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3-D FEA on the intrusion of mandibular anterior segment using orthodontic miniscrews

Korean Journal of Orthodontics 2011³â 41±Ç 6È£ p.384 ~ 398
¹ÚÇö°æ, ¼ºÀÇÇâ, Á¶¿µ¼ö, ¸ð¼º¼­, ÀüÀ±½Ä, À̱âÁØ,
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¹ÚÇö°æ ( Park Hyun-Kyung ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
¼ºÀÇÇâ ( Sung Eui-Hyang ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
Á¶¿µ¼ö ( Cho Young-Soo ) - ÇѾç´ëÇб³ BK21 ±â°è»ç¾÷´Ü
¸ð¼º¼­ ( Mo Sung-Seo ) - °¡Å縯´ëÇб³ ¼º¸ðº´¿ø Ä¡°ú±³Á¤°ú
ÀüÀ±½Ä ( Chun Youn-Sic ) - ÀÌÈ­¿©ÀÚ´ëÇб³ ¸ñµ¿º´¿ø Ä¡°ú±³Á¤°ú
À̱âÁØ ( Lee Kee-Joon ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç

Abstract

±³Á¤¿ë ¹Ì´Ï½ºÅ©·ù¸¦ ÀÌ¿ëÇÏ¿© ÇÏ¾Ç ÀüÄ¡ÀÇ ÇÔÀÔÀÌ °¡´ÉÇÏ´Ù°í ¾Ë·ÁÁ® ÀÖÀ¸³ª ºÐÀýÀÇ Å©±â¿¡ µû¸¥ ¿¹Ãø°¡´ÉÇÑ À̵¿ ¾ç»ó¿¡ ´ëÇÏ¿© º¸°íµÈ ¹Ù´Â ¹Ì¹ÌÇÏ´Ù. º» ¿¬±¸¿¡¼­´Â ÇÏ¾Ç 4ÀüÄ¡¿Í 6ÀüÄ¡ ºÐÀý ¸ðµ¨¿¡¼­ ¹Ì´Ï½ºÅ©·ù¿Í ÈÅÀÇ À§Ä¡¸¦ ´Þ¸®ÇÏ¿© ÇÔÀÔ·ÂÀ» Àû¿ëÇÏ¿´À» ¶§ ÀÀ·ÂºÐÆ÷¿Í Ãʱ⠺¯À§ ¾ç»óÀ» ºÐ¼®ÇÏ°íÀÚ ÇÏ¾Ç ÀüÄ¡¿Í Ä¡ÁÖÀδë, Ä¡Á¶°ñ¿¡ ´ëÇÑ 3Â÷¿ø À¯ÇÑ¿ä¼Ò ¸ðµ¨À» Á¦ÀÛÇÏ¿© ¹Ì´Ï½ºÅ©·ù ¹× È£¼±»ó ÈÅÀÇ À§Ä¡¿¡ ÀÇÇØ °áÁ¤µÇ´Â Èû º¤ÅÍ¿¡ µû¸¥ Ä¡¾ÆÀÇ 3Â÷¿ø °¢ Æò¸é¿¡¼­ÀÇ º¯À§·® ¹× von Mises ÀÀ·ÂºÐÆ÷ ¾ç»óÀ» ºñ±³ÇÏ¿´´Ù. ÇÏ¾Ç 4ÀüÄ¡ ºÐÀý¿¡¼­´Â ÇÔÀÔ·ÂÀÇ À§Ä¡¿¡ ¹«°üÇÏ°Ô °øÈ÷ Ä¡°üÀÇ Àü¹æ °æ»ç°¡ ¹ß»ýÇÏ¿´À¸¸ç ÃøÀýÄ¡ ¿ø½ÉÀÇ ¹Ì´Ï½ºÅ©·ù¿Í ÈÄÇϹæ ÈûÀ» °¡ÇÑ °æ¿ì °æ»ç Á¤µµ°¡ ÃÖ¼ÒÀÎ °ÍÀ¸·Î ³ªÅ¸³µ´Ù. 6ÀüÄ¡ ºÐÀýÀÇ ÇÔÀÔ ½Ã °ßÄ¡ Àü¹æ¿¡ À§Ä¡ÇÑ ¹Ì´Ï½ºÅ©·ù¿¡ ÀÇÇØ ¿ª½Ã »ó´çÇÑ Ä¡°üÀÇ Àü¹æ °æ»ç ¹× ¼øÃøÄ¡°æºÎ Ä¡±Ù¸·¿¡ von Mises stress°¡ ÁýÁߵǾúÀ¸¸ç °ßÄ¡ ÈĹ濡 À§Ä¡ÇÑ ¹Ì´Ï½ºÅ©·ù¿Í ÁßÀýÄ¡-ÃøÀýÄ¡ °£ ÈÅ¿¡ ÀÇÇÑ Èû¿¡ ÀÇÇØ ¼ø¼öÇÑ ÇÔÀÔ¿¡ °¡±î¿î Ä¡¾Æ º¯À§ ¹× Ä¡±Ù¸· Àüü¿¡ ±ÕÀÏÇÑ von Mises stressÀÇ ºÐÆ÷°¡ °üÂûµÇ¾ú´Ù. ÀÌ·¯ÇÑ °á°ú¸¦ Åä´ë·Î ÇÏ¾Ç ÀüÄ¡ÀÇ ÇÔÀÔÀÌ ¿ä±¸µÇ´Â °ú°³±³ÇÕ Áõ·Ê¿¡¼­ °ßÄ¡ ¿ø½ÉÃøÀÇ ¹Ì´Ï½ºÅ©·ù¿Í ÁßÀýÄ¡-ÃøÀýÄ¡ °£ ÈÅÀ» ÀÌ¿ëÇÑ ÈÄÇϹæ Èû¿¡ ÀÇÇØ ¿¹Ãø°¡´ÉÇÏ°Ô ÇÏ¾Ç 6ÀüÄ¡ÀÇ ¼ø¼öÇÑ ÇÔÀÔÀ» À¯µµÇÒ ¼ö ÀÖÀ» °ÍÀ¸·Î »ý°¢µÈ´Ù.

Objective: The purpose of this study was to analyze the stress distribution and the displacement pattern of mandibular anterior teeth under various intrusive force vectors according to the position of orthodontic miniscrews and hooks, using three-dimensional finite element analysis.

Methods: A three-dimensional finite element model was constructed to simulate mandibular teeth, periodontal ligament, and alveolar bone. The displacement of individual tooth on three-dimensional planes and the von Mises stress distribution were compared when various intrusion force vectors were applied.

Results: Intrusive forces applied to 4 mandibular anterior teeth largely resulted in remarkable labial tipping of the segment according to the miniscrew position. All 6 mandibular anterior teeth were labially tipped and the stress concentrated on the labiogingival area by intrusive force from miniscrews placed mesial to the canine. The distointrusive force vector led to pure intrusion and the stress was evenly distributed in the whole periodontal ligament when the hook was placed between the central and lateral incisors and the miniscrew was placed distal to the canine.

Conclusions: Within the limits of this study, it can be concluded that predictable pure intrusion of the 6 anterior teeth segment may be accomplished using miniscrews placed distal to the canine and hooks located between the central and lateral incisors.

Å°¿öµå

¹Ì´Ï½ºÅ©·ù; 3Â÷¿ø À¯ÇÑ¿ä¼Ò; ÇÏ¾Ç ÀüÄ¡ ÇÔÀÔ; ÀÀ·ÂºÐÆ÷
Miniscrew; Three-dimensional finite element analysis; Mandibular anterior segment intrusion; Stress distribution

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