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THE EFFECTS OF IRRADIATION AND CALCIUM-DEFICIENT DIET ON DENTIN AND CEMENTUM FORMATION OF RAT MOLAR

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Abstract

¹æ»ç¼±°ú Ä®½·°áÇÌÀÌ Çü¼ºÁßÀÎ ¹é¼­ Á¦1´ë±¸Ä¡ÀÇ »ó¾ÆÁú°ú ¹é¾ÇÁúÇü¼º¿¡ ¹ÌÄ¡´Â ¿µÇâÀ»
±¸¸í ÇÏ°íÀÚ. 3ÁÖ·ÉÀÇ Sprague-Dawley°è ¹é¼­¸¦ ÀӽŽÃŲ ´ÙÀ½, ¹æ»ç¼±ºñÁ¶»ç-Á¤»ó½ÄÀ̱º
À» ´ëÁ¶±ºÀ¸·Î, ¹æ»ç¼±Á¶»ç-Á¤»ó½ÄÀ̱º°ú ¹æ»ç¼±Á¶»ç-ÀúÄ®½·½ÄÀ̱ºÀ» ½ÇÇ豺À¸·Î ¹èÁ¤ÇÏ¿´
´Ù. ¹æ»ç¼±Á¶»ç´Â ų» ¹é¼­ÀÇ Ä¡¹è ¹ßÀ°½Ã±âÀÎ ÀӽŠ19ÀÏ¿¡ 350 cGyÀÇ Co-60 ¥ã¼±À» ÀÓ½Å
¹é¼­ÀÇ º¹ºÎ¿¡ ÀÏȸ ½ÃÇàÇÏ¿´À¸¸ç, ÀúÄ®½·½ÄÀÌ Åõ¿©ÀÇ °æ¿ì, ½ÄÀÌ´Â Ãâ»ê 3ÀÏÀüºÎÅÍ ¸ð¹é¼­
¿¡ Ä®½· 0.01%, ÀÎ 0.95%, ºñŸ¹Î D 340 IU/100gmÀÌ ÇÔÀ¯µÈ ÀúÄ®½·°íÇü»ç·áÀ̾úÀ¸¸ç À̸¦
¸ê±ÕµÈ Áõ·ù¼ö¿Í ÇÔ²² ¼·Ãë½ÃÄ×´Ù. °¢±ºÀÇ »ýÈÄ 14ÀÏµÈ Àڹ鼭¸¦ Èñ»ý½ÃÄÑ ´ë±¸Ä¡ Ä¡¹è¸¦
Æ÷ÇÔÇÑ »ó¾Ç°ñÀ» ÀýÃëÇÑ ÈÄ, À̵éÀ» ±¤ÇÐÇö¹Ì°æ°ú Åõ°úÀüÀÚÇö¹Ì°æÀ» ÀÌ¿ëÇÑ º´¸®Á¶Á÷ÇÐÀû
¹× ÆÄÀ̺ê·Î³ØƾÀÇ Ç×ü¸¦ ÀÌ¿ëÇÑ ¸é¿ªÁ¶Á÷È­ÇÐÀû ¹æ¹ýÀ¸·Î °¢°¢ °üÂûÇÏ¿© ´ÙÀ½°ú °°Àº °á
°ú¸¦ ¾ò¾ú´Ù.
1. Ä¡¾ÆÇü¼º¼¼Æ÷ÀÇ ºÐÈ­¿Í °ü·ÃµÈ Hertwig»óÇÇ »Ñ¸®Áý¿¡¼­´Â, ¹æ»ç¼±Á¶»ç-Á¤»ó½ÄÀ̱º°ú
¹æ»ç¼±Á¶»ç-ÀúÄ®½·½ÄÀ̱º ¸ðµÎ ¹æ»ç¼±Á¶»ç¿¡ ÀÇÇؼ­ »óÇǼ¼Æ÷ÀÇ ¹è¿­»óÅ°¡ ºÒ±ÔÄ¢ÇØÁ³°í,
¼¼Æ÷°£ÀÇ °áÇÕº¹ÇÕü°¡ ÀϺΠÆı«µÇ¾úÀ¸¸ç, Hertwig»óÇǻѸ®ÁýÀÇ ³»Ãø ±âÀú¸·ÀÇ ÆÄÀ̺ê·Î³Ø
ƾ ¸é¿ª¹ÝÀÀÀÌ ´ëÁ¶±º¿¡ ºñÇÏ¿© °¨¼ÒµÇ¾ú´Ù.
2. ¹é¾ÇÁúÇü¼ººÎ¿¡¼­´Â. ¹æ»ç¼±Á¶»ç-Á¤»ó½ÄÀ̱º°ú ¹æ»ç¼±Á¶»ç-ÀúÄ®½·½ÄÀ̱º ¸ðµÎ ¹é¾Ç¸ð
¼¼Æ÷ÇÙÀÇ Å©·Î¸¶Æ¾°ú¸³ÀÌ ÀÀÁýµÇ¾úÀ¸¸ç, ¹é¾Ç±âÁú³»¿¡ ºÐÆ÷ÇÑ ÆÄÀ̺ê·Î³ØƾÀÇ ¸é¿ª¹ÝÀÀÀº
´ëÁ¶±º¿¡¼­º¸´Ù ¹æ»ç¼±Á¶»ç±º¿¡¼­ ¹Ì¾àÇÏ¿´°í, ÀúÄ®½·½ÄÀ̱º¿¡¼­ ÀÌ ¹ÝÀÀÀÌ ´õ¿í °¨¼ÒµÇ¾ú
´Ù.
3. »ó¾ÆÁúÇü¼ººÎ¿¡¼­´Â. ¹æ»ç¼±Á¶»ç-Á¤»ó½ÄÀ̱º°ú ¹æ»ç¼±Á¶»ç-ÀúÄ®½·½ÄÀ̱º ¸ðµÎ »ó¾Æ¸ð
¼¼Æ÷ÀÇ ¼¼Æ÷Áú³»¿¡ ¿ëÇؼÒü°¡ ÃâÇöÇÏ¿´°í, »ó¾Æ¸ð¼¼Æ÷¸¦ ¿¬°áÇÏ´Â °áÇÕº¹ÇÕü°¡ ½ÉÇÏ°Ô ÆÄ
±«µÇ¾ú´Ù. ¹æ»ç¼±Á¶»ç¿Í ÀúÄ®½·½ÄÀÌ¿¡ ÀÇÇÏ¿© »ó¾Æ±âÁú¿¡ ºÐºñµÈ Ä¡¹ÐüÀÇ ¼ö¿Í ¹Ðµµ°¡ °¨
¼ÒµÇ°í ¸¹Àº ¼öÀÇ °øÆ÷°¡ »êÀçµÇ¾î ÀÖ¾úÀ¸¸ç, ÆÄÀ̺ê·Î³ØƾÀÇ ¸é¿ª¹ÝÀÀµµ °¨¼ÒµÇ¿´´Ù.
ÀÌ»óÀÇ ¿¬±¸°á°ú·Î ¹Ì·ç¾î ¹æ»ç¼±Á¶»ç´Â ¾Æ ¹ß»ý½Ã Çü¼º¼¼Æ÷ÀÇ ºÐÈ­¿Í ±âÁúÇü¼º°úÁ¤¿¡,
ÀúÄ®½·½ÄÀÌ´Â ÁÖ·Î ±âÁúÇü¼º°ú ºÐºñ°úÁ¤¿¡ Àå¾Ö¸¦ ÁÖ´Â °ÍÀ¸·Î »ç·áµÈ´Ù.
#ÃÊ·Ï#
The present study was designed to elucidate the effects of the Co-60 ¥Ô irradiation
and/or calciumdeficient diet on the dentin and cementum formation of rat molar. The
pregnant three-week old Sprague-Dawley rats were used for the study. The
experimental group was divided into two groups, irradiation/normal diet group and
irradiation/calcium-deficient diet group. The control group was non-irradiation/normal
diet group. The abdomen of the rats at the 19th day of pregnancy were irradiated with
single absorbed dose of 350 cGy. The rat pups were sacrlficed on the 14th day after
delivery and the maxillae including molar tooth germ were taken. The specimens
including the 1st molar tooth germ were prepared to make tissue sections for light and
transmission electron microscopy. Some of tissue sections for light microscopy were
stained immunohistochemically with anti-fibronectin antibody.
The results were as follows ;
1. The Hertwig's epithelial root sheath cells, which are related to the differentiation of
the tooth-forming cells, showed irregular cellular arrangement, decrease of intercellular
junctional complex, and decreased imrnunoreactivity to the fibronectin after irradiation.
These were more severe in the irradiation/calcium deficient diet group.
2. The cementoblasts at the cementum-forming area showed chromatin clumpings
after irradiation. The immu noreactivity to the fibronectin was weaken after irradiation,
especially irradiation/calcium-deficient diet group.
3. The odontoblasts at the dentin-forming area showed increase of lysosomes in the
cytoplasm and destruction of intercellular junctional complex. The
irradiation/calcium-deficient diet group showed decrease of number and density of the
electron dense particles and a large number of vacuoles scattered in the dentin matrix.
The immunoreactivity was weaken.

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