Journal of the Korean Academy of Pediatric Dentistry 2008;35(2):205-215.
Published online May 31, 2008.
DEVELOPMENT OF ALLOTRANSPLANTED TOOTH GERMS AT VARIOUS DEVELOPMENTAL STAGE INTO THE WHITE RAT'S EXTRACTION SOCKET
Hwi-Hoon Jung1, Han-Sung Jung2, Seoung-Oh Kim1, Hyung-Jun Choi1, Jae-Ho Lee1, Byung-Jai Choi1
1Department of Pediatric Dentistry, Yonsei University
2Department of Oral Biology, College of Dentistry and Oral Science Research Center, Yonsei University 
Correspondence:  Byung-Jai Choi,  Tel: 02-2228-3174, Email: bjchoi@yuhs.ac
Abstract
The purpose of this study is to evaluate at which stage of tooth germ would develop into normal calcification and hence to increase the success rate of transplantation. Therefore, tooth germs on the 15th, 17th embryonic day and the 3rd day of birth were separated for allotransplantation into maxilla of adult rat of 11 weeks. Calcification processes were analyzed radiographically and histopathologically at 4 weeks and 8 weeks after allotransplantation. The results are as follows: 1. Allotransplanted tooth germ at 4 weeks and 8 weeks showed delayed calcification compared to that of normal odontogenesis. 2. At 4 weeks, abnormal calcified tissue, such as odontoma and ankylosis of osteodentin with surrounding alveolar bone were observed. 3. At 8 weeks, allotransplanted tooth germs of the 15th and 17th embryonic day showed calcification and osteodentin surrounded by periodontal ligament. 4. At 8 weeks, allotransplanted tooth germs of the 3rd day of birth showed calcification composed of cementum and osteodentin. In this study, we observed small sized and amorphous calcified tissue from allotropic allotransplantation of tooth germs. Since these calcified tissue were underdeveloped and shaped irregularly, for calcification into normal tooth form, further study needs consideration about the reduction of surgical trauma, developmental stage of transplanted tooth germ, blood supply from recipient site, fixation method in transplanted site and period of transplantation.
Key Words: Allotransplantation, Tooth germ, Odontogenesis
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