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Erschienen in: Lasers in Medical Science 1/2017

29.10.2016 | Original Article

Three consecutive days of application of LED therapy is necessary to inhibit experimentally induced root resorption in rats: a microtomographic study

verfasst von: Dayla Thyeme Higashi, Avacir Casanova Andrello, Pedro Marcelo Tondelli, Dari de Oliveira Toginho Filho, Solange de Paula Ramos

Erschienen in: Lasers in Medical Science | Ausgabe 1/2017

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Abstract

Previous studies have suggested that phototherapy may modulate orthodontic tooth movement and the incidence of root resorption. We aimed to identify a minimal dose-response relationship to LED therapy with regard to orthodontic tooth movement (OTM) and root resorption in rats. Forty-eight male Wistar rats were divided into six groups with equal and random distribution: control (C) no intervention; three daily LED irradiation (CLED); submitted only to OTM (RR); OTM and LED irradiation on the first day (LED1); OTM and two LED irradiation on the first and second days (LED2); and OTM and three LED irradiation on the first, second, and third days (LED3). Orthodontic appliance was installed in groups RR, LED1, LED2, and LED3 to promote OTM. Animals from groups CLED, LED1, LED2, and LED3 received LED therapy (940 nm, 4 J, 4 J/cm2) according to each group of treatment. After 7 days, all the animals were sacrificed. The jaws were fixed and scanned with microtomography (micro-CT). The micro-CT images were reconstructed on 2D and 3D models. These models were used to identify and measure root resorption number and dimensions (diameter, depth, and volume). The distance between the first and second molars was used to verify tooth displacement. The results showed that LED3 group had significantly lower number of root resorption. The root resorption dimensions (diameter and depth) had no significant differences among the experimental groups. LED3 group had significant tooth displacement in relation to C and CLED groups. In conclusion, three daily LED therapy doses are required to inhibit root resorption after appliance of orthodontic forces.
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Metadaten
Titel
Three consecutive days of application of LED therapy is necessary to inhibit experimentally induced root resorption in rats: a microtomographic study
verfasst von
Dayla Thyeme Higashi
Avacir Casanova Andrello
Pedro Marcelo Tondelli
Dari de Oliveira Toginho Filho
Solange de Paula Ramos
Publikationsdatum
29.10.2016
Verlag
Springer London
Erschienen in
Lasers in Medical Science / Ausgabe 1/2017
Print ISSN: 0268-8921
Elektronische ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-016-2100-y

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