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Effect of orthodontic force on the amount of tooth movement and root resorption in rat

Korean Journal of Orthodontics 1999³â 29±Ç 5È£ p.551 ~ 562
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±èÀÏ°ï (  ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
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À±¿µÁÖ (  ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç

Abstract

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¾ç»óÀÇ Â÷ÀÌ°¡ Á¸ÀçÇÏ´Â ÁöÀÇ ¿©ºÎ¿Í Ä¡±ÙÈí¼ö¿ÍÀÇ °ü·Ã ¿©ºÎ¿¡ ´ëÇÏ¿© Æò°¡ÇÏ°íÀÚ ÇÏ¿´´Ù.
300g ÀüÈÄÀÇ °Ç°­ÇÑ ¼öÄÆ ÈòÁã 24¸¶¸®¸¦ ¼¼ ±ºÀ¸·Î ³ª´©°í »ó¾Ç Á¦ 1´ë±¸Ä¡¿Í »ó¾Ç ÁßÀý
Ä¡ »çÀÌ¿¡ NiTi closed coil springÀ» ÀåÂøÇÏ¿©, °¢ ±º´Ü 50g(A±º), 100g(B±º), 25f(C±º)À»
Àû¿ëÇÏ¿´°í C±ºÀÇ °æ¿ì¿¡´Â ±³Á¤·ÂÀ» Àû¿ëÇÑÁö 4ÀÏ° 50gÀ¸·Î ÈûÀ» Áõ°¡ÇÏ¿´´Ù. 15ÀÏ°£ ±³
Á¤·ÂÀ» Àû¿ëÇÏ´Â µ¿¾È ¸ÅÀÏ ehter·Î ÈíÀÔ¸¶Ã븦 ½ÃÇàÇÏ°í Ä¡¾ÆÀ̵¿°Å¸®¸¦ digital caliper·Î
ÃøÁ¤ÇÏ°í 15ÀÏ°£ÀÇ ½ÇÇè±â°£ Á¾·á ÈÄ »ó¾Ç Á¦ 1´ë±¸Ä¡ Ä¡±ÙºÎÀÇ Á¶Á÷Ç¥º»À» Á¦ÀÛÇÏ¿© ±¤ÇÐ
Çö¹Ì°æÀ¸·Î °üÂûÇÑ ¹Ù ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. °¢ ±ºº° 15ÀÏ°£ ÃÑ Ä¡¾ÆÀ̵¿°Å¸®´Â B±º¿¡¼­ °¡Àå ÄÇ°í, ±× ´ÙÀ½ C±º, A±ºÀÇ ¼øÀ̾úÀ¸³ª
Åë°èÇÐÀûÀ¸·Î À¯ÀǼº ÀÖ´Â Â÷ÀÌ´Â ¾ø¾ú´Ù.
2. A, B, C±º ¸ðµÎ ÀüÇüÀûÀÎ Ä¡¾ÆÀÇ À̵¿¾ç»óÀ» º¸¿©ÁÖ¾úÀ¸¸ç Ä¡¾ÆÀ̵¿ Áöü±â°¡ ³¡³­ ³¯Àº
C, B, A±ºÀÇ ¼ø¼­·Î °¢°¢ 7, 8, 9ÀÏ°·Î ³¡³µÀ¸³ª Åë°èÇÐÀûÀ¸·Î À¯ÀǼºÀÖ´Â Â÷ÀÌ´Â ¾ø¾ú´Ù.
3. A, B, C±º ¸ðµÎ¿¡¼­ Ä¡±ÙÀÇ Èí¼ö¾ç»óÀ» °üÂûÇÒ ¼ö ÀÖ¾ú°í, ƯÈ÷ B±º¿¡¼­ °¡Àå ½ÉÇÑ Ä¡±Ù
Èí¼ö¾ç»óÀ» º¸¿©ÁÖ¾ú°í, C±º¿¡¼­ Ä¡±ÙÈí¼öÀÇ ¾ç»óÀÌ °¡Àå Àû¾ú´Ù.
ÀÌ»óÀ» Á¶ÇÕÇغ¼ ¶§, ±³Á¤·ÂÀÌ Å©´Ù°íÇÏ¿© ´õ ºü¸¥ Ä¡¾ÆÀ̵¿ÀÌ ÀϾ´Ù°í º¼ ¼ö ¾øÀ¸¸ç
±³Á¤·ÂÀÌ Å¬¼ö·Ï ÃÊÀھ纯¼º´ë°¡ ±¤¹üÀ§ÇÏ°Ô Çü¼ºµÇ¾î ¿ÀÈ÷·Á Ä¡±ÙÀÇ Èí¼öµµ Áõ°¡ÇϹǷΠ±³
Á¤·ÂÀ» Àû¿ëÇÒ ¶§ Ãʱ⠱³Á¤·ÂÀ» º¸´Ù Àû°Ô Àû¿ëÇÏ¿© ÃÊÀھ纯¼º´ë Çü¼º¹üÀ§¸¦ ÁÙÀÎ µÚ ±³
Á¤·ÂÀ» Áõ°¡½ÃÅ°´Â ¹æ¹ýÀÌ Ä¡±ÙÈí¼ö¸¦ ÃÖ¼ÒÈ­Çϸ鼭 È¿°úÀûÀÎ Ä¡¾ÆÀ̵¿À» ¾òÀ» ¼ö ÀÖÀ» °Í
À¸·Î »ý°¢µÈ´Ù.
#ÃÊ·Ï#
This study was undertaken to investigate the relation between orthodontic force
magnitude and the amount of tooth movement. And more light force application for
reducing root resorption.
Twenty-four rats were divided into three experimental groups(A, B, C) based on force
magnitude and application method. Springs of 50g force were applied to A group, spring
of 100g force were applied to B group and springs of 25g force were applied to C group
initially, and after 4 days springs of C group were changed to springs of 50g force.
Two kinds of sentalloy (GAC U.S.A) closed coil spring, 50g and 100g,
were used. And we made 25g springs by heat treatment process of 50g spring. Each
spring was inserted between the maxillary central incisor and the maxillary left first
molar. Amounts of tooth movement were measured everyday by digital
caliper(Digimatic , Mitutoyo, Japan) under inhalation anesthesia for 15
days, all rats were sacrificed and histological sample were obtained with
Hematoxyline-Eosin stan and Masson's trichrome stain.
Following conclusion were made :
1. Group B showed the mean cumulative tooth movement of 2.19¡¾0.41mm at 15th day,
which was greatest among three groups, followed by group C(2.06¡¾0101mm), group
A(1.90¡¾0.49mm) respectively. However, there was no statistically difference among three
groups.
2. All groups showed general tooth movement pattern and A, B, C group finished lag
phase at 9th, 8th, 7th day, but three was no statistical significance.
3. Group A, B, C showed root resorption and especially group B showed the most
severe root resorption and group C showed milder root resorpting than other groups.
According to the above results, large initial force with the development of a fairly
widespread hyalinized zone may cause severe root resorption, so initial force should be
applied lightly to reduce hyalinized area and eventually root resorption and then
increased force will induce efficient tooth movement.

Å°¿öµå

ÃÖÀû±³Á¤·Â; Ä¡¾ÆÀ̵¿¼Óµµ; Ä¡±ÙÈí¼ö; optimal force; tooth movement rate; root resorption;

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