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Insertion and removal torques according to orthodontic mini-screw design
Â÷Á¤¿, À±Å¹Î, ȲÃæÁÖ,
¼Ò¼Ó »ó¼¼Á¤º¸
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
ȲÃæÁÖ ( Hwang Chung-Ju ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
KMID : 0361920080380010005
Abstract
±³Á¤¿ë ¹Ì´Ï½ºÅ©·ùÀÇ ¿øÃß ÇüÅ°¡ ½Ä¸³ ÈÄ ½Ã±âº° ¾ÈÁ¤¼º¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸±â À§ÇØ, ½Ã±âº° Á¦°Å Åä¿ÀÅ© ¹× µ¿¿äµµ¿Í Á¶Á÷½ÃÆíºÐ¼®À» ½ÃÇàÇÏ¿´´Ù. ¼º°ß 6¸¶¸®ÀÇ ÇÏ¾Ç ÇùÃø°ñ¿¡ ¿øÅëÇü°ú ¿øÃßÇü ±³Á¤¿ë ¹Ì´Ï½ºÅ©·ù (Biomaterials Korea, Seoul, Korea) 48°³¸¦ ½Ä¸³ÇÏ°í, ½Ä¸³ ½Ã ½Ä¸³ Åä¿ÀÅ©¿Í µ¿¿äµµ¸¦ ÃøÁ¤ÇÏ°í 3ÁÖ, 12ÁÖ µ¿¾È ±³Á¤·ÂÀ» ºÎ¿©ÇÑ ÈÄ, Á¦°Å ½Ã Á¦°Å Åä¿ÀÅ©¿Í µ¿¿äµµ¸¦ ÃøÁ¤ÇÏ¿´´Ù. ½Ä¸³ Åä¿ÀÅ©´Â ¿øÅëÇü ¹Ì´Ï½ºÅ©·ù¿¡¼ 13.6 Ncm, ¿øÃßÇü ¹Ì´Ï½ºÅ©·ù¿¡¼ 22.3 Ncm ·Î ¿øÃßÇü ¹Ì´Ï½ºÅ©·ù¿¡¼ ³ôÀº ½Ä¸³ Åä¿ÀÅ©°¡ ÃøÁ¤µÇ¾ú´Ù (p < 0.001). ½Ä¸³ 3ÁÖ° Á¦°Å Åä¿ÀÅ©´Â ¿øÅëÇü ¹Ì´Ï½ºÅ©·ù¿¡¼ 5.7 Ncm, ¿øÃßÇü ¹Ì´Ï½ºÅ©·ù¿¡¼ 9.1 Ncm ·Î À¯ÀÇÇÑ Â÷ÀÌ°¡ °üÂûµÇ¾ú´Ù (p < 0.05). ½Ä¸³ 12ÁÖ° ¿øÃßÇü ¹Ì´Ï½ºÅ©·ùÀÇ Á¦°Å Åä¿ÀÅ©´Â 3.6 Ncm ·Î À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿© (p < 0.05) ¿øÅëÇü ¹Ì´Ï ½ºÅ©·ùÀÇ 4.2 Ncm ¿Í À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù. ÀÌ»óÀÇ °á°ú·Î ¹Ì´Ï½ºÅ©·ùÀÇ ¿øÃß ±¸Á¶´Â ½Ä¸³ Åä¿ÀÅ©¸¦ À¯ÀÇÇÏ°Ô Áõ°¡½ÃÄÑ ½Ä¸³ ÈÄ 3ÁÖ°£ ¾ÈÁ¤¼º¿¡ µµ¿òÀÌ µÇ¾úÀ¸³ª, 12ÁÖ ÈÄ ¾ÈÁ¤¼º¿¡ À־ ¿øÅëÇü ¹Ì´Ï½ºÅ©·ù¿Í À¯»çÇÏ¿´À½À» ½Ã»çÇÑ´Ù.
Objective: This study was designed to analyze the primary and secondary stability characteristics of orthodontic mini-screws of tapered design when compared with the cylinder mini-screw.
Methods: A total of 48 mini-screws were placed into the buccal alveolar bone of the mandible in 6 male beagle dogs. Comparison was made between tapered and cylinder type mini-screws (Biomaterials Korea, Seoul, Korea). Maximum insertion torque (MIT) was measured using a torque sensor (Mark-10, MGT 50, USA) during installation, and maximum removal torque (MRT) was recorded after 3 and 12 weeks of loading.
Results: Taper mini-screws showed a higher MIT value of 22.3 Ncm compared with cylinder mini-screw showing 13.6 Ncm (p < 0.001). The MRT of the taper mini-screw showed a significantly higher value of 9.1 Ncm than those of cylinder mini-screw of 5.7 Ncm at 3-weeks after installation (p < 0.05). However, there was no difference in the MRT value between the taper and cylinder mini-screws at 12 weeks of loading.
Conclusions: These results showed that the high insertion torque of the taper mini-screw design increases initial stability until 3 weeks of loading, but does not have any effect on the secondary stability at 12 weeks of loading.
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Orthodontic mini-screw;Insertion torque;Removal torque
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