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±³Á¤¿ë ¹Ì´Ï½ºÅ©·ùÀÇ cutting flute Çü¼ºÀÌ »ðÀÔ ¹× Á¦°Å ÅäÅ©¿¡ ¹ÌÄ¡´Â ¿µÇâ

Effect of the cutting flute of the orthodontic miniscrew on insertion and removal torque

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¹Úö¼ö ( Park Cheol-Soo ) - Chonbuk National University School of Dentistry Department of Orthodontics
ÀÓº´±¸ ( Lim Byoung-Gu ) - Chonbuk National University School of Dentistry Department of Orthodontics
¿øÀº±Ô ( Won Eun-Kyu ) - Chonbuk National University School of Dentistry Department of Orthodontics
ȲÁ¶¿¬ ( Hwang Jo-Yeon ) - Chonbuk National University School of Dentistry Department of Orthodontics
Ȳº° ( Hwang Byeol ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
ÁöÁ¤Èñ ( Ji Jeong-Hui ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
Àü¿ì¿ë ( Jeon Woo-Yong ) - Gwangyang Health College Department of Dental Engineering
À̹ÎÈ£ ( Lee Min-Ho ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
¹èżº ( Bae Tae-Sung ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials

Abstract

º» ¿¬±¸´Â ±³Á¤¿ë ¹Ì´Ï½ºÅ©·ùÀÇ ±¸Á¶Àû Ư¡ÀÎ ³ª»çºÎÀÇ ±æÀÌ º¯È­¿Í cutting fluteÀÇ Çü¼ºÀÌ »ðÀÔ ¹× Á¦°Å ÅäÅ©¿¡¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡Çϱâ À§ÇØ ½ÃÇàµÇ¾ú´Ù. ¹Ì´Ï½ºÅ©·ù´Â ³ª»çºÎÀÇ ±æÀÌ°¡ °¢°¢ 6.0 mm, 3.3 mm 2Á¾·ù¸¦ Á¦ÀÛÇÏ¿´´Ù.
Flute Çü¼º ¿µÇâÀ» »ìÆ캸±â À§ÇØ flute¸¦ Çü¼ºÇÏÁö ¾ÊÀº ¹Ì´Ï½ºÅ©·ù ½ÇÇ豺°ú flute¸¦ Çü¼ºÇÑ ½ÇÇ豺À¸·Î ³ª´©¾ú´Ù.
Flute Çü¼º ½Ã ¹Ì´Ï½ºÅ©·ùÀÇ tipÀ¸·ÎºÎÅÍ 6.0 mmÀÎ °æ¿ì´Â 4.0 mm ±×¸®°í 3.3 mmÀÎ °æ¿ì´Â 2.4 mm±îÁö flute¸¦¿øÁÖ»óÀÇ 180¡ÆÀ§Ä¡¿¡ 2°³¸¦ Çü¼ºÇÏ¿´´Ù. ¶ÇÇÑ flute Çü¼ºÀÇ ¿µÇâÀ» »ìÆ캸±â À§ÇØ ¹Ì´Ï½ºÅ©·ùÀÇ tipÀ¸·ÎºÎÅÍ 6.0 mm °æ¿ì´Â 4 mm ±×¸®°í 3.3 mm °æ¿ì´Â 2.4 mm±îÁö flute¸¦ ¿øÁÖ»óÀÇ 180¡ÆÀ§Ä¡¿¡ 2°³¸¦ Çü¼ºÇÏ¿´´Ù. »ðÀÔ ºÎÀ§¿¡µû¸¥ ÇÇÁú°ñÀÇ µÎ²²¿Í °ñ¹ÐµµÀÇ Â÷ÀÌ¿¡ µû¸¥ ¿µÇâÀ» ¹èÁ¦Çϱâ À§ÇØ ÇÇÁú°ñ µÎ²² 2 mm¿Í Çظé°ñ µÎ²² 10 mmÀÇÀΰø°ñ Biomechanical Test Block (Sawbones Inc, Vashon, WA, USA)À» ÀÌ¿ëÇÏ¿´´Ù. Àΰø°ñ¿¡ Á÷°æ 1 mm µå¸±·Îguide holeÀ» Çü¼ºÇÏ°í ¹Ì´Ï½ºÅ©·ù¸¦ ¼öÁ÷ÇÏ°Ô À§Ä¡½ÃŲ ´ÙÀ½ 0.1 N¡¤cm Á¤¹ÐµµÀÇ µðÁöÅÐ ÅäÅ© °ÔÀÌÁö (9810P, Aikoh Engineering Co., Japan)¿¡ ¾à 1.2 kgÀÇ Á¤ÇÏÁßÀ» °¡ÇÑ »óÅ¿¡¼­ ³ª»çºÎÀÇ top±îÁö »ðÀÔÇÏ¸ç ¾ò¾îÁø ÃÖ´ë ÅäÅ© °ª°ú»ðÀÔ ¹æÇâÀÇ ¿ª¹æÇâÀ¸·Î Á¦°ÅÇÒ ¶§ÀÇ ÃÖ´ë ÅäÅ© °ªÀ» ±â·ÏÇÏ¿´´Ù. ±æÀÌ 6.0 mm¿Í 3.3 mm ¹Ì´Ï½ºÅ©·ùÀÇ »ðÀÔ ÅäÅ©°ªÀº °¢°¢ (29.53¡¾1.84) N¡¤cm¿Í (26.84¡¾2.15) N¡¤cm, ±×¸®°í Á¦°Å ÅäÅ© °ªÀº °¢°¢ (14.50¡¾1.37) N¡¤cm¿Í(13.15¡¾2.89) N¡¤cm¸¦ º¸¿´À¸¸ç »óÈ£°£¿¡ Åë°èÇÐÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù(P>0.05). FluteÀÇ Çü¼ºÀ¸·Î6.0 §® ¹Ì´Ï½ºÅ©·ù¿¡¼­´Â »ðÀÔ°ú Á¦°Å ÅäÅ© °ªÀÌ °¢°¢ (30.13¡¾1.97) N¡¤cm¿Í (18.65¡¾1.10) N¡¤cm·Î °øÈ÷ Áõ°¡µÇ¾ú´Âµ¥Åë°èÇÐÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö´Â ¾Ê¾Ò´Ù(P>0.05). ±æÀÌ 3.3 mm ¹Ì´Ï½ºÅ©·ù¿¡¼­´Â »ðÀÔ°ú Á¦°Å ÅäÅ© °ªÀº °¢°¢(20.99¡¾3.94) N¡¤cm¿Í (11.32¡¾2.03) N¡¤cm·Î °øÈ÷ °¨¼ÒµÇ¾ú´Âµ¥ »ðÀÔ ÅäÅ© °ª¿¡¼­¸¸ Åë°èÇÐÀûÀ¸·Î À¯ÀÇÇÑ °¨¼Ò¸¦º¸¿´´Ù(P<0.05). ¹Ì´Ï½ºÅ©·ùÀÇ »ðÀÔ°ú Á¦°Å ÅäÅ© °ªÀº ³ª»çºÎÀÇ ±æÀÌ°¡ 2¹è Áõ°¡µÇ´Â °æ¿ì¿¡µµ Å« ÆøÀ¸·Î Áõ°¡µÇÁö¾Ê¾Ò°í, flute Çü¼ºÀÇ ¿µÇâÀº ³ª»çºÎÀÇ ±æÀÌ¿¡ µû¶ó ´Ù¸£°Ô ³ªÅ¸³µ´Ù.

The purpose of this study was to evaluate the structural characteristics of the thread length of orthodontic mini-screws and the effects of insertion and removal torques according to the formation of the cutting flute. Two types of mini-screws were made, with a thread length of 6.0 mm and a thread length of 3.3 mm. In order to examine the effect of flute formation, the experiment group was divided into a miniscrew test group with flute formation and an experiment group without flute formation. To evaluate the effect of flute formation, two flutes were formed at 180¡Æon the circumference, and at the tip of the mini screw, up to 4 mm for thread length of 6.0 mm and 2.4 mm for thread length of 3.3 mm. A biomechanical test block formed of 2 mm cortical bone and 10 mm cancellous bone was used to eliminate the influence of the difference in cortical bone thickness and bone density according to the insertion site. 1 mm diameter guide hole was drilled on the test block and the mini-screw was placed vertically. Using a 0.1 N¡¤cm precision digital torque gauge, the maximum torque value was recorded at this time by embedding it to the top of the screw under a static load of 1.2 kg and the value when it was removed in the opposite direction. The insertion torque values for the 6.0 mm and 3.3 mm length mini screws were (29.53¡¾1.84) N¡¤cm and (26.84¡¾2.15) N¡¤cm, and the removal torque values are (14.50¡¾1.37) N¡¤cm and (13.15¡¾2.89) N¡¤cm, respectively.
There were no statistically significant differences (P>0.05). The flute of 6.0 mm mini-screws had no statistically significant difference in both insertion and removal torque values and increased to (30.13¡¾1.97) N¡¤cm and (18.65¡¾1.10) N¡¤cm (P>0.05). In experiments with 3.3 mm mini-screws, the insertion and removal torque values decreased to (20.99¡¾3.94) N¡¤cm and (11.32¡¾2.03) N¡¤cm, respectively, showing a statistically significant decrease only in the insertion torque values (P<0.05). The insertion and removal torque values of the mini-screw were not significantly increased even when the screw length was doubled, and the flute formation effect was different with the screw length.

Å°¿öµå

¹Ì´Ï½ºÅ©·ù; Àΰø°ñ; Flute; »ðÀÔ ÅäÅ©; Á¦°Å ÅäÅ©
Miniscrew; Flute; Sawbone; Insertion torque; Removal torque

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