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The purpose of this study was to analyze the effect of the Fukushima Daiichi Nuclear Power Plant (FNPP) accident on the incremental line formation of cementum in the teeth of Japanese macaques. Radioactive cesium-137 (137Cs) concentration in the body was determined by γ-ray spectrum analysis of the femoral muscle using a germanium semiconductor detector. Tooth samples were fixed in 10% formalin solution, decalcified, sectioned at 4 μm thickness, and stained with hematoxylin and eosin (HE). Cementum incremental lines were observed under a light microscope and analyzed using the image analysis software WinROOF 2018. The age distribution of macaques was 2–25 years, as determined from the analysis of cementum incremental lines. In juveniles, the incremental lines of the affected group by the accident were unclear compared to those of the unaffected control group. In adults exposed to high concentrations of 137Cs, the incremental lines were locally irregularly spaced and obscured. The tissue structure was disturbed by a mixture of cellular and acellular cementum. It is suggested that radiation exposure may affect the formation of incremental lines by cementoblasts.

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Analysis of Cementum Incremental Line Formation in the Teeth of Japanese Macaques Affected by the Fukushima Daiichi Nuclear Power Plant Accident

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  • 发表日期：

    2026年

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  • Hiroyuki Mishima,
  • Masatoshi Suzuki,
  • Hisashi Shinoda,
  • Tohru Hayakawa,
  • Manabu Fukumoto

摘要

The purpose of this study was to analyze the effect of the Fukushima Daiichi Nuclear Power Plant (FNPP) accident on the incremental line formation of cementum in the teeth of Japanese macaques. Radioactive cesium-137 (137Cs) concentration in the body was determined by γ-ray spectrum analysis of the femoral muscle using a germanium semiconductor detector. Tooth samples were fixed in 10% formalin solution, decalcified, sectioned at 4 μm thickness, and stained with hematoxylin and eosin (HE). Cementum incremental lines were observed under a light microscope and analyzed using the image analysis software WinROOF 2018. The age distribution of macaques was 2–25 years, as determined from the analysis of cementum incremental lines. In juveniles, the incremental lines of the affected group by the accident were unclear compared to those of the unaffected control group. In adults exposed to high concentrations of 137Cs, the incremental lines were locally irregularly spaced and obscured. The tissue structure was disturbed by a mixture of cellular and acellular cementum. It is suggested that radiation exposure may affect the formation of incremental lines by cementoblasts.