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The stability in the adolescent Class ¥² malocclusion treated by fixed appliances

Korean Journal of Orthodontics 2004³â 34±Ç 4È£ p.313 ~ 324
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Abstract

º» ¿¬±¸¿¡¼­´Â ¼ºÀå±â °ñ°Ý¼º ¥²±Þ ºÎÁ¤ ±³ÇÕ È¯ÀÚÀÇ Ä¡·á Àü Ãø¸ð µÎºÎ¹æ»ç¼± °èÃø»çÁø¿¡¼­ ¾òÀ» ¼ö ÀÖ´Â °ñ°Ý¼º, Ä¡¼º ºÐ¼®À» ÅëÇÏ¿© ¾ÈÁ¤±º°ú Àç¹ß±ºÀ» ±¸º°ÇÏ¿© ÁÖ´Â ¿ä¼Ò¸¦ ã¾Æ º¸¾Æ ¥²±Þ ºÎÁ¤ ±³ÇÕÀÇ Ä¡·á½Ã ¾ÈÁ¤¼ºÀ» °í·ÁÇÑ Ä¡·á ¼±Åÿ¡ µµ¿òÀ» ÁÖ°íÀÚ ÇÏ¿´´Ù. °íÁ¤½Ä ±³Á¤ ÀåÄ¡¸¦ ÅëÇÑ ÀüÄ¡ºÎ ¹Ý´ë ±³ÇÕ È¤Àº Àý´Ü ±³ÇÕÀÇ °ñ°Ý¼º ¥²±Þ ºÎÁ¤±³ÇÕ Ä¡·á ÈÄ ÃÖ¼Ò 1³â µ¿¾È ¾ÈÁ¤µÈ °á°ú¸¦ º¸ÀÎ ¾ÈÁ¤±º 33¸í°ú °üÂû ±â°£ µ¿¾È Àý´Ü ±³ÇÕ ÀÌÇÏÀÇ ¼öÆò ÇÇ°³¸¦ º¸ÀÎ Àç¹ß±º 22¸íÀ» ¿¬±¸ ´ë»óÀ¸·Î ÇÏ¿© ºñ±³ÇÏ¿´À¸¸ç, t-test¸¦ ½ÃÇàÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. ÀüÈĹæÀû °ñ°Ý Çüź¸´Ù´Â ¼öÁ÷Àû ÇüÅÂ, ƯÈ÷ AB-maxillo-mandibular triangle³»ÀÇ ¼öÁ÷Àû ÇüÅ°¡ ¥²±Þ ºÎÁ¤ ±³ÇÕ Ä¡·áÀÇ ¿¹ÈÄ¿¡ ÁÖ¿äÇÑ °áÁ¤ ÀÎÀÚ·Î ³ªÅ¸³µ´Ù. ¼öÁ÷ °¢µµ °èÃø Ç׸ñ¿¡ ÀÇÇÑ ¾ÈÁ¤±º°ú Àç¹ß±º°£ÀÇ ºñ±³¿¡¼­ À¯ÀǼº ÀÖ´Â Â÷À̸¦ º¸ÀÎ Ç׸ñÀº AB-MP, ODI·Î ³ªÅ¸³µ´Ù(P£¼0.01). ¼öÁ÷ ºñÀ² °èÃø Ç׸ñ¿¡¼­µµ MP-P/AL, PP-P/ALÇ׸ñÀÌ À¯ÀǼº ÀÖ´Â Â÷À̸¦ º¸¿´´Ù(P£¼0.05).
2. Àç¹ßÀÇ °æÇâÀº ±³ÇÕ Æò¸é ƯÈ÷, ÇÏ¾Ç ±³ÇÕ Æò¸éÀÌ ÀüÇϹæÀ¸·Î ±Þ°æ»ç¸¦ ÀÌ·ê¼ö·Ï Áõ°¡Çß´Ù. ±³ÇÕ Æò¸é °æ»çµµ¿Í °ü·ÃµÈ °èÃø Ç׸ñ¿¡ ÀÇÇÑ ¾ÈÁ¤±º°ú Àç¹ß±º°£ÀÇ ºñ±³¿¡¼­ OP(L)-PP, OP-PP, AB-PP(L), Wits appraisal Ç׸ñÀÌ À¯ÀǼº ÀÖ´Â Â÷À̸¦ º¸¿´´Ù(P£¼0.05).
º» ¿¬±¸´Â ÀüÈÄ¹æ ºÎÁ¶È­°¡ ¾Æ´Ñ °ñ°Ý¼º, Ä¡¼º ¼öÁ÷ ºÎÁ¶È­°¡ Àç¹ßÀ» ¿¹ÃøÇÏ´Â ÀûÀýÇÑ ±âÁØÀÌ µÊÀ» ½Ã»çÇÏ¿´´Ù.

The purpose of this study was to investigate the predictors of relapse in orthodontic treatment of skeletal Class ¥² malocclusion in growing patients. A total of 55 patients were studied and all subjects were divided into two groups according to their stability in the post-treatment stage. Of the sample, 33 patients were included in the stable group and the remaining 22 were assigned to the relapse group. Cephalometric data of the pre-treatment stage was taken and compared between the stable and relapse group. The following results were obtained through t-test:
1. This study presented statistical evidence to show that the major skeletal determinant of prognosis in Class ¥² orthodontic treatment was not anteroposterior discrepancy but vertical discrepancy, especially within the AB-maxillo-mandibular triangle. Vertical angular measurements that showed statistically significant differences were AB-NIP and ODI(P£¼0.01) and the vertical ratio measurements were NIP-P/AL and PP-P/AL(P£¼0.05).
2. Relapse tendency increased with the steep occlusal plane, especially the steep lower occlusal plane. As to occlusal plane, there were statistically significant differences in OP(L)-PP, OP-PP, AB-OP(L) and Wits appraisal(P£¼0.05).
This study claimed that anteroposterior discrepancy was not necessarily the proper criteria to predict relapse. Vertical discrepancy had a significant effect on post-treatment stability.

Å°¿öµå

°ñ°Ý¼º ¥²±Þ ºÎÁ¤±³ÇÕ;Àç¹ß;¼öÁ÷ ºÎÁ¶È­;Skeletal Class ¥² malocclusion;Relapse;Vertical discrepancy

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