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AN ELECTROMYOGRAPHIC ANALYSIS OF SOME MASTICATORY MUSCLES IN ANGLE'S CLASS III MALOCCLUSION WITH ACTIVATOR

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Abstract

°á·Ð
Angle¾¾ III±Þ ºÎÁ¤±³ÇÕ¿¡¼­, activator¸¦ ÀåÂø½ÃÄ×À» ¶§ ÀϺΠÀúÀÛ±Ù È°¼ºÀÇ º¯È­¸¦ ±ÙÀüµµ
ÇÐÀûÀ¸·Î ºÐ¼®Çϱâ À§ÇØ 7¼¼¿¡¼­ºÎÅÍ 12¼¼±îÁö (Æò±Õ 8.9¼¼)ÀÇ 13¸íÀÇ ³²ÀھƵ¿°ú 10¸íÀÇ ¿©
ÀÚ ¾Æµ¿À» ´ë»óÀ¸·Î ÇÏ¿©, Ä¡·áÀü, ÀåÄ¡ÀåÂø Á÷ÈÄ, ÀåÄ¡ÀåÂø 20ÀÏ ÈÄ, 3°³¿ù ÈÄ, ÃÖ´ë±³ÇÕ½Ã
ÄÑ ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ÀåÄ¡ÀåÂø Àü, ÃÖ´ë±³Çսà ÀüÃøµÎ±ÙÀÇ È°¼ºµµ´Â À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù.
2. ÀåÄ¡ÀåÂø Á÷ÈÄ, ÃÖ´ë±³Çսà ±³±Ù°ú ÀüÃøµÎ±ÙÀÇ È°¼ºµµ´Â ÀåÂøÀüº¸´Ù À¯ÀÇÇÏ°Ô °¨¼ÒµÇ¾ú
´Ù.
3. ÀåÄ¡ÀåÂø 20ÀÏ ÈÄ, ÃÖ´ë±³Çսà ±³±Ù°ú ÀüÃøµÎ±ÙÀÇ È°¼ºµµ´Â ÀåÂø Á÷Èĺ¸´Ù À¯ÀÇÇÏ°Ô Áõ
°¡µÇ¾úÁö¸¸, ÀåÂøÀüÀÇ ±³±Ù°ú ÃøµÎ±ÙÀÇ È°¼ºµµ¿¡ ºñ±³ÇßÀ» ¶§´Â À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù.
4. ±³±Ù°ú ÀüÃøµÎ±ÙÀ» ºñ±³ÇßÀ» ¶§ ÀåÄ¡ÀåÂø 20ÀÏ ÈÄ ±³±ÙÀÌ À¯¸®ÇÏ°Ô Áõ°¡µÇ¾úÁö¸¸, ÀåÄ¡
ÀåÂø 3°³¿ù ÈÄ¿¡´Â À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù.
#ÃÊ·Ï#
The purpose of the present study was to investigate the influence of activator on EMG
activity of some masticatory muscles in Angle Class III malocclusion. The subjects were
consisted of 23 chidren with class III malocclusion, 13 boys and 10 girls, ranging in age
from 7 to 12 years(mean 8.9 years).
The EMG activity from the anterior temporal and masseter muscles was recorded
during maximal biting in centric occlusion before, immediately after, twenty days and
three months after wearing the activator.
The following results were obtained ;
1. Before wearing the activator, there was no significant difference in EMG activity
between the masseter and anterior temporal muscles.
2. Immediately after wearing the activator, the EMG activity in the masseter and
temporal muscles was markedly reduced.
3. Twenty days after wearing the activator, the EMG activity in the masseter and
temporal muscles was markedly increased compared to that obtained immediately after
wearing the activator and was not significantly different from that obtained before
wearing the activator.
4. The significant difference appeared in EMG activity between the masseter and
anterior temporal muscles after twenty days of wearing the activator, but disappeared
after three months of wearing the activator.

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