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Effect of dual pitch mini-implant design and diameter of an orthodontic mini-implant on the insertion and removal torque

Korean Journal of Orthodontics 2006³â 36±Ç 4È£ p.275 ~ 283
±èÁ¾¿Ï, Á¶ÀϽÄ, À̽ÅÀç, ±èÅ¿ì, À念ÀÏ,
¼Ò¼Ó »ó¼¼Á¤º¸
±èÁ¾¿Ï ( Kim Jong-Wan ) - ºÐ´ç¼­¿ï´ëÇб³º´¿ø Ä¡°ú
Á¶ÀϽĠ( Cho Il-Sik ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
À̽ÅÀç ( Lee Shin-Jae ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú±³Á¤Çб³½Ç
±èÅ¿ì ( Kim Tae-Woo ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú±³Á¤Çб³½Ç
À念ÀÏ ( Chang Yong-Il ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú±³Á¤Çб³½Ç

Abstract

ÀÛÀº Å©±âÀÇ ±³Á¤¿ë ¹Ì´ÏÀÓÇ÷£Æ®´Â ±³Á¤Àû °íÁ¤¿øÀ¸·Î ³Î¸® ÀÌ¿ëµÇ°í ÀÖ´Ù. ±×·¯³ª ºó¹øÈ÷ Å»¶ôÇÏ´Â ´ÜÁ¡ÀÌ ÀÖ¾î À̸¦ °³¼±Çϱâ À§ÇØ ¾ÈÁ¤¼ºÀ» Çâ»ó½ÃÅ°±â À§ÇÑ ´Ù¾çÇÑ ¿¬±¸°¡ ½ÃµµµÇ¾î ¿Ô´Ù. ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº ÀÌÁß ÇÇÄ¡¿Í Á÷°æ¿¡ °ü·ÃÇÏ¿© ¹Ì´ÏÀÓÇ÷£Æ®ÀÇ ¾ÈÁ¤¼º¿¡ ´ëÇÑ ±â°èÀû ¼ºÁúÀ» ºñ±³ ºÐ¼®ÇÏ´Â °ÍÀÌ´Ù. ¹Ì´ÏÀÓÇ÷£Æ®ÀÇ ±æÀÌ´Â 8 mm¿´À¸¸ç, ÇÇÄ¡´Â ´ÜÀÏ ÇÇÄ¡Çü°ú ÀÌÁß ÇÇÄ¡Çü, Á÷°æÀº 1.4 mm¿Í 1.6 mm·Î ´ÜÀÏ ÇÇÄ¡Çü 1.4 mm, ´ÜÀÏ ÇÇÄ¡Çü 1.6 mm, ÀÌÁß ÇÇÄ¡Çü 1.4 mm, ÀÌÁß ÇÇÄ¡Çü 1.6 mm µî ÃÑ 4±ºÀ¸·Î ±¸¼ºµÇ¾ú´Ù. °¢ ±ºÀº 20°³ÀÇ ¹Ì´ÏÀÓÇ÷£Æ®·Î ±¸¼ºµÇ¾ú°í, ±ÕÀÏÇÑ ¹ÐµµÀÇ polyurethane foam¿¡ »ðÀÔ ÈÄ Á¦°ÅÇÏ¿´´Ù. ½Ã°£¿¡ µû¸¥ »ðÀÔ ¹× Á¦°Å ÅäÅ©ÀÇ º¯È­¿Í °¢°¢ÀÇ ÃÖ´ë ÅäÅ© µîÀ» ÃøÁ¤ÇÏ¿© ±â°èÀû ¼ºÁúÀ» ºñ±³ ºÐ¼®ÇÏ¿´´Ù. ÀÌÁß ÇÇÄ¡ÇüÀº ´ÜÀÏ ÇÇÄ¡Çüº¸´Ù À¯ÀǼº ÀÖ°Ô ´õ ³·Àº ÃÖ´ë »ðÀÔ ÅäÅ©¿Í ´õ Å« ÃÖ´ë Á¦°Å ÅäÅ©¸¦ º¸¿©ÁÖ¾ú´Ù. Á÷°æ 1.6 mm´Â 1.4 mmº¸´Ù À¯ÀǼº ÀÖ°Ô ´õ Å« ÃÖ´ë »ðÀÔ ÅäÅ©¿Í ÃÖ´ë Á¦°Å ÅäÅ©¸¦ º¸¿©ÁÖ¾ú´Ù. ÀÌÁß ÇÇÄ¡Çü 1.4 mm±ºÀº »ðÀÔ ½Ã¿¡´Â À¯ÀǼº ÀÖ°Ô °¡Àå ³·Àº ÃÖ´ë »ðÀÔ ÅäÅ©¸¦ º¸¿©ÁÖ¾úÀ¸¸ç Á¦°Å ½Ã¿¡´Â ´ÜÀÏ ÇÇÄ¡Çü 1.6 mm±ºº¸´Ù ³ô°Å³ª ºñ½ÁÇÑ ÃÖ´ë Á¦°Å ÅäÅ©¸¦ º¸¿©ÁÖ¾ú´Ù. ƯÈ÷, ÀÌÁß ÇÇÄ¡Çü±ºÀº ÃÖ´ë Á¦°Å ÅäÅ© ÈÄ Áö¼ÓÀûÀ¸·Î ³ôÀº Á¦°Å ÅäÅ©¸¦ º¸¿©ÁÖ¾ú´Ù. ¹Ì´ÏÀÓÇ÷£Æ®ÀÇ ±â°èÀû ¾ÈÁ¤¼ºÀº ÀÌÁß ÇÇÄ¡¿¡ ÀÇÇØ Çâ»óµÉ ¼ö ÀÖÀ¸¸ç, »óºÎÀÇ ¹Ì¼¼ ³ª»ç»êÀº ÀÛÀº Á÷°æ¿¡¼­µµ Ç®¸² ÅäÅ©¿¡ ÀúÇ×ÇÏ´Â ±â°èÀû ¾ÈÁ¤¼ºÀ» Çâ»ó½Ãų ¼ö ÀÖÀ» °ÍÀ¸·Î º¸ÀδÙ.

Small orthodontic mini-implants are useful as anchorage. However they have some weaknesses such as loosening. This study was carried out to analyze the mechanical effects of the dual pitch and diameter on the insertion and removal torque of mini-implants. Methods: The threads of mini-implants were mono and dual pitch. The diameters of mini-implants were 1.4 mm and 1.6 mm. Four groups were tested (mono 1.4 mm, mono 1.6 mm, dual 1.4 mm and dual 1.6 mm). All were inserted and removed on polyurethane foam with the torques being measured. Results: The maximum torque of the dual pitch groups was higher than the mono pitch groups during removal but lower during insertion. The maximum torque of the 1.6 mm diameter groups was higher than the 1.4 mm diameter groups during insertion and removal. The dual pitch 1.4 mm group showed the lowest insertion torque but had similar or superior levels of removal torque to that of the mono pitch 1.6 mm group. Conclusions: The dual pitch especially showed a continuous high removal torque after the peak. Despite the small diameter, the dual pitch might improve the initial mechanical stability.

Å°¿öµå

±³Á¤¿ë ¹Ì´ÏÀÓÇ÷£Æ®;¾ÈÁ¤¼º;ÀÌÁß ÇÇÄ¡;Á÷°æ
Orthodontic mini-implant;Stability;Dual pitch;Diameter

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