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THE EFFECTS OF IRRADIATION AND HYPERVITAMINOSIS D2 ON THE ODONTOGENESIS IN THE RAT INCISOR

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Abstract

°á·Ð
ÀúÀÚ´Â ¹é¼­ 150¸¶¸®¸¦ ´ë»óÀ¸·Î ´ëÁ¶±º°ú ½ÇÇ豺À¸·Î ³ª´©¾úÀ¸¸ç ´ëÁ¶±ºÀº Á¤»ó±º,
Vitamin D2 °ú·®Åõ¿©±º(80,000 units), ¹æ»ç¼±Á¶»ç±º(800 R, 1,500 R)À¸·Î ±¸
ºÐÇÏ¿´°í, ½ÇÇ豺Àº Vitamin D2 20,000 units¸¦ 1ÁÖ °£°ÝÀ¸·Î 4ȸ ºÐÇÒ ÁÖ»ç
ÇÑ ÈÄ 800 Rads¿Í 1,500 RadsÀÇ ¹æ»ç¼±À» Á¶»çÇÏ°í °¢°¢ 1ÀÏ, 3ÀÏ, 1ÁÖ, 2ÁÖ, 4ÁÖ °£°ÝÀ¸·Î
Èñ»ý½ÃÄÑ ÇϾǰñÀ» ÀýÃëÇÏ¿© Åë¹ý¿¡ µû¶ó paraffin ÀýÆíÀ» Á¦ÀÛ Hem-atoxylin-eosinÁß¿°»ö
ÈÄ °Ë°æÇÏ¿© ´ÙÀ½ÀÇ °á·ÐÀ» ¾ò¾ú´Ù.
1. ¹æ»ç¼±Á¶»ç¿¡¼­ Ãʱ⿡ Á¶»ó¾Æ¼¼Æ÷ÀÇ º¯¼ºÀ¸·Î ÀÎÇÑ »ó¾ÆÁúÇü¼ººÎÀü°ú À¯¾à»ó¾ÆÁúÇü¼º
À» º¸¿´À¸¸ç ƯÈ÷ 1,500 Rads¿¡¼­ ´õ¿í ½ÉÇÏ¿© 1ÁÖ¿¡ Ä¡±Ù´ÜºÎ¿¡¼­ °ñ¾ç»ó¾ÆÁúÇü¼º ¹× Ä¡À¯
µÎÀÇ ½ÉÇÑ ¼Õ»óÀ» º¸¿´´Ù.
2. Vitamin D2 Åõ¿©¿¡¼­ Ãʱ⿡ »ó¾ÆÁúÃþÀÇ ºñ¹Ú»óÀ» º¸¿´À¸³ª ½ÃÀÏÀÌ °æ
°úÇϸ鼭 Àü»ó¾ÆÁúÃþ°ú »ó¾ÆÁúÃþÀÌ ºñÈĵǸç 4ÁÖ¿¡¼­ »ó¾ÆÁúÀº ±¸°£»ó¾ÆÁú·Î ±¸¼ºµÈ ºñÈĵÈ
¼Ò°ßÀ» º¸ÀÌ¸ç ¼³Ãø¿¡¼­ ´õ¿í ½ÉÇÏ¿´´Ù.
3. Vitamin D2Åõ¿©¿Í ¹æ»ç¼±Á¶»çÀÇ º´¿ë½Ã¿¡´Â Á¶»ó¾Æ¼¼Æ÷¿Í Ä¡¹èÁÖÀ§ÀÇ
¹ÌºÐÈ­ °£¿±¼¼Æ÷ ¹× Ä¡¼öÁ¶Á÷¿¡ ½ÉÇÑ ¼Õ»óÀ» º¸¿´À¸¸ç Ãʱ⿡ »ó¾ÆÁúÃþÀÌ ºñ¹ÚµÈ ¼Ò°ßÀ» º¸
¿´À¸³ª ½ÃÀÏÀÌ °æ°úÇϸ鼭 Àü»ó¾ÆÁúÃþÀÇ ¼®È¸È­·Î ±¸°£»ó¾ÆÁú·Î Çü¼ºµÈ ºñÈÄµÈ »ó¾ÆÁúÃþÀ»
º¸¿´´Ù.
4. °ú·®ÀÇ Vitamin D2 Åõ¿©ÈÄ 800 Rads Á¶»ç¿¡¼­ 1ÁÖ¿¡ ¼³Ãø¿¡¼­ °ñ¾ç»ó¾Æ
ÁúÇü¼ºÀ» º¸¿´À¸¸ç 1,500 RadsÁ¶»ç¿¡¼­´Â 1ÁÖ¿¡ Çù¼³Ãø ¸ðµÎ¿¡¼­ °ñ¾ç»ó¾ÆÁúÇü¼º ¹× ¹ý¶û¾Æ
¼¼Æ÷ÀÇ À§Ãà¼Ò°ßÀ» º¸¿© 2ÁÖ¿¡¼­ ¹ý¶û¾Æ¼¼Æ÷ÀÇ ºÎÁ¾ ¹× ±Ø¼º¼Ò½Ç·Î ¹ý¶ûÁú ¹ßÀ°ºÎÀüÀ» º¸¿´
´Ù.
5. Àü ½ÇÇèÀ» ÅëÇØ °ú·®ÀÇ Vitamin D2 Åõ¿©¿Í ¹æ»ç¼±Á¶»ç´Â Á¶»ó¾Æ¼¼Æ÷, Ä¡
À¯µÎÀÇ ¹ÌºÐÈ­ °£¿±¼¼Æ÷, Ä¡¹èÀÇ ¹Ì¼º¼÷¼¼Æ÷¿¡ ½ÉÇÑ ¼Õ»óÀ» ÁÖ¾úÀ¸¸ç º´¿ë½Ã¿¡´Â ¼Õ»óÀº ´õ
¿í ½ÉÇÏ¿© ¹ý¶û¾Æ¼¼Æ÷¿¡µµ ¿µÇâÀ» ¹ÌÃÄ ¹ý¶ûÁú¹ßÀ°ºÎÀüÀ» ¾ß±â½ÃÄ×´Ù.
#ÃÊ·Ï#
150 rats weighting about 150gm were devided into control group of 80 and
experimental group of 70. Control group was subdivided into the irradiated vitamin D
injection group and X-ray irradiated group. Experimental group was given 2.0§·
ergocalciferol by four intramuscular injection prior to X-ray irradiation with single 800
rads and 1,500 rads respectively. Experimental animals from each group was sacrificed
after 1, 3, 7, 14, and 28 days and their incisors were investigated by histopathological
examination.
The results were as follows;
1. In the irradiated groups, it showed dentin hypoplasia and formation of dentinoid
substance caused by degeneration of odontoblast at the early stage. Especially,1,500 rads
group which was severely effected showed formation of osteoid dentin at the apical
portion and severe injuries of dental papilla at the first week.
2. In the vitamin D2 administration group, it showed thinned dentin layer at the early
stage but, taking time, predentin and dentin layer was thickened. At the fourth week,
dentin was chiefly composed of interglobular dentin, especially in the lingual portion.
3. Using in combination of overdose vitamin D2 administration and X-ray irradiation,
it effected severely odontoblast, undifferentiated mesenchymal cells around tooth germ
and pulp tissue. At the early stage, dentin layer was thinned but, taking time, it was
thickened and composed of interglobular dentin caused by calcification of predentin layer.
4. In 800 rads irradiation after the overdose vitamin D2 administration, it showed
formation of osteoid dentin in the lingual portion at the first week. In the 1,500 rads
irradiation after the overdose vitamin D2 administration, it showed formation of osteoid
dentin and degeneration of ameloblast in both buccal and lingual portion at the first
week, and enamel hypoplasia caused by edema and loss of polarity of ameloblasts at the
second week.
5. By the entire experiment, the overdose vitamin D2 administration and X-ray
irradiation effected severely odontoblasts, undifferentiated mesenchymal cells of dental
papilla, and primitive cells of tooth germ among the dental tissue. Especially using
combination of overdose vitamin D2 administration and X-ray irradiation also effected
ameloblasts, resulting in enamel hypoplasia.

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