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Effects of the Angulation of Orthodontic Mini-Implant as an Indirect Anchorage : A Three-Dimensional Finite Element Analysis

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±è¹ÎÁö ( Kim Min-Ji ) - ÀÌÈ­¿©ÀÚ´ëÇб³ ÀÇÇÐÀü¹®´ëÇпø Ä¡°úÇб³½Ç
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ÀüÀ±½Ä ( Chun Youn-Sic ) - ÀÌÈ­¿©ÀÚ´ëÇб³ ÀÇÇÐÀü¹®´ëÇпø Ä¡°úÇб³½Ç

Abstract

±¸Ä¡ºÎ °¡À§±³ÇÕÀ» °³¼±Çϱâ À§ÇÑ ¿©·¯ ¹æ¹ý Áß, ±³Á¤¿ë ¹Ì´ÏÀÓÇöõÆ®(OMI)¿Í Á¶ÇÕµÈ Dragon helix¸¦ ÀÌ¿ëÇÑ ¹æ¹ýÀÌ ÀÌÀü¿¡ ¼Ò°³µÈ ¹Ù ÀÖÀ¸¸ç ÀÌ´Â °£Á¢ °ñ¼º°íÁ¤¿øÀÇ ¿ªÇÒÀÌ Áß¿äÇÏ´Ù. ÀÌ¿¡ º» ¿¬±¸¿¡¼­´Â °£Á¢°ñ¼º°íÁ¤¿øÀ¸·Î »ç¿ëµÈ OMIÀÇ ½Ä¸³°¢µµ¿¡ µû¶ó ³ªÅ¸³ª´Â ±¸Ä¡ºÎÀÇ Ä¡±Ù¿¡ ³ªÅ¸³ª´Â ÀÀ·ÂºÐÆ÷¿Í OMIÀÇ Ç¥¸é¿¡¼­ÀÇ ÀÀ·Â ºÐÆ÷ ¹× º¯À§¸¦ À¯ÇÑ¿ä¼Ò Çؼ®À¸·Î ºñ±³ÇÏ°íÀÚ ÇÏ¿´´Ù. »ó¾Ç Á¦1´ë±¸Ä¡¿Í »ó¾Ç Á¦2¼Ò±¸Ä¡ÀÇ Ä¡±Ù »çÀÌ¿¡ OMIÀÇ ½Ä¸³ °¢µµ¸¦ °ñ Ç¥¸é¿¡ ´ëÇÏ¿©, , , À¸·Î º¯È­½ÃÅ°¸é¼­ ÃÖ´ëÀÀ·ÂºÐÆ÷¿Í º¯À§¸¦ °üÂûÇÏ¿´´Ù. OMIÀÇ ½Ä¸³ °¢µµ°¡ ÀÏ ¶§ »ó¾Ç Á¦1´ë±¸Ä¡¿Í »ó¾Ç Á¦2´ë±¸Ä¡ÀÇ ±¸°³ Ä¡±Ù÷¿¡ ÃÖ´ëÀÀ·ÂºÐÆ÷°¡ ³ªÅ¸³µ°í, »ó¾Ç Á¦1´ë±¸Ä¡¿¡¼­´Â ÇùÃøÀ¸·Î º¯À§ÀÇ ¾çÀÌ °¡Àå Àû°Ô ³ªÅ¸³µÀ¸¸ç, »ó¾Ç Á¦2´ë±¸Ä¡¿¡¼­´Â ÇÔÀÔ ¹× ±¸°³ÃøÀ¸·ÎÀÇ º¯À§·®ÀÌ °¡Àå Å©°Ô ³ªÅ¸³µ´Ù. OMI¿¡¼­´Â ½Ä¸³°¢µµ°¡ °¨¼ÒµÊ¿¡ µû¶ó ÃÖ´ë ÀÀ·ÂºÐÆ÷°¡ ³ª»ç÷ ºÎºÐÀ¸·Î À̵¿µÇ¾úÀ¸¸ç, ±×¿¡ µû¶ó OMIÀÇ º¯À§·®Àº Áõ°¡ÇÏ¿´´Ù. ÀÌ»óÀÇ °á°ú·Î OMIÀÇ ½Ä¸³°¢µµ°¡ ÀÏ ¶§ °íÁ¤¿øÀÇ ¿ªÇÒÀÌ ÃÖ´ë°¡ µÇ¾úÀ¸¸ç, ±¸Ä¡ºÎ °¡À§±³ÇÕÀÇ °³¼± È¿°ú°¡ °¡Àå Å©°Ô ³ªÅ¸³²À» ¾Ë ¼ö ÀÖ¾ú´Ù.

The purpose of this study was to investigate the displacement and pattern of stress distribution on periodontal ligaments of maxillary first and second molar, and on orthodontic mini-implant (OMI) surface, according to three different insertion angles to the bone surface of OMI using Dragon helix appliance, which is a newly introduced scissors-bite correcting appliance. OMI were placed between second premolar and first molar with three different insertion angles (45, 60, 90 degrees). Displacement and maximum stress distribution area (MSDA) were analyzed by finite element analysis. When the insertion angle to the alveolar bone surface was 90 degrees, maxillary first and second molar both exhibited MSDA at the palatal root apex. Maxillary first molar did not show any significant displacement, while the second molar exhibited intrusive and palatal displacement. On the OMI, as the insertion angle decreased, the MSDA shifted towards the tip, and the amount of displacement had increased. When the OMI was inserted at a 90 degree angle, anchor loss was minimized and scissors-bite correcting effect was maximized.

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orthodontic mini-implant (OMI);finite element analysis;insertion angulation

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