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The effect of loading time on the stability of mini-implant

Korean Journal of Orthodontics 2008³â 38±Ç 3È£ p.149 ~ 158
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À̽¿¬ (  ) - ¼Ò¼ÓÈ®ÀÎÁß
Â÷Á¤¿­ ( Cha Jung-Yul ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
À±Å¹Π( Yun Tae-Min ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ¿¹¹æÄ¡°úÇб³½Ç, ±¸°­°úÇבּ¸¼Ò, ±¸°­¾Ç¾È¸é°æÁ¶Á÷Àç»ý¼¾ÅÍ
¹Ú¿µÃ¶ ( Park Young-Chel ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç

Abstract

º» ¿¬±¸´Â ¹Ì´Ï ÀÓÇöõÆ® ½Ä¸³ ÈÄ ±³Á¤·Â ºÎÇϽñâ¿Í °ü·ÃÇÏ¿© ÀÓÇöõÆ® ÁÖÀ§°ñÀÇ Ä¡À¯°úÁ¤À» Á¶»çÇÏ¿´´Ù. ¼º°ß 8¸¶¸®ÀÇ ÇÏ¾Ç ÇùÃø°ñ¿¡ ±³Á¤¿ë ¹Ì´Ï ÀÓÇöõÆ®(ORLUS, Ortholution CO, Korea) 48°³¸¦ ½Ä¸³ÇÑ ÈÄ ±³Á¤·ÂÀ» ÁÖÁö ¾ÊÀº ´ëÁ¶±º°ú ½Ä¸³ ÈÄ Áï½Ã ±³Á¤·ÂÀ» ÁØ Áï½Ã ºÎÇϱº, ±×¸®°í ½Ä¸³ ÈÄ 3ÁÖ°£ÀÇ Ä¡À¯±â°£À» µÎ°í ±³Á¤·ÂÀ» ÁØ Áö¿¬ºÎÇϱºÀ¸·Î ³ª´©¾î °¢°¢ÀÇ ±º¿¡ ´ëÇØ 3ÁÖ, 6ÁÖ, 12ÁÖ°¡ °æ°úµÈ ½ÃÁ¡¿¡ ÀÓÇöõÆ® ÁÖÀ§°ñÀÇ º¯È­¸¦ Á¶Á÷ °èÃøÇÐÀûÀ¸·Î °üÂûÇÏ¿´´Ù. °ñ Á¢ÃË·üÀº Áï½Ã ºÎÇϱº¿¡¼­ ½Ã±â¿¡ µû¸¥ À¯ÀÇÇÑ º¯È­°¡ ¾ø¾úÀ¸¸ç Áö¿¬ ºÎÇϱºÀº 3ÁÖ¿¡ ºñÇØ 12ÁÖ¿¡¼­ À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù (p £¼ 0.05). °¢ ½ÃÁ¡¿¡¼­ ±º °£ÀÇ °ñ Á¢ÃË·üÀ» ºñ±³ÇßÀ» ¶§ 12ÁÖ° Áö¿¬ ºÎÇϱºÀÌ Áï½Ã ºÎÇϱºº¸´Ù À¯ÀÇÇÏ°Ô ³ô¾Ò´Ù (p £¼ 0.05). °ñ ¸éÀûºñÀ²Àº Áï½Ã ºÎÇϱºÀÇ °æ¿ì, ½Ã±â¿¡ µû¸¥ À¯ÀÇÇÑ º¯È­°¡ ¾ø¾úÀ¸¸ç, Áö¿¬ºÎÇϱº°ú ´ëÁ¶±ºÀº 6ÁÖ¿¡ ºñÇØ 12ÁÖ° À¯ÀÇÇÑ Áõ°¡¸¦ º¸¿´À¸¸ç (p £¼ 0.05), 12ÁÖ° ½ÇÇ豺 °£¿¡ À¯ÀÇÇÑ Â÷ÀÌ´Â °üÂûµÇÁö ¾Ê¾Ò´Ù (p £¾ 0.05). µ¿¿äµµ´Â 12ÁÖ° Áï½Ã ºÎÇϱº°ú Áö¿¬ ºÎÇϱº °£¿¡ À¯ÀÇÇÑ Â÷ÀÌ´Â ¾ø¾ú´Ù (p £¾ 0.05). À§ÀÇ °á°ú¿¡¼­ Áï½Ã ºÎÇÏ°¡ self drillingÇü ¹Ì´Ï ÀÓÇöõÆ® ÁÖÀ§°ñÀÇ ¾ÈÁ¤¼º¿¡ ºÎÁ¤ÀûÀÎ ¿µÇâÀ» ÁÖÁö ¾Ê¾ÒÀ¸¹Ç·Î ½Ä¸³ Áï½Ã ±³Á¤·ÂÀ» ºÎ¿©ÇÏ¿© »ç¿ëÇÏ´Â µ¥ ÀÓ»óÀûÀ¸·Î ¹®Á¦°¡ ¾øÀ» °ÍÀ¸·Î ÆǴܵȴÙ. (´ëÄ¡±³Á¤Áö 2008;38(3):149-158)

Objective: The purpose of this study was to investigate the stability of mini-implants in relation to loading time.

Methods: A total of 48 mini-implants (ORLUS, Ortholution, Korea) were placed into the buccal alveolar bone of the mandible in 8 male beagle dogs. Orthodontic force (200 - 250 gm) was applied immediately for the immediate loading group while force application was delayed for 3 weeks in the delayed loading group. For the subsequent loading periods (3, 6, 12 weeks), BIC (bone implant contact) and BV/TV (bone volume/total volume) and mobility test were carried out.
Results: The immediate loading group showed no changes in BIC from 3 to 12 weeks, while the delayed loading group showed a significant increase in BIC between 3 and 12 weeks (p £¼ 0.05). The BV/TV of the delayed loading group significantly increased from 6 to 12 weeks of loading (p £¼ 0.05), while the BV/TV of the immediate loading group decreased from 3 to 12 weeks of loading. However, there was no significant difference in BV/TV between experimental groups. The mobility of the immediate loading group was not significantly different from that of the delayed loading group after 12 weeks of loading (p £¼ 0.05).

Conclusions: These results showed that immediate loading does not have a negative effect on the stability of mini-implants compared to the early loading method in both the clinical and histomorphometric point of view.
(Korean J Orthod 2008;38(3):149-158)

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Mini-implant;Immediateloading;Delayedloading;Histomorphometricanalysis

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