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HOME > Restor Dent Endod > Volume 35(4); 2010 > Article
Basic Research The evaluation of periodontal ligament cells of rat teeth after low-temperature preservation under high pressure
Jin-Ho Chung1, Jin Kim2, Seong-Ho Choi3, Eui-Seong Kim1, Jiyong Park4, Seung-Jong Lee1
2010;35(4):-294.
DOI: https://doi.org/10.5395/JKACD.2010.35.4.285
Published online: July 31, 2010

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Corresponding Author: Seung-Jong Lee. Department of Conservative Dentistry, Yonsei University School of Dentistry 134, Shinchon-dong, Sudaemoon-gu, Seoul, 120-752, Korea. Tel: +82-2-2228-3148 Fax: +82-2-313-7575, sjlee@yuhs.ac
• Received: May 29, 2010   • Revised: June 19, 2010   • Accepted: July 3, 2010

Copyright © 2010 Korean Academy of Conservative Dentistry

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  • The purpose of this study was to evaluate the viability of periodontal ligament cells of rat teeth after low-temperature preservation under high pressure by means of MTT assay, WST-1 assay. 12 teeth of Sprague-Dawley white female rats of 4 week-old were used for each group.
    Both side of the first and second maxillary molars were extracted as atraumatically as possible under tiletamine anesthesia. The experimental groups were group 1 (Immediate extraction), group 2 (Slow freezing under pressure of 3 MPa), group 3 (Slow freezing under pressure of 2 MPa), group 4 (Slow freezing under no additional pressure), group 5 (Rapid freezing in liquid nitrogen under pressure of 2 MPa), group 6 (Rapid freezing in liquid nitrogen under no additional pressure), group 7 (low-temperature preservation at 0℃ under pressure of 2 MPa), group 8 (low-temperature preservation at 0℃ under no additional pressure), group 9 (low-temperature preservation at -5℃ under pressure of 90 MPa). F-medium and 10% DMSO were used as preservation medium and cryo-protectant. For cryo-preservation groups, thawing was performed in 37℃ water bath, then MTT assay, WST-1 assay were processed. One way ANOVA and Tukey HSD 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 7 (0℃/2 MPa) showed higher viability of periodontal ligament cells than other group (2-6, 8) and this was statistically significant (p < 0.05), but showed lower viability than group 1, immediate extraction group (no statistical significance).
    By the results of this study, low-temperature preservation at 0℃ under pressure of 2 MPa suggest the possibility for long term preservation of teeth.
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Figure 1
Schematic diagram of program freezer with pressure vessel.
a. Oxygen container: 2 or 3 MPa of pressure, b. Program freezer, c. Pressure bottle, d. 2 ml Cryotube: 1 ml F medium + 10% DMSO, e. Tooth treated 10% DMSO, f. Pressure valve, g. Thermometer.
jkacd-35-285-g001.jpg
Table 1
Experimental Groups
jkacd-35-285-i001.jpg
Table 2
The averages and standard deviations of optical density of MTT

a,b,c,d,e,f: Different superscript letters means statistical difference (p < 0.05).

jkacd-35-285-i002.jpg
Table 3
The averages and standard deviations of optical density of WST-1

a,b,c,d,e,f: Different superscript letters means statistical difference (p < 0.05).

jkacd-35-285-i003.jpg

Tables & Figures

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    • Evaluation of the Viability of Rat Periodontal Ligament Cells after Storing at 0℃/2 MPa Condition up to One Week: In Vivo MTT Method
      Sun Mi Jang, Sin-Yeon Cho, Eui-Seong Kim, Il-Young Jung, Seung Jong Lee
      Journal of Korean Dental Science.2016; 9(1): 1.     CrossRef

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    The evaluation of periodontal ligament cells of rat teeth after low-temperature preservation under high pressure
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    Figure 1 Schematic diagram of program freezer with pressure vessel. a. Oxygen container: 2 or 3 MPa of pressure, b. Program freezer, c. Pressure bottle, d. 2 ml Cryotube: 1 ml F medium + 10% DMSO, e. Tooth treated 10% DMSO, f. Pressure valve, g. Thermometer.
    The evaluation of periodontal ligament cells of rat teeth after low-temperature preservation under high pressure

    Experimental Groups

    The averages and standard deviations of optical density of MTT

    a,b,c,d,e,f: Different superscript letters means statistical difference (p < 0.05).

    The averages and standard deviations of optical density of WST-1

    a,b,c,d,e,f: Different superscript letters means statistical difference (p < 0.05).

    Table 1 Experimental Groups

    Table 2 The averages and standard deviations of optical density of MTT

    a,b,c,d,e,f: Different superscript letters means statistical difference (p < 0.05).

    Table 3 The averages and standard deviations of optical density of WST-1

    a,b,c,d,e,f: Different superscript letters means statistical difference (p < 0.05).


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