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THE EXPERIMENTAL STUDY OF 60CO IRRADIATION EFFECTS ON THE MANDIBULAR CONDYLE AND MANDIBULAR GROWTH IN WHITE RAT

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Abstract

l0GyÀÇ 60coÀ» ¹ßÀ°ÁßÀÎ Sprague-Dawley°èÀÇ ¿õ¼º ¹é¼­ÀÇ ÇϾǰúµÎºÎ¿¡
±¹¼Ò Á¶»çÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. ¹æ»ç¼± Á¶»ç 1ÁÖÈÄ¿¡¼­ ½ÇÇ豺Àº ´ëÁ¶±ºº¸´Ù üÁßÁõ°¡°¡ ´Ù¼Ò µÐÈ­µÇ¾úÀ¸¸ç »çÁø°èÃø
¿¡¼­´Â º° Â÷À̸¦ º¼ ¼ö ¾ø¾ú°í Á¶Á÷Ç¥º»¿¡¼­´Â ¿¬°ñÃþÀÌ ¾ã¾ÆÁø °ÍÀ» º¼ ¼ö ÀÖ¾ú´Ù.
2. ¹æ»ç¼± Á¶»ç 2ÁÖÈÄ¿¡¼­ ½ÇÇ豺°ú ´ëÁ¶±º °øÈ÷ ºñ½ÁÇÑ Ã¼ÁßÁõ°¡¸¦ º¸¿´À¸³ª »çÁø°èÃø¿¡
¼­´Â ÀÌ°ø¿¡¼­ ÀýÄ¡ ÷´Ü±îÁö (Mf-It)ÀÇ °Å¸®°¡ ½ÇÇ豺¿¡¼­ ´õ ±ä °ÍÀ¸·Î ³ªÅ¸³µ°í Á¶Á÷Ç¥
º»¿¡¼­´Â ¹æ»ç¼±À¸·Î ÀÎÇÑ ¼Õ»óÀÌ È¸º¹µÇ±â ½ÃÀÛÇÑ °ÍÀ» º¼ ¼ö ÀÖ¾úÀ¸³ª ¿¬°ñ¼¼Æ÷ÃæÀº ´ëÁ¶
±º¿¡ ºñÇØ ¾ã¾ÆÁ® ÀÖ¾ú´Ù.
3. ¹æ»ç¼± Á¶»ç 3ÁÖÈÄ¿¡¼­ °ñÁÖÀÇ È¸º¹¼Ò°ßÀ» º¼ ¼ö ÀÖ¾úÀ¸¸ç ÇϾǰúµÎ¿¡¼­ ÇϾǰñ Æò¸é
±îÁö (Cd-Cd')ÀÇ °Å¸®´Â ½ÇÇ豺¿¡¼­ ¿ÀÈ÷·Á ´õ ±ä °ÍÀ¸·Î ³ªÅ¸³µ°í üÁßÁõ°¡´Â ´ëÁ¶±º°ú
ºñ½ÁÇÏ¿´´Ù.
4. ¹æ»ç¼± Á¶»ç 4ÁÖÈÄ¿¡¼­ Áõ½Ä¼¼Æ÷´ëÀÇ ¼¼Æ÷µéÀÌ °ÅÀÇ Á¤»óÀ¸·Î ȸº¹µÈ ¼Ò°ßÀ» º¼ ¼ö ÀÖ
¾úÀ¸³ª ¿¬°ñ¼¼Æ÷ÃþÀº ¾ÆÁ÷µµ ´ëÁ¶±º¿¡ ºñÇØ ¾ã¾ÆÁ® ÀÖ¾ú´Ù. »çÁø°èÃø¿¡¼­´Â ÀÌÁ¡¿¡¼­ Àü¹æ
ÀýÈç±îÁö (Me-An), Á¦Àϴ뱸ġ¿¡¼­ ÇϾǰñ Æò¸é±îÁö(Fm-Fm')ÀÇ °Å¸®°¡ ´ëÁ¶±ºº¸´Ù ªÀº
°ÍÀ¸·Î ³ªÅ¸³µÀ¸¸ç üÁßÁõ°¡µµ ´ëÁ¶±º¿¡ ºñÇØ ÈξÀ Àû¾ú´Ù.
5. ¸é¿ªÁ¶Á÷È­ÇÐÀû °Ë»ö¿¡¼­ S-100Ç×ü´Â ½ÇÇ豺ÀÌ ´ëÁ¶±ºº¸´Ù ¾ç¼º¹ÝÀÀÀ» ³ªÅ¸³»´Â ¼¼Æ÷
ÀÇ ¼ö°¡ Áõ°¡ÇÏ¿´À¸¸ç Áõ½Ä¼¼Æ÷Ãþ¿¡¼­´Â ¾ç¼º¹ÝÀÀÀÌ ÇöÀúÇÏ°Ô ¶³¾îÁ³´Ù.
ProteoglycanÇ×ü, Type I±³¿øÁú Ç×ü¿¡¼­´Â ½ÇÇ豺ÀÌ ´ëÁ¶±º¿¡ ºñÇØ ¾ç¼º¼¼Æ÷°¡ ¾à°£ °¨
¼ÒµÈ ¹ÝÀÀÀ» º¸¿´°í, Type II ±³¿øÁú Ç×ü¿¡¼­´Â ½ÇÇ豺°ú ´ëÁ¶±ºÀÇ Â÷À̸¦ ÀÎÁöÇÒ ¼ö ¾ø¾ú´Ù.
#ÃÊ·Ï#
This study was performed to understand the irradiation effects on the mandibular
condyle and mandibular growth in developing white rats. Forty eight white male rats of
the Sprague-Dawley strain aged 4 weeks, were devided into two groups; control group
and experimental group A single target dose of 10Gy of radiation was given to the
mandibular condylar area and the observations of the photo analysis, radiologic,
histopathologic and immunohistochemical study revealed as follows;
1. Animals killed one week after irradiation showed lesser increase in body weights,
no difference in photo analysis and decreased thickness of cartilagenous layers of the
condyle than the control group.
2. Two weeks after irradiation the weight increases were almost same in both
irradiated and control groups and in photo analysis, the distance from Mental Foramen
to Incisal tip (Mf-It) was longer than the controls.
Repair processes were taken place in irradiated group, but the cartilagenous layers
wear thinner than the controls.
3. By the third week after exposure further repair was seen in the trabeculae and the
distance from Condylion to Mandibular plane (Cd-Cd') was longer than the controls and
the weight increases were almost same as the controls.
4. At 4 weeks after irradiation the cells of proliferating zone repaired to almost normal
findings, but the cartilagenous cell layers were still thinner than the control animals. In
photo analysis the distances from Menton to Anterior Notch (Me-An), from First Molar
to Mandibular plane (Fm-Fm') were shorter and the weight increases were lesser than
the controls.
5. In the S-100 antibody, the positive cells were increased in number, but decreased
reactivities were seen at the proliferating zone of the irradiated groups.
In the Monoclonal Anti-Proteoglycan antibody and Type I collagen antibody, the
irradiated groups showed little decreased number of positive cells and in the Type II
collagen antibody, the differences between irradiated and control groups were
undetectable in immunohisto-chemical study.

Å°¿öµå

Irradiation; Mandibular condyle; Mandibular growth; Immunohistochemical study.;

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