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STUDY FOR POST-OPERATIVE RELAPSE DIFFERENCE ACCORDING TO THE DEGREE OF THE INTENTIONAL ANTERO-INFERIOR DISLOCATION OF THE MANDIBULAR CONDYLE IN THE BILATERAL SAGITTAL SPLIT RAMI OSTEOTOMY

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Abstract

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1. ¼úÈÄ ÃøÁ¤ÇÑ ¸ðµç Æò±Õ ¼öÄ¡¿¡¼­ Group 1¿¡ ºñÇÏ¿© Group 2, 3¿¡¼­ ´õ¿í´õ ¼úÈÄ À§Ä¡Àû ¾ÈÁ¤¼ºÀ» º¸ÀÓÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.
2. ¼úÈÄ 12°³¿ù¿¡¼­ Group 1¿¡ ºñÇÏ¿© Group 2ÀÇ È¸±âÁö¼ö°¡ Åë°èÀûÀ¸·Î À¯ÀÇÇÒ¸¸Å­ ³·Àº ¼öÄ¡¸¦ º¸¿´´Ù (p<0.001).
3. ¼öÆòȸ±âÁö¼ö »ó¿¡¼­ º¼ ¶§, ¼úÈÄ 12°³¿ù¿¡¼­ Group 2 (p<0.005), 3 (p<0.05)ÀÇ °æ¿ì°¡ Group 1¿¡ ºñÇÏ¿© Åë°èÀûÀ¸·Î À¯ÀÇÇÒ¸¸Å­ ³·Àº ¼öÄ¡¸¦ º¸¿´´Ù.
4. ¼öÁ÷ȸ±âÁö¼ö »ó¿¡¼­ Group 2, 3´Â ¸ðµÎ Group 1¿¡ ºñÇÏ¿© ³·Àº ¼öÄ¡¸¦ º¸¿© ÇϾǰ¢ÀÇ À§Ä¡Àû ¾ÈÁ¤¼ºÀÇ À¯Áö¿¡ À־µµ ¿ì¼öÇÔÀ» º¸¿´´Ù.
±×·¯¹Ç·Î Á¦ÇÑµÈ ¹üÀ§ÀÇ ÇϾǰúµÎÀÇ ÀüÇÏ¹æ º¯À§¹æ¹ýÀº ¼úÈÄ È¸±âÇö»óÀÇ °¨¼Ò¿¡ ±â¿©ÇÔÀ» ¾Ë ¼ö ÀÖ¾ú°í, ¼úÈÄ ÇϾǰ¢ÀÇ º¯È­µµ ÇϾǰúµÎÀÇ º¯À§°¡ ¾ø¾ú´ø ±º¿¡ ºñÇÏ¿© ÀûÀ½À» ¾Ë ¼ö ÀÖ¾ú´Ù.

If condyle was retracted antero-inferiorly intentionally within limit, it would be moved postero-superiorly to acquire the most convenient position of the external pterygoid muscle and capsular ligaments. The purpose of this study was to prove this tendency would reduce post-operative relapse in the class ¥² malocclusion.
52 patients were studied who received BSSRO to correct mandibular prognathism from 1991 to 1994 by the same operator. Follow-up period was limited to post-operative 1 year. In this study, cephalometric lateral view and transcranial TMJ view were used to check the amount of relapse. The groups were divided according to the amount of displacements which were measured to 0.1 §® range. Condylar displacement to any direction within 1.0 §® range after operation was classified as no displacement (Group 1). Condylar displacement more than 1.0 §® after operation was classified as its displacement direction (Group 2 : anteroinferior displacement, Group 3 : inferior displacement). Both the amounts of condylar displacement were averaged. No patients show opposite displacement between condyles after operation. Results was as follows.
1. More post-operative positional stability was seen in the Group 2, 3 than Group 1 in all the index.
2. Group 2 had lower relapse index than Group 1 in the post-operative 12 months significantly (p<0.001).
3. Group 2 (p<0.005) and Group 3 (p<0.05) had lower horizontal relapse index than Group 1 in the post-operative 12 months significantly.
4. Group 2 and Group 3 had more stable than Group 1 in the view of mandibular plane angle changes.
This study showed that some limit of condylar antero-inferior displacement would contribute to prevent post-op relapse phenomenon especially class ¥² malocclusion with or without open-bite.

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