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The Long-Term Stability of the Lower Incisor Axis in Class ¥± division 2 Malocclusions

Korean Journal of Orthodontics 2004³â 34±Ç 6È£ p.497 ~ 505
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ÃÖ¿øö/Choi WC ±èÅ¿ì/Kim TW

Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº Á¦¥±±Þ 2·ù ºÎÁ¤±³ÇÕ¿¡¼­ ÇÏ¾Ç ÀýÄ¡ Ä¡ÃàÀÇ º¸Á¤ ÀÌÈÄ ¾ÈÁ¤¼ºÀ» Æò°¡ÇÏ´Â °ÍÀÌ´Ù. 62¸íÀÇ Á¦¥±±Þ 2·ù ºÎÁ¤±³ÇÕ Áõ·Êµé¿¡¼­ ±³Á¤ Ä¡·áÀü(T1)°ú Ä¡·áÈÄ(T2) ±×¸®°í Àå±â°£ÀÇ º¸Á¤ ÀÌÈÄ(T3)ÀÇ Ä¡¾Æ ¸ðÇü°ú Ãø¸ð µÎºÎ ¹æ»ç¼± »çÁøµéÀ» ÀÌ ¿¬±¸¿¡ »ç¿ëÇÏ¿´´Ù. °¢ ½Ã±âº°·Î ¿©·¯ °³ÀÇ ¼± ¹× °¢µµ °èÃøÀ» ½ÃÇàÇÏ°í °¢ ¼ºº°°ú ¹ßÄ¡-ºñ¹ßÄ¡¿¡ ´ëÇÑ ÇÏ¾Ç ÀýÄ¡ Ä¡Ãà º¯È­·®ÀÇ À¯ÀǼºÀ» Æò°¡ÇÏ¿´´Ù. ±× °á°ú, Á¦¥±±Þ 2·ù ºÎÁ¤±³ÇÕ Ä¡·á µ¿¾È ¼øÃøÀ¸·Î °æ»çµÈ ÇÏ¾Ç ÀýÄ¡µéÀº ºÒ¾ÈÁ¤ÇÏ¿´°í ¿ø·¡ÀÇ ¼³Ãø À§Ä¡·Î µÇµ¹¾Æ °¬´Ù(p£¼0.001). ÇÏ¾Ç ÀýÄ¡µéÀÇ ¼³Ãø Àç¹ß·®¿¡ ´ëÇÏ¿©´Â ¹ßÄ¡¿Í ºñ¹ßÄ¡±º »çÀÌ¿¡ À¯ÀÇÇÑ Â÷ÀÌ´Â ¾ø¾ú´Ù(p£¾0.05). ÇÏ¾Ç ÀýÄ¡µéÀÇ Ãຯȭ¿¡ ´ëÇÏ¿©´Â ³²³à±º »çÀÌ¿¡ À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù(p£¾0.05). ´ÙÁß È¸±Í ºÐ¼®ÀÇ °á°ú, º¸Á¤ ÀÌÈÄ A-Pog¼±¿¡ ´ëÇÑ ÇÏ¾Ç ÀýÄ¡ÀÇ À§Ä¡¸¦ °¡Àå Àß ¿¹ÃøÇÏ´Â µÎºÎ°èÃø ¹æ»ç¼± °èÃø Ç׸ñÀº Ä¡·áÀü L1-Apog(mm)°ú Ä¡·áÀü SNCoMe(¢ª)¿´´Ù.
±³Á¤ Ä¡·á ÀÌÈÄ ¼øÃøÀ¸·Î °æ»çµÈ ÇÏ¾Ç ÀýÄ¡µéÀÇ ºÒ¾ÈÁ¤¼º ¶§¹®¿¡ Ä¡·á ¸ñÇ¥´Â Ä¡·áÀü ÀýÄ¡ Ä¡ÃàÀÇ À§Ä¡°¡ µÇ¾î¾ß ÇÑ´Ù.

The purpose of this study was to evaluate the post-retention stability of the lower incisor axis in Class ¥± division 2 malocclusions. The dental casts and lateral cephalograms from before (T1) and after (T2) orthodontic treatment and long-term post-retention (T3) in 62 Class ¥± division 2 malocclusion cases were included in this study. After several linear and angular measurements at each time were taken, the significance in the amount of change of the lower incisor axis for each gender and extraction versus non-extraction was evaluated. The results showed that the lower incisors that inclined labially during treatment were unstable and relapsed to the original lingual position in Class ¥± division 2 malocclusions (p£¼0.001). There was no significant difference between extraction and non-extraction groups for the amount of lingual relapse of the lower incisors (p£¾0.05). There was no significant difference between male and female groups for the axial change of the lower incisors (p£¾0.05). As a result of multiple regression analysis, the cephalometric measurement best predicting the lower incisor position to the A-Pog line post-retention was pre-treatment L1-Apog(mm) and pre-treatment SNGoMe(¢ª).
Because of the instability of labially inclined lower incisors after orthodontic treatment, the treatment goal should be the pre-treatment incisor axial position.

Å°¿öµå

Stability;Lower incisor axis;Class ¥± division 2 malocclusion;¾ÈÁ¤¼º;ÇϾÇÀýÄ¡Ä¡Ãà;Á¦¥±±Þ 2·ù ºÎÁ¤±³ÇÕ

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