Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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HISTOLOGY OF DENTAL PULP HEALING AFTER TOOTH REPLANTATION IN RATS

흰 쥐 치아 재식 후 치수 치유 양상의 조직학적 관찰

  • Go, Eun-Jin (Department of Conservative Dentistry, College of Dentistry, Younsei University) ;
  • Jung, Han-Seong (Department of Oral Biology, College of Dentistry, Younsei University) ;
  • Kim, Eui-Seong (Department of Conservative Dentistry, College of Dentistry, Younsei University) ;
  • Jung, Il-Young (Department of Conservative Dentistry, College of Dentistry, Younsei University) ;
  • Lee, Seung-Jong (Department of Conservative Dentistry, College of Dentistry, Younsei University)
  • 고은진 (연세대학교 치과대학 치과보존학교실) ;
  • 정한성 (연세대학교 치과대학 구강생물학교실) ;
  • 김의성 (연세대학교 치과대학 치과보존학교실) ;
  • 정일영 (연세대학교 치과대학 치과보존학교실) ;
  • 이승종 (연세대학교 치과대학 치과보존학교실)
  • Received : 2010.05.29
  • Accepted : 2010.06.30
  • Published : 2010.07.30
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Abstract

The objective of this study was to observe the histology of dental pulp healing after tooth replantation in rats. The maxillary right first molars of 4-week-old rat were extracted, and then the teeth were repositioned in the original socket. At 3 days after replantation, there was localized inflammatory reaction. But, pulp revasculization and healing had already begun in the root area. At 5 days after replantation, odontoblast-like cells were observed. Tertiary dentin deposition was observed beneath the pulp-dentin border from 1 week after replantation. And tertiary dentin was increased at 2 weeks after replantation. The presence of odontoblast-like cells and the formation of tertiary dentin were continued to 4 weeks after replantation. At 4 weeks after replantation, the deposition of bone-like tissues and cementum-like tissues was observed. This results show that there is a possibility of pulp healing after tooth replantation in rats and the mineralization of tooth can progress. The mineralization of tooth after replantation was initially occurred by the deposition of tertiary dentin, but as time passed, the deposition of bone-like tissues and cementum-like tissues was begun and increased.

본 연구의 목적은 흰 쥐(rat)를 이용하여 미성숙 단계의 치아를 발치 후 즉시 재식 하였을 때 나타나는 치수의 치유 양상을 조직학적으로 관찰하고자 하는 것이다. 생후 4주된 암컷 Sprague-Dawley 계 흰쥐의 상악 우측 제1대구치를 발거 후 원래의 치조골와 내로 위치시켰다. 재식 후 3일째부터 국소적으로 치수 내 염증 소견이 관찰되었으나, 치근 부위에서는 이미 치수의 재혈관화 및 치유가 진행되고 있는 소견이 관찰되었다. 재식 후 5일째부터는 odontoblast-like cell이 관찰되기 시작하였다. 삼차 상아질의 형성은 재식 후 1주째부터 관찰되기 시작하였으며, 2주째부터는 확실히 관찰할 수 있었다. Odontoblast-like cell 및 삼차상아질 형성은 4주째까지도 계속 관찰되었다. 재식 후 4주째에는 bone-like tissue 및 cementum-like tissue이 형성되었음을 관찰하였다. 본 실험을 통하여 흰 쥐 치아 재식 시 석회화 과정은 초기에는 삼차상아질 침착에 의해서 진행되나, 시간이 경과하면서 점차 bone-like tissue 또는 cementum-like tissue가 차지하는 비율이 증가하는 것을 관찰하였다.

Keywords

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