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Spatial changes of the upper dentition following en-masse space closure A comparison between first and second premolar extraction

Korean Journal of Orthodontics 2005³â 35±Ç 5È£ p.371 ~ 380
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Abstract

Á¦1¼Ò±¸Ä¡ ¶Ç´Â Á¦2¼Ò±¸Ä¡ ¹ßÄ¡ ÈÄ ¹ßÄ¡°ø°£ Æó¼â ½Ã Ä¡¾ÆÀ̵¿ÀÇ ¾ç»ó Áï, Ä¡¾ÆÀ̵¿¹æÇâ°ú À̵¿·®À» ±¸¸íÇÏ´Â °ÍÀÌ º» ¿¬±¸ÀÇ ¸ñÀûÀ̾ú´Ù. »ó¾Ç ¿ìÃø Àΰø Ä¡Á¶°ñºÎ¿¡ Á¦1¼Ò±¸Ä¡ ¶Ç´Â Á¦2¼Ò±¸Ä¡¸¦ Á¦¿ÜÇÑ ÁßÀýÄ¡ºÎÅÍ Á¦2´ë±¸Ä¡±îÁö ½ÇÇè¿ë Ä¡¾ÆµéÀ» ½Ä¸³ÇÏ°í bull loopÀÌ Çü¼ºµÈ ¹ÝÂÊ È£¼±¿¡ 15µµÀÇ gable bend¸¦ ºÎ¿©ÇÑ ÈÄ ÀüÄ¡ºÎ¸¦ ÈĹæ°ßÀÎÇÏ¿© ¹ßÄ¡°ø°£À» Æó¼â½ÃÄ×´Ù. ½ÇÇè ÀüÈÄ¿¡ ±³ÇÕ¸é ¹æ»ç¼±»çÁø°ú ½Ã»ó¸í ¹æ»ç¼±»çÁøÀ» ÃÔ¿µÇÏ°í ÀΰøÄ¡Á¶°ñºÎ ÇÏ´Ü¿¡ ½Ä¸³µÈ ±âÁØÇ¥ÁöÁ¡¿¡ ÁßøÇÏ¿© À̵¿¹æÇâ ¹× À̵¿·®À» °èÃøÇÏ¿´´Ù. ±× °á°ú Á¦2¼Ò±¸Ä¡ ¹ßÄ¡±ºÀÇ ÀüÄ¡ºÎ ÈĹæÀ̵¿·®ÀÌ Á¦1¼Ò±¸Ä¡ ¹ßÄ¡±º¿¡ ºñÇØ ´õ Àû¾úÀ¸¸ç ±¸Ä¡ºÎÀÇ °íÁ¤¿ø ¼Ò½Ç ¹× °íÁ¤¿øÀÇ ±Ù½É¼³ÃøȸÀü·®Àº Á¦2¼Ò±¸Ä¡ ¹ßÄ¡±º¿¡¼­ ´õ Å©°Ô ³ªÅ¸³µ´Ù.

The purpose of this experimental study was to evaluate and compare maxillary arch dimensional and positional changes between first and second premolar extraction groups. The Calorific Machine was used to illustrate tooth movement in three dimensions. The experimental teeth except the first or second premolars were embedded in artificial alveolar bone. The extraction space was closed using arch wires with bull loops into which 15 degree gable bends were placed. Before and after space closure. radiographs were taken in the sagittal and occlusal directions using occlusal films. The results showed greater mean maxillary incisor retraction and less anchorage loss in the maxillary first premolar extraction group than in the maxillary second premolar extraction group. Mesiopalatal rotation of anchor teeth was greater after extraction of a maxillary second premolar than a maxillary first premolar (p<.001).

Å°¿öµå

¼Ò±¸Ä¡¹ßÄ¡;¹ßÄ¡°ø°£Æó¼â;°ßÀηçÇÁ;Ä¡¾ÆȸÀü;Premolar extraction;Space closure;Bull loop;Rotation

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SCI(E)
KCI
KoreaMed