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Effect of cutting flute length and shape on insertion and removal torque of orthodontic mini-implants
À±¼øµ¿, ÀÓ¼ºÈÆ,
¼Ò¼Ó »ó¼¼Á¤º¸
À±¼øµ¿ ( Yoon Soon-Dong ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
ÀÓ¼ºÈÆ ( Lim Sung-Hoon ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
KMID : 0361920090390020095
Abstract
º» ¿¬±¸´Â self-tapping screwÀÇ Æ¯Â¡Àû ±¸Á¶ÀÎ cutting fluteÀÇ ±æÀÌ ¹× ÇüÅ º¯È¿¡ µû¸¥ ¹Ì´Ï ÀÓÇ÷£Æ®ÀÇ ½Ä¸³ ¹× Á¦°Å ÅäÅ©¸¦ ºñ±³Çغ¸±â À§ÇØ ½ÃÇàµÇ¾ú´Ù. ¿Ü°æ, ³»°æ, ±æÀÌ ¹× pitch µî ´Ù¸¥ Á¶°ÇÀÌ ¸ðµÎ µ¿ÀÏÇÏ°í cutting fluteÀÇ ÇüŸ¸ ´Ù¸¥ ¼¼ Á¾·ùÀÇ ¹Ì´Ï ÀÓÇ÷£Æ®¸¦ »ç¿ëÇÏ¿´´Ù(A±º; 2.6 mm ±æÀÌÀÇ flute°¡ Çü¼ºµÈ ±×·ì, B±º; 3.9 mmÀÇ ±æÀÌÀÌ¸é¼ Á÷¼±ÇüÀÇ flute¸¦ °®´Â ±×·ì, C±º; 3.9 mmÀÇ ±æÀÌÀÌ¸é¼ ³ª¼±ÇüÀÇ flute¸¦ °®´Â ±×·ì). °ñ¹Ðµµ¸¦ ±ÕÀÏÇÏ°Ô Çϱâ À§ÇØ ½ÇÇè¿ë Àΰø°ñ(Sawbones Inc., USA)À» »ç¿ëÇÏ¿´À¸¸ç, ¼öÁ÷·Â ¹× ȸÀü¼Óµµ¸¦ ÀÏÁ¤ÇÏ°Ô Çϱâ À§ÇØ ±¸µ¿½Ä ÅäÅ© ½ÃÇè±â¸¦ ÀÌ¿ëÇÏ¿´´Ù. ±× °á°ú ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù. ÃÑ »ðÀÔ ½Ã°£Àº 2 mm µÎ²²ÀÇ ÇÇÁú°ñ ½ÃÆí¿¡¼´Â ¼¼ ±º °£¿¡ Â÷À̸¦ º¸ÀÌÁö ¾ÊÀ¸³ª, 4 mm µÎ²²ÀÇ ÇÇÁú°ñ ½ÃÆí¿¡¼´Â C±º £¾ B±º £¾ A±º ¼øÀ¸·Î ªÀº »ðÀÔ ½Ã°£À» º¸¿´´Ù. ÃÖ´ë »ðÀÔ ÅäÅ©´Â 2 mm µÎ²²ÀÇ ½ÃÆí¿¡¼´Â A±ºÀÌ ´Ù¸¥ µÎ ±º¿¡ ºñÇØ ³ôÀº °ªÀ» º¸À̳ª, 4 mm µÎ²²ÀÇ ÇÇÁú°ñ ½ÃÆí¿¡¼´Â C±º £¾ A±º £¾ B±º ¼øÀ¸·Î ³ôÀº °ªÀ» º¸¿´´Ù. ÃÖ´ë Á¦°Å ÅäÅ©´Â 2 mm µÎ²²ÀÇ ÇÇÁú°ñ ½ÃÆí¿¡¼´Â ¼¼ ±º »çÀÌ¿¡ Â÷ÀÌ°¡ ¾øÀ¸³ª, 4 mm µÎ²²ÀÇ ÇÇÁú°ñ ½ÃÆí¿¡¼´Â C±ºÀÌ ´Ù¸¥ µÎ ±º¿¡ ºñÇØ ³ôÀº °ªÀ» º¸¿©ÁÖ¾ú´Ù. ÀÌ»óÀÇ °á°ú·Î º¸¾Æ ÇÇÁú°ñÀÌ µÎ²¨¿î ºÎÀ§¿¡ ¹Ì´Ï ÀÓÇ÷£Æ®¸¦ ½Ä¸³ÇÒ °æ¿ì cutting fluteÀÇ ±æÀÌ ¹× ÇüÅ ¶ÇÇÑ °í·ÁÇÏ¿© ¹Ì´Ï ÀÓÇ÷£Æ®¸¦ ¼±ÅÃÇÏ´Â °ÍÀÌ ¹Ù¶÷Á÷ÇÏ´Ù.
Objective: The purpose of this study was to evaluate the effect of length and shape of cutting flute on mechanical properties of orthodontic mini-implants.
Methods: Three types of mini-implants with different flute patterns (Type A with 2.6 mm long flute, Type B with 3.9 mm long and straight flute, Type C with 3.9 mm long and helical flute) were inserted into the biomechanical test blocks (Sawbones Inc., USA) with 2 mm and 4 mm cortical bone thicknesses to test insertion and removal torque.
Results: In 4 mm cortical bone thickness, Type C mini-implants showed highest maximum insertion torque, then Type A and Type B in order. Type C also showed shortest total insertion time and highest maximum removal torque, but Type A and B didn¡¯t showed statistically significant difference in insertion time and removal torque. In 2 mm cortical bone thickness, there were no significant difference in total insertion time and maximum removal torque in three types of mini-implants, but maximum insertion torque of Type A was higher than two other Types of mini-implants.
Conclusions: Consideration about length and shape of cutting flute of mini-implant is also required when the placement site has thick cortical bone.
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Cutting flute;ÃÑ »ðÀÔ ½Ã°£;ÃÖ´ë »ðÀÔ ÅäÅ©;ÃÖ´ë Á¦°Å ÅäÅ©
Cutting flute;Total insertion time;Maximum insertion torque;Maximum removal torque
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