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Wound healing efficacy of a 660-nm diode laser in a rat incisional wound model

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Abstract

This study aimed to elucidate the optimum usage parameters of low reactive-level laser therapy (LLLT) in a rat incisional wound model. In Sprague-Dawley rats, surgical wounds of 15-mm length were made in the dorsal thoracic region. They were divided into groups to receive 660-nm diode laser irradiation 24 h after surgery at an energy density of 0 (control), 1, 5, or 10 J/cm2. Tissue sections collected on postoperative day 3 were stained with hematoxylin-eosin and an antibody for ED1 to determine the number of macrophages around the wound. Samples collected on day 7 were stained with hematoxylin-eosin and observed via polarized light microscopy to measure the area occupied by collagen fibers around the wound; day 7 skin specimens were also subjected to mechanical testing to evaluate tensile strength. On postoperative day 3, the numbers of macrophages around the wound were significantly lower in the groups receiving 1 and 5 J/cm2 irradiation, compared to the control and 10 J/cm2 irradiation groups (p < 0.01). The area occupied by collagen fibers in day 7 was largest in 5 J/cm2 group, followed by 1 J/cm2 group, although this difference was not significant. The day 7 tensile test demonstrated significantly greater rupture strength in healing tissues from 1 and 5 J/cm2 irradiation groups, compared to the control group (p < 0.05). Thus, LLLT with a 660-nm diode laser with energy density of 1 and 5 J/cm2 enhanced wound healing in a rat incisional wound model. However, a higher radiation energy density yielded no significant enhancement.

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None of the authors have received direct or indirect benefits as a result of this work.

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Authors and Affiliations

  1. Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo, 101-0062, Japan

    Ryoichi Suzuki & Kazuo Takakuda

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  1. Ryoichi Suzuki
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  2. Kazuo Takakuda
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Correspondence to Kazuo Takakuda.

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Suzuki, R., Takakuda, K. Wound healing efficacy of a 660-nm diode laser in a rat incisional wound model. Lasers Med Sci 31, 1683–1689 (2016). https://doi.org/10.1007/s10103-016-2038-0

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  • DOI: https://doi.org/10.1007/s10103-016-2038-0

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