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THE EVALUATION OF PERIODONTAL LIGAMENT CELLS OF RAT TEETH AFTER LOW-TEMPERATURE PRESERVATION UNDER HIGH PRESSURE

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Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº Èò ÁãÀÇ »ó¾Ç ´ë±¸Ä¡¸¦ ¹ß°ÅÇÑ ÈÄ Ä¡ÁÖÀδ뼼Æ÷¸¦ /2 MPa°í¾Ð-Àú¿ÂÇÏ¿¡ 1ÁÖ°£ º¸°ü½ÃÄÑ MTT, WST-1 °Ë»ö¹ýÀ» ÀÌ¿ëÇÏ¿© ÃøÁ¤ÇÑ Ä¡ÁÖÀδ뼼Æ÷ÀÇ È°¼ºµµ¸¦ Àú¼Ó ³Ãµ¿¹ý(No Additional Pressure, 2, 3 MPa), ±Þ¼Ó ³Ãµ¿¹ý(No Additional Pressure, 2 MPa), /90 MPaÃÊ°í¾Ð Àú¿Âº¸Á¸¹ý°ú ºñ±³ÇÏ¿© Æò°¡ÇÏ´Â °ÍÀÌ´Ù. »ýÈÄ 4ÁÖµÈ ¾ÏÄÆ Sprague-Dawley°è ÈòÁãÀÇ »ó¾Ç Á¿ì Á¦1, 2´ë±¸Ä¡¸¦ ¹ß°ÅÇÏ¿© °¢ ±º ´ç 12°³ÀÇ Áã Ä¡¾Æ¸¦ MTT, WST-1 °Ë»ö¿¡ ÀÌ¿ëÇÏ¿´´Ù. ½ÇÇ豺Àº 9°³±ºÀ¸·Î ´ëÁ¶±ºÀº Áï½Ã ¹ßÄ¡±ºÀ̸ç, °¢°¢ 3 MPa, 2 MPa, No Additional Pressure (NAP)ÀÇ ¾Ð·ÂÀ» °¡ÇÑ ÈÄ ¿¡¼­ ±îÁö /min ¼Óµµ·Î ¼­¼­È÷ ³Ãµ¿½ÃŲ µÚ ¿¡ ³Ãµ¿ÇÑ Àú¼Ó ³Ãµ¿±º, ¹ßÄ¡ ÈÄ µ¿ÇعæÁöÁ¦ 󸮰úÁ¤À» °ÅÃÄ °¢°¢ 2 MPa, NPÀÇ ¾Ð·ÂÀ» °¡ÇÑ ÈÄ, ÀÇ ¾×È­Áú¼Ò¿¡ ³Ö¾î ³Ãµ¿ÇÑ ±Þ¼Ó ³Ãµ¿±º, ¹ßÄ¡ ÈÄ °¢°¢ 2MPa,NPÀÇ ¾Ð·ÂÀ» °¡ÇÑ ÈÄ, ¿¡ º¸°üÇÑ Àú¿Â º¸Á¸±º, /90 MPaÀÇ ÃÊ°í¾Ð Àú¿Â º¸Á¸±ºÀ¸·Î ³ª´©¾ú´Ù. º¸Á¸¾×Àº F mediumÀ» »ç¿ëÇßÀ¸¸ç µ¿ÇعæÁöÁ¦·Î 10% dimethylsulfoxide (DMSO)¸¦ »ç¿ëÇÏ¿´´Ù. Ä¡±Ù¸éÀ» ´ÜÀ§¸éÀûÀ¸·Î Ç¥ÁØÈ­Çϱâ À§ÇØ MTT, WST-1 ÃøÁ¤°ªÀ» Eosin ¿°»ö ÈÄ 530 nm¿¡¼­ ÃøÁ¤ÇÑ Èí±¤µµ °ªÀ¸·Î ³ª´©¾ú´Ù. Åë°è ºÐ¼®À» À§ÇØ one way ANOVA¸¦ ½ÃÇàÇÏ¿´À¸¸ç »çÈÄ °ËÁ¤À¸·Î´Â Tukey HSD ¹æ¹ýÀ» »ç¿ëÇÏ¿´°í °á°ú´Â ´ÙÀ½°ú °°´Ù. 1. MTT °Ë»ö¹ý ¹× WST-1 °Ë»ö¹ý °á°ú /2 MPa °í¾Ð Àú¿Â º¸Á¸±ºÀÌ Áï½Ã ¹ßÄ¡±ºº¸´Ù ¼¼Æ÷ È°¼ºµµ°¡ ³·¾ÒÀ¸³ª Åë°èÀû À¯ÀÇÂ÷´Â ¾ø¾úÀ¸¸ç, Àú¼Ó ¾Ð·Â ³Ãµ¿±º(NP, 2 MPa, 3 MPa)°ú, ±Þ¼Ó ¾Ð·Â ³Ãµ¿±º(NP, 2 MPa), Àú¿Âº¸Á¸±º(/NP), ÃÊ°í¾Ð Àú¿Â º¸Á¸±º(/90 MPa)º¸´Ù Åë°èÀûÀ¸·Î À¯ÀÇÂ÷ÀÖ°Ô ³ôÀº ¼¼Æ÷ È°¼ºµµ¸¦ ³ªÅ¸³»¾ú´Ù(p < 0.05). 2. MTT°Ë»ö¹ý ¹× WST-1 °Ë»ö¹ý °á°ú /90 MPa ÃÊ°í¾Ð Àú¿Â º¸Á¸±ºÀÌ °¡Àå ³·Àº ¼¼Æ÷ È°¼ºµµ¸¦ ³ªÅ¸³»¾úÀ¸¸ç, MTT °Ë»ç °á°ú¿¡¼­´Â ¸ðµç ±º¿¡ ´ëÇØ Åë°èÀûÀ¸·Î À¯ÀǼº ÀÖ´Â °á°ú¸¦ º¸¿´´Ù(p < 0.05). À§ÀÇ °á°ú¸¦ ÅëÇØ, /2 MPa (20±â¾Ð)ÀÇ °í¾Ð-Àú¿Â º¸Á¸¹ýÀÌ ´Ù¸¥ ±Þ¼Ó ³Ãµ¿ º¸°ü¹ý(2 MPa, NAP)À̳ª Àú¼Ó³Ãµ¿º¸°ü¹ý(3, 2 MPa, NAP), /90 MPa ÃÊ°í¾Ð Àú¿Â º¸Á¸¹ý¿¡ ºñÇØ ¿ì¼öÇÑ Áã Ä¡¾ÆÀÇ Ä¡ÁÖÀδ뼼Æ÷ÀÇ È°¼ºµµ¸¦ º¸¿© Â÷ÈÄ Ä¡¾ÆÀÇ ÀçÀ̽Ľà ġ¾Æº¸°üÀ» À§ÇÑ ¹æ¹ýÀ¸·ÎÀÇ °¡´É¼ºÀ» Á¦½ÃÇÏ¿´´Ù.

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 under pressure of 2 MPa), group 8 (low-temperature preservation at under no additional pressure), group 9 (low-temperature preservation at 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 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 (/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 under pressure of 2 MPa suggest the possibility for long term preservation of teeth.

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Ä¡ÁÖÀδ뼼Æ÷; È°¼ºµµ; °í¾Ð Àú¿Â º¸Á¸; ±Þ¼Ó ³Ãµ¿; ¾Ð·Â Àú¼Ó ³Ãµ¿
Periodontal ligament cell; MTT; WST-1; Viability; Low temperature preservation under pressure; Rapid freezing; Cryopreservation

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