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http://dx.doi.org/10.5395/JKACD.2009.34.4.356

THE EFFICACY OF PROGRAMMED CRYO-PRESERVATION UNDER PRESSURE IN RAT PERIODONTAL LIGAMENT CELLS  

Lee, Young-Eun (Department of Conservative Dentistry, College of Dentistry, Yonsei University)
Kim, Eui-Seong (Department of Conservative Dentistry, College of Dentistry, Yonsei University)
Kim, Jin (Department of Oral Pathology, Oral Cancer Research Center, Yonsei University)
Han, Seung-Hoon (Department of Conservative Dentistry, Kangbuk Samsung Hospital)
Lee, Seung-Jong (Department of Conservative Dentistry, College of Dentistry, Yonsei University)
Publication Information
Restorative Dentistry and Endodontics / v.34, no.4, 2009 , pp. 356-363 More about this Journal
Abstract
The purpose of this study was to evaluate the viability of periodontal ligament cells in rat teeth using slow cryo-preservation method under pressure by means of MTT assay and WST-1 assay. Eighteen teeth of Sprague-Dawley white female rats of 4 week-old were used for each group. Both sides of the first and second maxillary molars were extracted as atraumatically as possible under Tiletamine anesthesia. The experimental groups were group 1 (Immediate control), group 2 (Cold preservation at $4^{\circ}C$for 1 week), group 3 (Slow freezing), group 4 (Slow freezing under pressure of 3 MPa). F-medium and 10% DMSO were used as preservation medium and cryo-protectant. For cryo-preservation groups, thawing was performed in $37^{\circ}C$water bath, then MTT assay and WST-1 assay were processed. One way ANOVA and Tukey method were performed at the 95% level of confidence. The values of optical density obtained by MTT assay and WST-1 were divided by the values of eosin staining for tissue volume standardization. In both MTT and WST-1 assay, group 4 showed significantly higher viability of periodontal ligament cells than group 2 and 3 (p < 0.05), but showed lower viability than immediate control group. By the results of this study, slow cryo-preservation method under pressure suggests the possibility for long term cryo-preservation of the teeth.
Keywords
periodontal ligament cell; MTT; WST-1; viability; pressure; cryo-preservation;
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Times Cited By KSCI : 2  (Citation Analysis)
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