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the pattern of initial displacement in lingual lever arm traction of 6 maxillary anterior teeth according to different material properties: 3D FEA

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ÃÖÀÎÈ£ (  ) - ´Ü±¹´ëÇб³
Â÷°æ¼® ( Cha Kyung-Suk ) - ´Ü±¹´ëÇб³
Á¤µ¿È­ ( Chung Dong-Hwa ) - ´Ü±¹´ëÇб³

Abstract

ÃÖ±Ù Ä¡·á±â°£ÀÇ ´ÜÃà°ú ½É¹Ì¼ºÀ» µ¿½Ã¿¡ ÃæÁ·½ÃÅ°´Â 6ÀüÄ¡¸¦ ¼³Ãø¿¡¼­ °ßÀÎÇÏ´Â ·¹¹ö¾ÏÀ» ÀÌ¿ëÇÑ °ßÀιæ¹ýÀÌ »ç¿ëµÇ°í ÀÖ´Ù. º» ¿¬±¸¿¡¼­´Â »ó¾Ç°ñÀÇ °íÀüÀûÀÎ 2°¡Áö ¹°¼ºÀ¸·Î ±¸¼ºµÈ À¯ÇÑ ¿ä¼Ò ¸ðµ¨ (´Ü¼ø¸ðµ¨)°ú »õ·ÎÀÌ °³¹ßµÈ 24°¡Áö ¹°¼ºÀ¸·Î ±¸¼ºµÈ ¸ðµ¨ (º¹ÇÕ¸ðµ¨)À» »ý¼ºÇÏ¿© »ó¾Ç 6ÀüÄ¡¸¦ ÈÄ¹æ °ßÀÎ ½Ã, °¢ Ä¡¾Æ¿Í Ä¡ÁÖÀδ뿡 ³ªÅ¸³ª´Â Ãʱâ À̵¿·®°ú ÀÀ·ÂºÐÆ÷¸¦ ºÐ¼®ÇÏ¿´´Ù. 23¼¼ ¼ºÀÎ ³²ÀÚÀÇ CT ÃÔ¿µÀ¸·Î ¾òÀº DICOM ¿µ»óÁ¤º¸¸¦ 3Â÷¿ø ¸®¹ö½º ¿£Áö´Ï¾î¸µ ÄÄÇ»ÅÍ¿µ»óÇÁ·Î±×·¥ Mimics¸¦ ÀÌ¿ëÇÏ¿© »ó¾Ç°ñ ¹× »ó¾Ç ÀüÄ¡ºÎÀÇ 3Â÷¿ø ÀÔü¿µ»ó¸ðµ¨·Î À籸¼ºÇÏ¿© finite element analysis (FEA) ¸ðµ¨À» ¿Ï¼ºÇÏ¿´´Ù. ¸ðµ¨Àº »ó¾Ç°ñ, »ó¾Ç ÀüÄ¡ºÎ °¢ Ä¡¾ÆÀÇ Ä¡ÁÖÀδë, lingual traction armÀÇ ºÎºÐÀ¸·Î ±¸¼ºµÇ¾ú´Ù. »ó¾Ç 6ÀüÄ¡ÀÇ ÀúÇ×Á᫐ ºÎÀ§¸¦ Áö³ªµµ·Ï ±³Çո鿡 ´ëÇÏ¿© ÆòÇàÇÏ°Ô 200gÀÇ ÈĹæ°ßÀηÂÀ» Àû¿ëÇÑ ÈÄ ³ªÅ¸³ª´Â Ãʱâ À̵¿·® ¹× ÀÀ·Â ºÐÆ÷¸¦ 3Â÷¿ø À¯ÇÑ ¿ä¼Ò¹ýÀ» ÀÌ¿ëÇÑ Çؼ®À» ÅëÇØ ºñ±³ÇÏ¿´´Ù. ½ÇÇè °á°ú 24°¡Áö ¹°¼ºÀ¸·Î ±¸¼ºµÈ º¹ÇÕ¸ðµ¨ÀÌ 2°¡Áö ¹°¼ºÀ¸·Î ±¸¼ºµÈ ´Ü¼ø ¸ðµ¨¿¡ ºñÇØ »ó¾Ç ÁßÀýÄ¡¿¡¼­ º¸´Ù ÈĹæ À̵¿µÇ´Â ¾ç»óÀÌ Å©°Ô ³ªÅ¸³µÀ¸¸ç ¼öÁ÷ÀûÀΠȸÀü ¾ç»ó ¿ª½Ã Å©°Ô ³ªÅ¸³µ´Ù. µÎ ¸ðµ¨ ¸ðµÎ ÁßÀýÄ¡¿Í ÃøÀýÄ¡´Â Á¶Àý¼º °æ»çÀ̵¿ÀÇ ÇüÅ·ΠÈĹæÀ̵¿¾çÀÌ °ßÄ¡º¸´Ù Å©°Ô ³ªÅ¸³µÀ¸³ª °ßÄ¡´Â À̵¿·®ÀÌ ÀûÀº ´ë½Å Ä¡±ÙÀÇ À̵¿ÀÌ ´õ Å©°Ô ³ªÅ¸³µ´Ù. ¼öÁ÷Àû À̵¿¾ç»ó¿¡ ÀÖ¾î µÎ ¸ðµ¨ ¸ðµÎ ÃøÀýÄ¡¿Í °ßÄ¡ÀÇ Á¢ÃËÁ¡À» Áß½ÉÀ¸·Î ÀýÄ¡´Â ÇϹæÀ¸·Î °ßÄ¡´Â »ó¹æÀ¸·Î ¿òÁ÷À̴ ȸÀü¾ç»óÀ» ³ªÅ¸³µ´Ù. ÀÀ·ÂÀÇ ºñ±³¿¡¼­´Â ´Ü¼ø ¸ðµ¨°ú º¹ÇÕ ¸ðµ¨¿¡¼­ À¯»çÇÑ °á°ú¸¦ º¸¿´´Ù. ºñ·Ï °¢±â ´Ù¸¥ ¹°¼ºÀ¸·Î ÀÎÇØ ÈĹæ À̵¿·®¿¡¼­´Â Â÷ÀÌ°¡ ³ªÅ¸³µÀ¸³ª ±âº»ÀûÀÎ Ä¡¾ÆÀÇ À̵¿¾ç»óÀº µÎ ¸ðµ¨¿¡¼­ ¸ðµÎ °°°Ô ³ªÅ¸³µ´Ù.

The aim of this study was to analyze the initial movement and the stress distribution of each tooth and periodontal ligament during the lingual lever-arm retraction of 6 maxillary incisors using FEA. Two kinds of finite element models were produced: 2-properties model (simple model) and 24-properties model (multi model) according to the material property assignment. The subject was an adult male of 23 years old. The DICOM images through the CT of the patient were converted into the 3D image model of a skull using the Mimics (version 10.11, Materialise¡¯s interactive Medical Image Control System, Materialise, Belgium). After series of calculating, remeshing, exporting, importing process and volume mesh process was performed, FEA models were produced. FEA models are consisted of maxilla, maxillary central incisor, lateral incisor, canine, periodontal ligaments and lingual traction arm. The boundary conditions fixed the movements of posterior, sagittal and upper part of the model to the directions of X, Y, Z axis respectively. The model was set to be symmetrical to X axis. Through the center of resistance of maxilla complex, a retraction force of 200g was applied horizontally to the occlusal plane. Under this conditions, the initial movements and stress distributions were evaluated by 3D FEA. In the result, the amount of posterior movement was larger in the multi model than in the simple model as well as the amount of vertically rotation. The pattern of the posterior movement in the central incisors and lateral incisors was controlled tipping movement, and the amount was larger than in the canine. But the amount of root movement of the canine was larger than others. The incisor rotated downwardly and the canines upwardly around contact points of lateral incisor and canine in the both models. The values of stress are similar in the both simple and multi model.

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pattern of initial displacement;lingual lever arm traction;3D FEA

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