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Influence of Preferred Chewing Habit on Electromyographic Activity of Masticatory Muscles and Bite Force

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Abstract

¿À¸¥¼ÕÀâÀÌ¿Í ¿Þ¼ÕÀâÀÌ°¡ ÀÖµíÀÌ ÀúÀÛµµ ÁÖ·Î »ç¿ëÇÏ´Â ÂÊÀÌ ÀÖ´Â ÆíÃøÀúÀÛ½À°üÀÚ¿Í ¾çÂÊÀ» ´Ù »ç¿ëÇÏ´Â ºñÆíÃøÀúÀÛÀÚ°¡ ÀÖ´Ù. º» ¿¬±¸´Â 1³â ÀÌ»ó Áö¼ÓµÈ ÆíÃøÀúÀÛ½À°üÀÌ ÀúÀÛ±Ù°ú ÅΰüÀý¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸°íÀÚ, ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ÀçÇлý ¹× Ä¡°úº´¿ø ±³Á÷¿ø Áß Âü¿©Çϱ⸦ Èñ¸ÁÇÏ´Â ÆíÃøÀúÀÛ½À°üÀÚ 46¸í, ºñÆíÃøÀúÀÛ½À°üÀÚ 36¸í, ÃÑ 82¸íÀÇ Áö¿øÀÚ¸¦ ´ë»óÀ¸·Î ÀúÀÛ±ÙÀÇ ±ÙÈ°¼ºµµ¿Í ±³ÇÕ·ÂÀ» °Ë»çÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. ¿¬±¸¿¡ ¾Õ¼­ ¼³¹® ¹× ÀÓ»ó°Ë»ç¸¦ ÅëÇÏ¿© ¿¬±¸¿¡ ¿µÇâÀ» ³¢Ä¥ ¼ö Àִ Ư±âÇÒ Àü½Åº´·ÂÀ̳ª ºÒ±ÔÄ¢ÇÑ Ä¡¿­ ¹× ºñÁ¤»óÀûÀÎ ±³ÇÕÀ» °¡Áø ÀÚ´Â ¹èÁ¦ÇÏ¿´´Ù.
1. ÆíÃøÀúÀÛ½À°üÀÚ±º¿¡¼­ ¾ÈÁ¤À§¿Í ÃÖ´ë À̾ǹ°±â(maximal voluntry contraction; MVC)»óÅ¿¡¼­ÀÇ ÀúÀÛÃø°ú ºñÀúÀÛÃø°£ ±ÙÈ°¼ºµµ´Â Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù (p>0.05).
2. ¾ÈÁ¤À§ ½Ã ÀüÃøµÎ±Ù°ú ±³±Ù¿¡¼­ÀÇ ±ÙÈ°¼ºµµ ºñ´ëĪ Áö¼ö´Â ÆíÃøÀúÀÛ½À°üÀÚ±º°ú ºñÆíÃøÀúÀÛ½À°üÀÚ±º »çÀÌ¿¡ Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù(p>0.05).
3. ÃÖ´ë À̾ǹ°±â ½Ã ±³±ÙÀÇ ±ÙÈ°¼ºµµ ºñ´ëĪ Áö¼ö´Â ÆíÃøÀúÀÛ½À°üÀÚ±º¿¡¼­ ºñÆíÃøÀúÀÛ½À°üÀÚ±º º¸´Ù ³ô°Ô ³ªÅ¸³µÀ¸¸ç(p≶0.05), ÀüÃøµÎ±ÙÀÇ ±ÙÈ°¼ºµµ ºñ´ëĪ Áö¼ö´Â ÆíÃøÀúÀÛ½À°üÀÚ±º°ú ºñÆíÃøÀúÀÛ½À°üÀÚ±º°£¿¡ Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù(p>0.05).
4. ÆíÃøÀúÀÛ½À°üÀÚ±º¿¡¼­ ÀúÀÛÃø°ú ºñÀúÀÛÃø°£ÀÇ Æò±Õ±³Çշ°ú ±³ÇÕÁ¢Ã˸éÀûÀº Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù(p>0.05).
5. ÆíÃøÀúÀÛ½À°üÀÚ±º°ú ºñÆíÃøÀúÀÛ½À°üÀÚ±º°£ÀÇ Æò±Õ±³ÇÕ·ÂÀÇ ºñ´ëĪ Áö¼ö¿Í ±³ÇÕÁ¢Ã˸éÀûÀÇ ºñ´ëĪ Áö¼ö´Â Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù(p>0.05).
ÀÌ»óÀÇ ¿¬±¸°á°ú ÆíÃøÀúÀÛ½À°üÀº ÀúÀÛ±ÙÀÇ ±ÙÈ°¼ºµµ¿Í Æò±Õ±³ÇÕ·Â ¹× ±³ÇÕÁ¢Ã˸éÀû¿¡ ¿µÇâÀ» ¹ÌÃÄ º¯È­¸¦ ÀÏÀ¸Å°±â º¸´Ù´Â, Á¤»óÀûÀÎ ±â´ÉÀ» ÇÏ´Â »ý¸®Àû ºñ´ëĪÀ̶ó°í º¸´Â °ÍÀÌ Å¸´çÇÏ´Ù°í »ý°¢ÇÑ´Ù. ÇâÈÄ ¿¬±¸ ½Ã ÆíÃøÀúÀÛÀÚ¿Í ºñÆíÃøÀúÀÛÀÚ¸¦ ±¸ºÐÇϱâÀ§ÇÑ °´°üÀûÀÎ ±âÁØÀÇ Á¦½Ã°¡ ÇÊ¿äÇÏ´Ù°í »ý°¢ÇÑ´Ù.

As people prefer to use right or left hand, some have preferred chewing side while others do not. Totally, 82 volunteers composed of students and staffs from Dental Hospital College of Dentistry Yonsei University participated in this study for the investigation of influence of preferred chewing habit, that has lasted for more than a year, on electromyographic(EMG) activity of masticatory muscles and bite force. Among the 82 volunteers, 46 had preferred chewing habit while the other 36 did not. Prior to the investigation, those with factors that could affect the study, such as, general disease, irregular dentition and malocclusion, were screened and excluded by questionnaire and clinical examination. The results were as follows:
1. There was no significant difference in EMG activities between chewing side and non-chewing side of preferred chewing subjects at rest as well as maximal voluntary contraction(MCV)(p>0.05).
2. Asymmetrical coefficient of temporal and masseter muscle EMG activities between preferred chewing subjects and non-preferred chewing subjects at rest was not significantly different(p>0.05).
3. Asymmetrical coefficient of masseter EMG activity was significantly higher(p≶0.05) than that of non-preferred chewing subjects at MCV, whereas that of anterior temporal muscle showed no difference(p≶0.05).
4. In preferred chewing subjects, there was no significant difference in average bite force and occlusal contact area between chewing side and non-chewing side(p>0.05).
5. There was no significant difference in Asymmetrical coefficients of average bite force and occlusal contact area between preferred chewing subjects and non-preferred chewing subjects (p>0.05).
Consequently, preferred chewing habit can be considered as physiological asymmetry with normal function rather than to have influence on EMG muscle activity of masticatory muscles, average bite force and occlusal contact area. Objective standardization to differentiate preferred chewing subjects and non-preferred chewing subjects should be established in the further study.

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