Maxillofacial Deformity and Change in the Histochemical Characteristics of the Masseter Muscle after Unilateral Sectioning of the Facial Nerve in Growing Rabbits

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概要

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• Maxillofacial growth and histochemical effects of long-term unilateral chewing caused by unilateral facial paralysis on the masseter muscle were studied in growing rabbits. The sample for this study consisted of a total of 20 young male Polish rabbits. The experimental group was comprised of 15 rabbits, which were subjected to dissection of the right facial nerve on the 21st day after birth, while the remaining 5 animals served as a control. The duration of the experimental period was 6 months. In the experimental group, the rabbits with facial abnormality on the paralyzed right side performed unilateral chewing only on the surgically unmanipulated side. Morphometric analysis showed facial asymmetry, with the maxillofacial region severely atrophied on the side that had undergone surgery. Both 4 weeks and 6 months after the operation, type 1 fibers of the masseter muscle on the denervated side, i.e., the non-chewing side, were significantly fewer in number and smaller than those on the unmanipulated side. However, type 2 fibers did not differ in size between sides. NADH-tetrazolium-reductase (NADH-TR) of the masseter was less reactive on the denervated side, reflecting a lower oxidative capacity. These results indicate that the alteration of the functional activities contributed to selective disuse atrophy of the type 1 fibers and a conversion from type 1 to type 2A fibers on the non-chewing side. In other words, the larger diameter and greater proportion of type 1 fibers of the masseter was indicative of work hypertrophy on the unmanipulated, chewing side. This study reveals that facial nerve dissection changes the maxillofacial growth and the histochemical features of the portion of the masseter muscle innervated by the trigeminal nerve, but not by the facial nerve.

• 日本組織細胞化学会の論文

著者

• HASHIMOTO Kenji

  Department of Oral and Maxillofacial Surgery, Hamamatsu University School of Medicine

• Kitagawa Yoshimasa

  福井医科大学 歯口外

• Kitagawa Yoshimasa

  Department Of Dentistry And Oral Surgery Fukui Medical University

• SANO Kazuo

  Department of Dentistry and Oral Surgery, School of Medicine, University of Fukui

• NOJYO Yoshiaki

  Department of Morphological and Physiological Sciences, University of Fukui Faculty of Medical Scien

• Nojyo Yoshiaki

  Department Of Anatomy Fukui Medical School

• Nojyo Yoshiaki

  福井医科大学 歯口外

• Nojyo Yoshiaki

  福井医科大学 解剖

• Sano K

  Department Of Dentistry And Oral Surgery Fukui Medical University

• Sano Kazuo

  Department Of Denitistry And Oral Surgery Fukui Medical University

• Nojyo Y

  Fukui Medical Univ. Fukui Jpn

• Hashimoto K

  Kyoto Univ. Kyoto Jpn

• Enomoto Sumio

  Enomoto Dental Medicine Institute

• Shioda Shigetoshi

  Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Tokyo Medical and Dental Univers

• Shioda Shigetoshi

  Department Of Oral And Maxillofacial Surgery Faculty Of Dentistry Tokyo Medical And Dental Universit

• Hashimoto Kenji

  Department Of Biotechnology And Life Science Tokyo University Of Agriculture And Technology

• Hashimoto Kenji

  Department Of Anatomy Nara Medical University

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