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Factors affecting force system of orthodontic loop spring

Korean Journal of Orthodontics 1999³â 29±Ç 5È£ p.511 ~ 520
¼Ò¼Ó »ó¼¼Á¤º¸
ÃÖ±¤Ã¶/Kwang Chul Choy ±è°æÈ£/¹Ú¿µÃ¶/Kyung Ho Kim/Young Chel Park

Abstract

»ý¿ªÇÐÀûÀ¸·Î ¿ì¼öÇÑ ½ºÇÁ¸µÀ» ¼³°èÇϱâ À§Çؼ­ ½ºÇÁ¸µÀÇ ÇüÅ¿¡ ¿©·¯ °¡Áö º¯È­¸¦ ÁÖ¸é
¼­ °¢ »óȲ¿¡¼­ force systemÀÌ º¯ÇÏ´Â ¾ç»óÀ» ¼öÄ¡ºÐ¼®°è»ê°ú spring tester¸¦ ÀÌ¿ëÇÑ ½ÇÇè
°ú ºñ±³ÇÏ¿´´Ù. ÁÖ¾îÁø ÇغÎÇÐÀûÀÎ ÇÑ°è ³»¿¡¼­ ÃÖ´ëÇÑ »ý¿ªÇÐÀû È¿À²À» ³ôÀÌ´Â ¿ä¼ÒµéÀ»
Á¦½ÃÇÏ¿´´Ù.
1. ½ºÇÁ¸µÀÇ ³ôÀÌ°¡ Áõ°¡Çϸé M/F ratio´Â Áõ°¡ÇÏ°í L/D rateÀº °¨¼ÒÇÑ´Ù.
2. ½ºÇÁ¸µÀÇ ÃÖ¼Ò ±ÁÈû ¸ð¸àÆ® ºÎÀ§º¸´Ù À§¿¡ wire¸¦ ÷°¡Çϸé M/F ratio´Â Áõ°¡ÇÏ°í L/D
rateÀº °¨¼ÒÇÑ´Ù.
3. ½ºÇÁ¸µÀÇ ÃÖ¼Ò ±ÁÈû ¸ð¸àÆ® ºÎÀ§º¸´Ù ¾Æ·¡¿¡ wire¸¦ ÷°¡Çϸé M/F ratio´Â °¨¼ÒÇÏ°í
L/D rate´Â Áõ°¡ÇÑ´Ù.
4. ½ºÇÁ¸µÀÇ À§ÂÊ¿¡ ¾Æ¹«¸® wire¸¦ ¸¹ÀÌ Ã·°¡ÇÏ¿©µµ ½ºÇÁ¸µÀÇ ³ôÀÌ ÀÌ»óÀÇ M/F ratio´Â ¾ò
À» ¼ö ¾ø´Ù.
5. Á¦ÇÑµÈ ³ôÀÌÀÇ ½ºÇÁ¸µÀ¸·Î ÃæºÐÇÑ M/F ratio¸¦ ¾ò±â À§Çؼ­´Â ºÎ°¡ÀûÀÎ ¸ð¸àÆ®°¡ ÇÊ¿äÇÏ
´Ù.
6. ½ºÇÁ¸µÀÇ ¼öÆò ±æÀÌ°¡ Áõ°¡ÇÒ¼ö·Ï M/F ratio¿Í L/D rate´Â °¨¼ÒÇϹǷΠºÎ°¡ÀûÀÎ ¸ð¸àÆ®
´Â Á¡Á¡ °¢µµ°¡ Áõ°¡ÇÒ ¼ö ÀÖµµ·Ï ½ºÇÁ¸µ Àüü¿¡ ºÎ¿©ÇÒ ÇÊ¿ä°¡ ÀÖ´Ù.
7. L/D rate´Â Àç·á, ´Ù¸é, ±×¸®°í ÇüÅ¿¡ ¿µÇâÀ» ¹ÞÁö¸¸ M/F ratio´Â Àç·á³ª ´Ü¸é¿¡ °ü°è¾ø
ÀÌ ½ºÇÁ¸µÀÇ ÇüÅ¿¡¸¸ ¿µÇâÀ» ¹Þ´Â´Ù.
#ÃÊ·Ï#
The shape of orthodontic retraction spring was varied and force system of each case
was obtained using numerical analysis and verified with spring tester. The factors for
obtaining biomechanically efficient spring under anatomic limitation were suggested as
follows.
1. M/F ratio increases and L/D rate decreases as loop height increases.
2. M/F ratio increases and L/D rate decreases as incorporating more wire above bending
moment area.
3. M/F ratio decreases and L/D rate decrease as incorporating more wire above bending
moment area.
4. M/F ratio can not be greater than spring height no matter how much wire is
incorporated at the apex of the loop.
5. Additional moment is necessary to obtain enough M/F ratio for translation under
anatomical limitation.
6. Additional moment should be incorporated at every part of the spring because M/F
ratio and L/D rate decreases as horizontal spring length increases.
7. Material, cross section, and shape of the spring influence L/D rate, whereas M/F ratio
is influenced by the shape of the spring independent from material and cross section.

Å°¿öµå

»ý¿ªÇÐ; L/D rate; M/F ratio; °ßÀÎ¿ë ½ºÇÁ¸µ; biomechanics; L/D rate; M/F ratio; retraction spring;

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SCI(E)
KCI
KoreaMed