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Experimental Study on the Effects of Ovariectomy and Estrogen on the Bone Pattern of Mandible in Rats

Korean Journal of Orthodontics 1999³â 29±Ç 1È£ p.83 ~ 93
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ÀÌÇü¼ø (  ) - ÀüºÏ´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
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È«¼º±Ô (  ) - ÀüºÏ´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­»ýü°úÇבּ¸¼Ò

Abstract

º» ½ÇÇèÀº Æó°æ±â °ñ´Ù°ñÁõ ¿©¼ºÀÇ ±³Á¤Ä¡·á¿¡¼­ ÀϾ ¼ö ÀÖ´Â ÇϾǰñÀÇ ±¸Á¶ÀÇ º¯È­¿Í
¿¡½ºÆ®·ÎÁ¨ Åõ¿© È¿°ú¸¦ ÃßÁ¤Çϱâ À§ÇÑ ¿¬±¸ÀÇ ÀÏȯÀ¸·Î ³­¼Ò¸¦ ÀûÃâÇÑ ±º°ú ¿¡½ºÆ®·ÎÁ¨ Åõ
¿© ¹× ºñÅõ¿©±ºÀ¸·Î ºÐ·ùÇÏ°í ¹Ì¼¼¹æ»ç¼±»çÁøÀ¸·Î ÇϾǰñÀ» ÃÔ¿µÇÏ¿© ÀÌÀÇ °ñ ¸éÀûÀ» ÃøÁ¤
ÇÏ°í Á¶Á÷ º¯È­¸¦ °üÂûÇÏ¿´´Ù. »ýÈÄ 4°³¿ùµÈ Sprauge-Dawley°è ¹é¼­ 50¸¶¸®¸¦ ³­¼ÒÀûÃâ
(OVE)±º, ³­¼ÒÀûÃâÈÄ ¿¡½ºÆ®·ÎÁ¨ Åõ¿©(OVE-EST)±º, sham operation ½ÃÇàÈÄ ¿¡½ºÆ®·ÎÁ¨
Åõ¿©(EST)±ºÀ¸·Î ºÐ·ùÇÏ¿© °¢±ºÀ» ¼ö¼úÈÄ 5ÁÖ, 6ÁÖ, 7ÁÖ° Èñ»ý½ÃÄÑ ÇϾǰñÀ» ÀûÃâÇÑ ÈÄ ÁÂ
Ãø ÇϾǰñÀº ºñŻȸǥº»À¸·Î Á¦ÀÛÇÏ¿© ¹Ì¼¼¹æ»ç¼±»çÁøÀ» ÅëÇØ Çظé°ñÀ» °üÂûÇÏ°í ¸éÀûÀ» Ãø
Á¤ÇÏ¿´À¸¸ç ¿ìÃø ÇϾǰñÀº Żȸǥº»À¸·Î Á¦ÀÛÇÏ¿© º´¸®Á¶Á÷ÇÐÀûÀÎ ¼Ò°ßÀ» °üÂûÇÏ¿© ´ÙÀ½°ú
°°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ÇϾǰñÀÇ Àüü°ñ¸éÀû¿¡ ´ëÇÑ ÇÇÁú°ñÀÇ ºñÀ²ºÐ¼®¿¡¼­ OVE±º, OVE-EST±º, EST±º ¸ðµÎ
¿¡¼­ Åë°èÀûÀ¸·Î À¯ÀÇÇÑ º¯È­°¡ ¾ø¾ú´Ù.
2. OVE±ºÀº ´ëÁ¶±º¿¡ ºñÇØ 5,6,7ÁÖ°·Î °¥¼ö·Ï °ñ¼ö°­ÀÇ ºñÀ²ÀÌ Áõ°¡ÇÏ¿´´Âµ¥(P£¼0.05), ¹é
¼­ÀÇ ³­¼ÒÁ¦°Å°¡ ÇϾǰñ¿¡¼­µµ °ñ¼ÒÁÖ¸¦ ¼Ò½Ç½ÃÄÑ °ñ¼ö°­À» È®Àå½ÃÄ×´Ù.
3. OVE-EST±ºÀº 5ÁÖ°´Â °ñ¼ö°­ÀÇ ºñÀ²ÀÌ ¾à°£ Áõ°¡µÇ¾î ÀÖ¾úÀ¸³ª Á¡Â÷ °¨¼ÒÇÏ¿©¼­ 7ÁÖ
°¿¡ À¯ÀÇÇÏ°Ô Àû¾ú°í(P£¼0.05), EST±ºÀº 6ÁÖ°ºÎÅÍ °ñ¼ö°­ÀÇ ºñÀ²ÀÌ ÇöÀúÈ÷ °¨¼ÒµÇ¾ú´Âµ¥
(P£¼0.05), ¿¡½ºÆ®·ÎÁ¨ÀÌ °ñ¼ö°­ÀÇ Å©±â¸¦ °¨¼Ò½ÃÅ°´Â È¿°ú°¡ ÀÖÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù.
4. ¹Ì¼¼¹æ»ç¼±»çÁø°ú º´¸®Á¶Á÷ÇÐÀû ¼Ò°ß»ó OVE±º¿¡¼­ °ñ¼ö°­µéÀÇ Å©±â°¡ È®ÀåµÇ¾ú°í, ÆÄ°ñ
¼¼Æ÷µéÀÌ ºÒ±ÔÄ¢ÇÑ º¯¿¬ºÎ¿¡¼­ ´Ù¼ö °üÂûµÈ ¹Ý¸é, OVE-EST±ºÀº Á¡Á¡ Ä¡¹ÐÇØÁö´Â °ñ¼ÒÁÖ
µé·Î °ñ¼ö°­ÀÌ ÀÛ¾ÆÁö´Â ¾ç»óÀ» ³ªÅ¸³Â°í, EST±º¿¡¼­´Â dzºÎÇÏ°í Ä¡¹ÐÇÑ °ñ¼ÒÁÖµé·Î °ñ¼ö
°­µéÀÇ Å©±â°¡ ÀÛ¾ÆÁ³´Ù.
#ÃÊ·Ï#
The purpose of this study was to evaluate the changes of cancellous and cortical bone
and the effect of estrogen in ovariectomized rats. Fifty female rats, 250gm in body
weight, were divided into three groups : ovariectomized group(OVE), ovariectomized and
estrogen-injected group(OVE-EST), and sham operated and estrogen-injected
group(EST), Bilateral ovariectomy was performed at the onset of the experiment. In
OVE-EST group and EST group, estrogen was injected 50§¶/§¸ B.W. every other days
from 3 weeks after surgery to sacrifice Each five rats were sacrificed after 5, 6, 7
weeks. One side of mandibular body was radiographed with a soft x-ray apparatus
(Hitex Co., Ltd., Japan). Thereafter the obtained microradiographs were used for the
morphometric analysis using a Image analyzer. The morphometric analysis was
performed for parameters such as total bone area, cortex bone area and medullary one
area. The other side of the mandibular bone was decalcified and embedded in paraffin as
using a general method. The specimens were sectioned and stained with Mallory's
anilline blue and observed light microscopically.
The results were as follows.
1. In all groups, the proportion of cortex to total bone area was not significantly
different.
2. In ovarietomized(OVE) group, the proportion of marrow cavity to medullary bone area
increased significantly from 5 to 7 weeks(p£¼0.05). In ovariectomized and
estrogen-injected (OVE-EST) group, it decreased significantly at 7 weeks, and in
estrogen-injected(EST) group, it decreased significantly from 6 week(p£¼0.05).
3. Microradiogram and histopathologic findings revealed that marrow cavity was
enlarged and osteoclasts were observed around irregular bone surface in OVE group. In
OVE-EST group, the size of marrow cavity at 7 weeks was similar to that of control
group, as dense trabecular bone increased from 5 to 7 weeks, marrow cavity decreased.

Å°¿öµå

³­¼ÒÀûÃâ; ¿¡½ºÆ®·ÎÁ¨; °ñ¼ÒÁÖ; Ovariectomy; Estrogen; cancellous and cortical bone;

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