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Finite-element analysis of the shift in center of resistance of the maxillary dentition in relation to alveolar bone loss

Korean Journal of Orthodontics 2009³â 39±Ç 5È£ p.278 ~ 288
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±¹À±¾Æ ( Kook Yoon-Ah ) - °¡Å縯´ëÇб³ ÀÇ°ú´ëÇÐ ¼­¿ï¼º¸ðº´¿ø ±³Á¤°ú
ÀüÀ±½Ä ( Chun Youn-Sic ) - ÀÌÈ­¿©ÀÚ´ëÇб³ ÀÇ°ú´ëÇÐ Ä¡°úÇб³½Ç ±³Á¤°ú
±è¼ºÈÆ ( Kim Seong-Hun ) - °¡Å縯´ëÇб³ ÀÇ°ú´ëÇÐ ÀÇÁ¤ºÎ¼º¸ðº´¿ø ±³Á¤°ú
¸ð¼º¼­ ( Mo Sung-Seo ) - °¡Å縯´ëÇб³ ÀÇ°ú´ëÇÐ ¼º¸ðº´¿ø ±³Á¤°ú

Abstract

È¿°úÀûÀÎ ±³Á¤Ä¡·á°èȹÀÇ ¼ö¸³À» À§ÇÏ¿© Ä¡¿­±ºÀÇ ÀúÇ×Áß½ÉÀÇ À§Ä¡¿¡ ´ëÇÑ Æò°¡´Â ÇʼöÀûÀÌ´Ù. À̹ø ¿¬±¸ÀÇ ¸ñÀûÀº »ó¾Ç Ä¡¿­±º(4ÀüÄ¡, 6ÀüÄ¡, 14Ä¡¾Æ)¿¡¼­ Ä¡Á¶°ñ ¼Õ½Ç¿¡ µû¸¥ ÀúÇ×Áß½ÉÀÇ À§Ä¡º¯È­¸¦ Á¶»çÇغ¸°íÀÚ ÇÏ¿´´Ù. »ó¾Ç ÀüÄ¡¿­ 14°³ Ä¡¾Æ¿Í Ä¡ÁÖÀÎ´ë ¹× 0 mm, 2 mm, 4 mm ¼Õ½ÇµÈ Ä¡Á¶°ñÀÇ 3Â÷¿ø À¯ÇÑ¿ä¼Ò ¸ðµ¨À» Á¦ÀÛÇÏ¿´°í °¢ Ä¡¾Æ±º(4ÀüÄ¡, 6ÀüÄ¡, 14Ä¡¾Æ)º°·Î Ä¡°üºÎ¸¦ ÇùÃø, ¼³ÃøÈ£¼± ¹× splint wire·Î °íÁ¤ÇÏ¿© Ä¡¾Æ±º ¸ðµ¨À» Á¦ÀÛÇÑ ÈÄ »ó¾Ç ÁßÀýÄ¡ÀÇ Àý´Ü¿¬ ÁßÁ¡¿¡¼­ ¿¬ÀåµÈ splint wire¿¡ 4ÀüÄ¡¿Í 6ÀüÄ¡±º¿¡´Â 200 g, 14Ä¡¾Æ±º¿¡´Â 400 gÀÇ ÈÄ¹æ °ßÀη°ú ¾ÐÇÏ·ÂÀ» Àû¿ëÇÏ¿© ÀúÇ×Áß½ÉÀÇ ¼öÁ÷Àû, ¼öÆòÀû À§Ä¡¸¦ ºÐ¼®ÇÏ¿´´Ù. 4ÀüÄ¡±º¿¡¼­ ÀúÇ×Áß½ÉÀÇ ¼öÁ÷ À§Ä¡´Â Ä¡Á¶°ñ 0 mm, 2 mm, 4 mm ¼Õ½Ç¿¡ µû¶ó ÁßÀýÄ¡ÀÇ Àý´Ü¿¬¿¡¼­ Ä¡±Ù¹æÇâ 13.5 mm, 14.5 mm, 15 mm, ¼öÆò À§Ä¡´Â ÈĹæ 12 mm, 12 mm, 12.5 mm, 6ÀüÄ¡±º¿¡¼­´Â Ä¡±Ù¹æÇâ 13.5 mm, 14.5 mm, 15.5 mm, ÈĹæ 14 mm, 14 mm, 14.5 mm, 14Ä¡¾Æ±º¿¡¼­´Â Ä¡±Ù¹æÇâ 11 mm, 13 mm, 14.5 mm, ÈĹæ 26.5 mm, 27 mm, 25.5 mm¿¡ À§Ä¡ÇÏ¿´´Ù. ¸ðµç Ä¡¾Æ±º¿¡¼­ ÀúÇ×Áß½ÉÀº Ä¡Á¶°ñ ¼Õ½Ç¿¡ µû¶ó Ä¡±Ù÷ ¹æÇâÀ¸·Î À̵¿ÇÏ¿´À¸³ª, Ä¡Á¶Á¤°úÀÇ °Å¸®´Â °¡±î¿öÁ³°í, 4ÀüÄ¡±º°ú 6ÀüÄ¡±º¿¡¼­ ÀúÇ×Áß½ÉÀº Ä¡Á¶°ñ ¼Õ½Ç¿¡ µû¶ó ÈĹæÀ¸·Î À̵¿ÇÏ¿´À¸³ª, 14Ä¡¾Æ±º¿¡¼­´Â Ä¡Á¶°ñ 2 mm ¼Õ½Ç ½Ã¿¡´Â ÈĹæÀ¸·Î À̵¿ÇÏ¿´À¸³ª, 4 mm ¼Õ½Ç ½Ã¿¡´Â Àü¹æÀ¸·Î À̵¿ÇÏ¿´´Ù

Objective: The aim of this study was to investigate the changes in the center of resistance of the maxillary teeth in relation to alveolar bone loss.

Methods: A finite element model, which included the upper dentition and periodontal ligament, was designed according to the amount of bone loss (0 mm, 2 mm, 4 mm). The teeth in each group were fixed with buccal and lingual arch wires and splint wires. Retraction and intrusion forces of 200 g for 4 and 6 anterior teeth groups and 400 g for the full dentition group were applied.

Results: The centers of resistance were at 13.5 mm, 14.5 mm, 15 mm apical and 12 mm, 12 mm, 12.5 mm posterior in the 4 incisor group; 13.5 mm, 14.5 mm, 15 mm apical and 14 mm, 14 mm, 14.5 mm posterior in the 6 anterior teeth group; and 11 mm, 13 mm, 14.5 mm apical and 26.5 mm, 27 mm, 25.5 mm posterior in the full dentition group respectively according to 0 mm, 2 mm, 4 mm bone loss.

Conclusions: The center of resistance shifted apically and posteriorly as alveolar bone loss increased in 4 and 6 anterior teeth groups. However, in the full dentition group, the center of resistance shifted apically and anteriorly in the 4 mm bone loss model.

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À¯ÇÑ¿ä¼ÒÇؼ®; ÀúÇ×Áß½É;;Ä¡Á¶°ñ Èí¼ö; »ó¾Ç ÀüÄ¡¿­±º
Finite element analysis; Center of resistance; Alveolar bone loss; Maxillary full dentition

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