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Early histological change in hard tissue from orthodontic force placed on microscrews in ovariectomized rats

Korean Journal of Orthodontics 2006³â 36±Ç 2È£ p.103 ~ 113
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Abstract

Áß³â ÀÌÈÄÀÇ ¿©¼ºÀÇ °æ¿ì Ä®½· ¼·Ãë°¡ ºÎÁ·Çϰųª, ÀÎÀ§ÀûÀÎ ³­¼Ò ÀûÃ⠶Ǵ Æó°æ µîÀ¸·Î ÀÎÇÏ¿© °ñ¹Ðµµ°¡ °¨¼ÒÇÏ´Â °æÇâÀÌ ÀÖ´Ù. ÀÌ °æ¿ì ±³Á¤ Ä¡·á ½Ã, °ñ³» °íÁ¤¿øÀ¸·Î ¸¶ÀÌÅ©·Î½ºÅ©·ù¸¦ ÀÌ¿ëÇÒ ¼ö ÀÖ´ÂÁö¸¦ ¾Ë¾Æº¸±â À§ÇÏ¿©, »ýÈÄ 4°³¿ù µÈ Sprague-Dawley°è ¹é¼­¸¦ ½ÇÇ豺À¸·Î ³­¼Ò ÀûÃâ(Ovariectomy Screw, OS)±º, ´ëÁ¶±ºÀ¸·Î Sham operation ½ÃÇàÇÑ(Sham operation Screw, SS)±ºÀÇ µÎ ±ºÀ¸·Î ³ª´©¾ú´Ù. OS±º°ú SS±º ¸ðµÎ »ó¾Ç ´ë±¸Ä¡ »çÀÌ ±¸°³°ñ¿¡ ¸¶ÀÌÅ©·Î½ºÅ©·ù¸¦ ½Ä¸³ÇÏ¿´°í, NiTi coil springÀ» ÀÌ¿ëÇÏ¿©, »ó¾Ç ÁßÀýÄ¡ 2°³¸¦ °ßÀÎÇÏ¿´´Ù. °¢ ±º´ç 3ÀÏ, 7ÀÏ ÈÄ 7¸¶¸®¾¿ Èñ»ý½ÃÄ×´Ù. Èñ»ý 3ÀÏÀü Alizarin red S¸¦ ÁÖÀÔÇÏ°í, »ó¾Ç°ñ, Àå°ñ, ½ÉÀåÇ÷À» äµæÇÑ ÈÄ, ½ÉÀåÇ÷À» ¼ººÐºÐ¼®ÇÏ°í, »ó¾Ç°ñ°ú Àå°ñÀº ºñŻȸ ·¹ÁøÇ¥º»À» Á¦ÀÛÇÏ¿©, Æí±¤Çö¹Ì°æ, Çü±¤Çö¹Ì°æÀ¸·Î °üÂûÇÏ¿´´Ù. ½ÉÀåÇ÷À» ÅëÇÑ ¼ººÐ Á¶»ç °á°ú OS±º, SS±º ¸ðµÎ 7ÀÏ° alkaline phosphatase (ALP)ÀÇ ³óµµ°¡ ³ô°Ô ³ªÅ¸³ª °ñ°³Á¶ÀÇ °¡´É¼ºÀ» º¸¿´°í, Æí±¤Çö¹Ì°æ »çÁø¿¡¼­ OS, SS±º¿¡¼­ ¸ðµÎ ¸¶ÀÌÅ©·Î½ºÅ©·ùÀÇ ¾Ð¹ÚÃø, ±äÀåÃø, Ä¡¾ÆÀÇ ±äÀåÃø¿¡¼­ 3ÀÏ º¸´Ù 7ÀÏ¿¡¼­ ±âÁ¸°ñ¿¡ ºñÇÏ¿© °ñ¹Ðµµ°¡ ³·Àº ¿µ¿ªÀÌ Àû¾ú°í, Ä¡¾ÆÀÇ ¾Ð¹ÚÃø¿¡¼­´Â °ñ¹Ðµµ°¡ ³·Àº ¿µ¿ªÀÌ Áõ°¡ÇÏ¿´´Ù. Çü±¤Çö¹Ì°æ °üÂû°á°ú´Â 3ÀÏ° º¸´Ù 7ÀÏ°¿¡ ´õ Alizarin red S·Î ħÂøµÈ °ñÀÌ ³ªÅ¸³­ °ÍÀ¸·Î º¸¾Æ, »õ·Î¿î °ñÀÇ Çü¼ºÀÌ ÀÖ¾úÀ½À» ³ªÅ¸³»¾ú´Ù. °ñ´Ù°øÁõÀÌ À¯µµµÈ ¹é¼­¿¡¼­ °è¼ÓµÈ °ñÀÇ Èí¼öº¸´Ù´Â °ñ°³Á¶ÀÇ °¡´É¼ºÀÌ Áõ°¡ÇÏ°í, ½Å»ý°ñÀÇ Çü¼ºÀÌ Áõ°¡ÇÔÀ» È®ÀÎÇÒ ¼ö ÀÖ¾ú°í, ÀÌ´Â °ñ´Ù°øÁõ¿¡¼­µµ ¸¶ÀÌÅ©·Î½ºÅ©·ùÀÇ ½Ä¸³À¸·Î °íÁ¤¿ø È®º¸°¡ °¡´ÉÇÑ °ÍÀ¸·Î »ý°¢ÇÑ´Ù.

Most elderly women experience a decrease in their bone density due to a deficiency of calcium intake, ovariectomy, or menopause. This study evaluated the usability of the microscrew as a skeletal anchorage system in these orthodontic treatment cases, using rats as a research group. The 4 month old sprague-dawley species rats were divided into two groups, the OS (Ovariectomy Screw), and the SS (Sham operation Screw) group. In both the OS and SS groups, microscrews were implanted into the palatal bone between the upper molar teeth and two upper incisors were retracted using NiTi coil spring with 75g of force. After 3days, the again after 7days, 7rats in each group were sacrificed. Three days before they were sacrificed, Alizarin red S was intraperitoneally injected, and their maxillary bone, tibia and blood from their hearts were taken. The components of the extracted blood were biochemically analyzed and non-decalcified grinding resin sections for maxillary bone and tibia were made. The sections were examined with a polarization microscope, and fluorescent microscope. Smaller concentrations of Ca and P, the inorganic substances closely related to bone density, were found in the extracted blood of the OS group. Both OS and SS groups showed a possibility of bone remodeling with a high concentration of ALP after 7days. An increase in bone density on the tension and compression sides of the microscrew and the tension side of the tooth or both OS and SS groups was confirmed with a polarization microscope. However, the bone density of the pressure side of the tooth and apical side was decreased. More deposits of Alizarin red S in the bone after 7 days rather than 3 days seen with a fluorescent microscope suggested the existence of new bone formation.

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³­¼ÒÀýÁ¦;°ñ´Ù°øÁõ;¸¶ÀÌÅ©·Î½ºÅ©·ù;°ñ°³Á¶;Ovariectomy;Osteoporosis;Microscrew;Bone remodeling

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