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Muscle Stiffness and Elasticity of Masticatory Muscles on Gum Chewing

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¿øÅÂÈñ ( Won Tae-Hee ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­³»°úÇб³½Ç
±è¹ÌÀº ( Kim Mee-Eun ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­³»°úÇб³½Ç
±è±â¼® ( Kim Ki-Suk ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­³»°úÇб³½Ç

Abstract

ÃÖ±Ù tactile sensor ¸¦ »ç¿ëÇÏ¿© ±ÙÀ°ÀÇ °æµµ¿Í ź¼ºµµ¸¦ Á¶»çÇÏ´Â ¹æ¹ýÀÌ ÀúÀÛ±ÙÀÇ »õ·Î¿î Æò°¡¹æ¹ýÀ¸·Î Á¦½ÃµÇ°í ÀÖ´Ù. º» ¿¬±¸ÀÇ ¸ñÀûÀº ÃË°¢¼¾¼­¸¦ ÀÌ¿ëÇÏ¿© ÀÏÁ¤½Ã°£ ²­¾Ã±â¸¦ ½ÃÇàÀü, Áß, ÈÄÀÇ ÀúÀÛ±ÙÀÇ °æµµ¿Í ź¼ºµµ¸¦ Á¶»çÇÏ¿© ÇâÈÄ ÅΰüÀý Àå¾Ö ȯÀÚÀÇ ÀúÀÛ±Ù Æò°¡¸¦ À§ÇÑ ±âÃÊÀڷḦ È®º¸ÇÏ´Â µ¥ ÀÖ´Ù.
°Ç°­ÇÑ ¼ºÀÎ 8¸íÀ» ´ë»óÀ¸·Î ¾çÃø ÀüÃøµÎ±Ù(anterior temporalis), Çϱ³±Ù(inferior masseter)ÀÇ °æµµ¿Í ź¼ºµµ¸¦ ÃË°¢¼¾¼­(Venustron ¥±, Axion Co., Japan)¸¦ ÀÌ¿ëÇÏ¿© ´ÙÀ½°ú °°ÀÌ ÃøÁ¤ÇÏ¿´´Ù. ÇÇ°ËÀÚµéÀ» unit-chair¿¡ ¹Ù·Î ¾ÉÈù »óÅ¿¡¼­ ¾çÃø ±³±Ù ¹× ÃøµÎ±Ù ºÎÀ§¸¦ ÃËÁøÀ» ÅëÇØ Àü ÃøµÎ±Ù(temporalis anterior), ÇÏ ±³±Ù(masseter inferior) µÎ ºÎÀ§¸¦ ÆæÀ¸·Î Ç¥½ÃÇÏ¿´´Ù. ½ÇÇèÀÇ ÀçÇö¼ºÀ» À§ÇÏ¿© Åõ¸íÇÑ Á¾ÀÌ¿¡ ala-tragus lineÀ» Ç¥½ÃÇÑ ÈÄ µÎ ºÎÀ§¸¦ Åõ¸íÁ¾ÀÌ À§¿¡ Ç¥½ÃÇÏ¿´´Ù. Æí¾ÈÇÑ »óÅ¿¡¼­ ÃË°¢¼¾¼­¸¦ »ç¿ëÇÏ¿© ¾çÃø ÇÏ ±³±Ù ¹× Àü ÃøµÎ±ÙÀÇ °æµµ¿Í ź¼ºµµ¸¦ ÃøÁ¤ÇÑ ÈÄ, ²­(Excellent Breath, Taiyo Co., Japan)À» ¾çÃøÀ¸·Î ¾Ã°Ô ÇÏ¿© 1ÃÊ´ç 2ȸÀÇ ¼Óµµ·Î ¾Ã°Ô ÇÏ¿´´Ù. ²­À» 40ºÐµ¿¾È ÀúÀÛÇÏ´Â µ¿¾È 10ºÐ, 20ºÐ, 30ºÐ, 40ºÐ¿¡ ¾çÃø ÇÏ ±³±Ù ¹× Àü ÃøµÎ±ÙÀÇ °æµµ¿Í ź¼ºµµ¸¦ ÃøÁ¤ÇÏ¿´´Ù. ±× ÈÄ ²­À» ¹ñ°Ô ÇÏ°í ÇϾÇÀÇ ¾ÈÁ¤À§ »óÅ¿¡¼­ 10ºÐ, 20ºÐ, 30ºÐ, 40ºÐ ÈÄ ¾çÃøÇÏ ±³±Ù ¹× Àü ÃøµÎ±ÙÀÇ °æµµ¿Í ź¼ºµµ¸¦ °¢°¢ ÃøÁ¤ÇÏ¿´´Ù. ÃøÁ¤Ä¡µéÀ» ¹Ýº¹ÃøÁ¤ ÀÌ¿øºÐ»êºÐ¼®°ú ´ÙÁߺñ±³¸¦ ÅëÇÏ¿© ºñ±³ÇÏ¿´´Ù.
½ÇÇè°á°ú ÃøµÎ±Ù°ú ±³±ÙÀ» ºñ±³ ½Ã ź¼ºµµ, °æµµ ¸ðµÎ ±³±ÙÀÇ º¯È­°¡ À¯ÀÇÇÏ°Ô Å©´Ù. ¶ÇÇÑ ÀúÀÛÇÏ¸é ¼­¼­È÷ °æµµ´Â Áõ°¡Çϸç ź¼ºµµ´Â ¹Ý´ë·Î °¨¼ÒÇÑ´Ù. ź¼ºµµ ¹× °æµµ´Â ÀúÀÛ ½Ã ½Å¼ÓÈ÷ Áõ°¡Çϳª ÀúÀÛ Á¾·á ÈÄ¿¡´Â ź¼ºµµ¸¸ ½Å¼ÓÈ÷ ȸº¹µÇ³ª °æµµ´Â ¾à 10ºÐ ÀÌ»óÀÇ ÀÏÁ¤½Ã°£ÀÌ Áö³ª¾ß ȸº¹µÈ´Ù. ÀÌ»óÀÇ °á°úµéÀ» º¸¾Æ ÀÓ»óÀûÀ¸·Î Á» ´õ ´Ù¾çÇÑ ¿¬±¸¿Í ±âÃÊÀÚ·á°¡ È®º¸µÈ´Ù¸é, ÀúÀÛ±ÙÀÇ ±ÙÀ° »óŸ¦ Æò°¡Çϴµ¥, ±ÙÀ°ÀÇ Åº¼ºµµ¿Í °æµµ¸¦ Á¶»çÇÏ´Â tactile sensor systemÀº À¯ÀÍÇÑ ±â±â·Î¼­ È°¿ëµÉ ¼ö ÀÖÀ» °ÍÀÌ´Ù.

Some researchers suggested that tactile sensor system would be useful in evaluating masticatory muscles of TMD patients, but there were few studies on the effects of chewing with time. The aim of this study was to investigate the change of elasticity and stiffness for masseter and temporal muscles of normal subjects before, during and after gum chewing and to obtain the baseline data for further researches on the elasticity and stiffness for masticatory muscles of TMD patients.
Stiffness and elasticity of their anterior temporalis and inferior masseter muscle were measured bilaterally by a tactile sensor system. Each subject was instructed to sit on a chair for evaluation of masticatory muscles. Before operating the sensor, the thickest skin area over anterior temporalis and inferior masseter muscles were selected as the points to be pressed by a tactile sensor, and marked with a pen. While the teeth of subjects were lightly contacted, the probe of the tactile sensor was placed perpendicularly over the marked point over the skin, followed by computer-controlled movement including gently pressing straight down on the muscle for a second and retracting. All subjects were instructed to chew gum (Excellent Breath, Taiyo Co., Japan) bilaterally with a velocity of 2 times per second for 40 minutes after the first measurement had been performed for the baseline data of all subjects. The measurements had been repeated during chewing with 10 minutes of interval and continued for 40 minutes with same interval after chewing. Resultantly, the decrease of elasticity and the increase of stiffness in masticatory muscles can be seen significantly within 10 minutes after chewing and those were maintained during chewing without significant change with chewing time. The elasticity of muscles was recovered within 10 minutes after stopping chewing, but the stiffness was recovered more lately than elasticity by about 10 minutes. Based on these results, it can be concluded that elasticity and stiffness of muscles would be good indicators to evaluate the masticatory muscles objectively, when more supported by further researches.

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²­¾Ã±â;Tactile sensor;°æµµ;ź¼ºµµ;ÀúÀÛ±Ù
Gum chewing;Tactile sensor system;Stiffness; Elasticity;Masticatory muscles

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