period between laser-irradiation and ETM groups. We performed immunofluorescent histochemistry analysis to quantify levels of Iba-1, astrocytes, and c-fos protein-like immunoreactivity (Fos-IR) in the trigeminal spinal nucleus caudalis (Vc). Compared with the ETM group, the laser irradiation group had significantly decreased facial-grooming frequency (P = 0.0036), VCM period (P = 0.043), Fos-IR (P = 0.0028), Iba-1 levels (P = 0.0069), and glial fibrillary acidic protein (GFAP) levels (P = 0.0071). High-frequency NIR diode laser irradiation appears to have significant analgesic effects on ETM-induced pain, which involve inhibiting neuronal activity, microglia, and astrocytes, and it inhibits c-fos, Iba-1, and GFAP expression, reducing ETM-induced pain in rats. High-frequency NIR diode laser application could be applied to reduce pain during orthodontic tooth movement.
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Metadaten
Titel
Effects of high-frequency near infrared laser irradiation on experimental tooth movement–induced pain in rats
verfasst von
Ayaka Nakatani
Ryo Kunimatsu
Yuji Tsuka
Shuzo Sakata
Kayo Horie
Hidemi Gunji
Shota Ito
Isamu Kado
Nurul Aisyah Rizky Putranti
Ryuji Terayama
Kotaro Tanimoto
Publikationsdatum
13.06.2022
Verlag
Springer London
Erschienen in
Lasers in Medical Science / Ausgabe 6/2022
Print ISSN: 0268-8921
Elektronische ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-022-03543-x

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