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An Electron Macroscopic Studies Of Radiation Effects On The Enamel Development Of The Rat Molar

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Abstract

Å»ý 14ÀÏµÈ ¹é¼­¿Í Å»ý 19ÀÏµÈ ¹é¼­¿¡ 396cGyÀÇ ¹æ»ç¼±À» Á¶»çÇÑ ÈÄ Å»ý 15ÀÏ, 18ÀÏ,
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1. ½ÇÇ豺Àº ´ëÁ¶±º¿¡ ºñÇÏ¿© Àü¹ÝÀûÀ¸·Î ¹ý¶ûÁúÀÇ ¹ßÀ°ÀÌ ´Ê¾îÁ® ¹ý¶ûÁú°ú »ó¾ÆÁúÇü¼ºÀÌ
Áö¿¬µÇ¾ú´Ù.
2. ½ÇÇ豺¿¡¼­´Â Àü¹ÝÀûÀ¸·Î ³»Ä¡¼¼Æ÷ÀÇ ¹è¿­ÀÌ ºÒ±ÔÄ¢ÇßÀ¸¸ç ¼¼Æ÷³»¿¡¼­ ¸¹Àº °øÆ÷µéÀÌ
º¸¿´°í »ç¸³ ü¿Í °ú¸³ÇüÁú³»¼¼¸ÁÀÇ È®Àå°ú ¼¼Æ÷°£±ØÀÇ È®´ë, ¼¼Æ÷±Ø¼ºÀÇ ¼Ò½Ç µîÀÌ °üÂûµÇ
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3. 1±ºÀÇ »ýÈÄ 2ÀÏ Èñ»ý¼Ò°ß¿¡¼­ ¹ý¶ûÁú Çü¼ºÀÌ °üÂûµÇÁö ¾Ê¾ÒÀ¸³ª 25ÀÏ Èñ»ý¼Ò°ß¿¡¼­´Â
Ãʱâ À¯±â±âÁú ¹× ÀϺΠ¹ý¶ûÁúÀÇ Çü¼ºÀÌ °üÂûµÇ¾úÀ¸¸ç ¾ÆÁ÷ Tomes' process´Â ¹ß°ßµÇÁö ¾Ê
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4. 2±º¿¡¼­´Â 1±ºÀÇ µ¿ÀϽà ±â ¼Ò°ß°ú À¯»çÇÑ Á¶Á÷ ¼Ò°ßÀ» º¸¿´À¸³ª ¼¼Æ÷ÀÇ ÀÌÇü¼º Á¤µµ
°¡ ½ÉÇÏ¿´À» »Ó¸¸ ¾Æ´Ï¶ó ¹ßÀ°µµ ÀúÁ¶ÇÏ¿´´Ù.
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Mandibular first molars of the rats were undertaken to observe the radiosensitivity of
amelogenesis. Twenty four Sprague-Dawley rats received 396cGy radiation with the MK
Cell irradiator using Cs-137, and twenty four rats served as control. They were devided
into two groups; Group 1 which received radiation at the 14th day after gestation and
group 2 which received radiation at the 19th day after gestation.
Light Microscopy and Transmitted Electron Microscopy investigation was undertaken
in the group 1 at the 15th, 18th, 20th, 22nd(2 days after birth), and 25th day(5 days
after birth) after gestation, and in the group 2 at the 21th(birth day), 22nd(2 day after
birth), and 25th(5 days after birth) day after gestation.
The following histopathologic findings were obtained.
1. Compacted with control group, expenmental group showed a delayed formation of
enamel and dentin due to slow Tate of differentiation of undifferentiated mesenchymal
cells.
2. In the experimental groups, the arrangement of the inner enamel epithelium was
irregular and there were many vacuoles in the cytoplasm. There were dilated rER and
mitochondria, increase of the intercellular space, and loss of the cellular polarity.
3. In the group 1, early enamel without Tomes' process, and early organic matrix was
observed at the 25th day after gestation.
4. In the group 2, histopathologic changes were similar to those of the group 1, but
the degree of changes was more severe than that of the group 1.

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