Journal of the Korean Association of Oral and Maxillofacial Surgeons

The Korean Association of Oral and Maxillofacial Surgeons (대한구강악안면외과학회)
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Demyelination of neurofilament protein 200 immune positive never fibers in human pulp

사람 치수 내에서 neurofilament protein 200 면역양성반응을 나타내는 신경섬유의 탈말이집 현상에 대한 연구

  • Jang, Jung-Woo (Department of Oral and Maxillofacial Surgery, Kyungpook National University) ;
  • Choi, So-Young (Department of Oral and Maxillofacial Surgery, Kyungpook National University) ;
  • Kwon, Dae-Geon (Department of Oral and Maxillofacial Surgery, Kyungpook National University) ;
  • Bae, Yong-Chul (Department of Oral Histology and Anatomy, School of Dentistry, Kyungpook National University) ;
  • Kim, Chin-Soo (Department of Oral and Maxillofacial Surgery, Kyungpook National University) ;
  • Lee, Sang-Han (Department of Oral and Maxillofacial Surgery, Kyungpook National University)
  • 장정우 (경북대학교 치의학전문대학원 구강악안면외과학교실) ;
  • 최소영 (경북대학교 치의학전문대학원 구강악안면외과학교실) ;
  • 권대근 (경북대학교 치의학전문대학원 구강악안면외과학교실) ;
  • 배용철 (경북대학교 치의학전문대학원 구강해부학교실) ;
  • 김진수 (경북대학교 치의학전문대학원 구강악안면외과학교실) ;
  • 이상한 (경북대학교 치의학전문대학원 구강악안면외과학교실)
  • Received : 2010.06.10
  • Accepted : 2010.10.20
  • Published : 2010.10.29
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Abstract

Introduction: Mammalian tooth pulp is densely innervated by sensory nerves that are mostly C fibers and A delta fibers. However, there is evidence suggesting that many unmyelinated axons in the pulp are in fact parent meylinated axons. Immunohistochemical staining for neurofilament protein 200 kDa (NFP200) was performed to identify the demyelinated but parent myelinated axons. Materials and Methods: The pulp was removed from healthy premolars and 3rd molars extracted from juveniles and adults undergoing orthodontic treatment, and immunohistochemical staining were applied with NPF200 antibodies, which specifically dye myelinated axons. The specimens underwent an electron microscopy examination with diaminobenzidine (DAB) immunostaining after observation and analysis by fluorescence and confocal laser scanning microscopy. Results: The NPF200 immuno-positive axons in the radicular pulp areas were observed as bundles of many nerve fibers. Many small bundles were formed with fewer axons when firing to the coronal pulp areas and then reachrd a different direction. In the radicular pulp, unmyelinated axons and myelinated axons were present together. However, in the coronal pulp, unmyelinated axons were most common and NFP200 immuno-positive unmyelinated axons with a larger diameter than those in the radicular pulp were observed more frequently. On the other hand, most of the immuno-positive unmyelinated fibers were similar in size to that of typically well-known unmyelinated fibers. Conclusion: Myelinated fibers innervated to the dental pulp maintain their myelins in the radicular portion, but these fibers lost myelins in the coronal portion. After the loss of myelin, the size of the axoplasm also decreased.

Keywords

References

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