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Frictional resistance of different ceramic brackets and their relationship to the second order angulation between bracket slot and wire

Korean Journal of Orthodontics 2006³â 36±Ç 3È£ p.207 ~ 217
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ÃÖÀ±Á¤ ( Choi Yoon-Jeong ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
¹Ú¿µÃ¶ ( Park Young-Chel ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç

Abstract

»çȸ ¹®È­Àû ¹ß´Þ°ú ÇÔ²² ½É¹ÌÀû ¿ä±¸°¡ Áõ°¡µÇ¸é¼­ ±³Á¤ ȯÀÚ ¼öÀÇ Áõ°¡¿Í ÇÔ²² ±³Á¤ Ä¡·á ÁßÀÇ ½É¹Ì¼º¿¡ ´ëÇÑ ¿ä±¸µµ ´Ã¾î³ª°í ÀÖ´Ù. Ä¡·á Áß ½É¹Ì¼ºÀ» ÁõÁø½ÃÅ°±â À§ÇÑ ¸ñÀûÀ¸·Î ¼¼¶ó¹Í ºê¶óÄÏÀÌ °³¹ßµÇ¾î ³Î¸® »ç¿ëµÇ°í ÀÖÀ¸³ª ¼¼¶ó¹Í ÀÚüÀÇ Ã뼺(brittleness), ´ëÇÕÄ¡ÀÇ ¸¶¸ð»Ó¸¸ ¾Æ´Ï¶ó, ÀÓ»óÀûÀ¸·Î ³ôÀº ¸¶Âû ÀúÇ×ÀÌ ±× ¹®Á¦Á¡À¸·Î ÁöÀûµÇ°í ÀÖ´Ù. º» ¿¬±¸´Â ¼¼¶ó¹Í ºê¶óÄÏÀÇ ¸¶Âû ÀúÇ×À» ¾Ë¾Æº¸°í ±× °³¼±¹æ¾ÈÀ» ã´Âµ¥ ÁöħÀÌ µÇ°íÀÚ ÇÏ´Â ¸ñÀûÀ¸·Î ½ÃÇàÇÏ¿´´Ù. ¿¬±¸ Àç·á·Î´Â ¸¶Âû ÀúÇ×À» ÁÙÀ̱â À§ÇØ ±Ý¼Ó ½½·ÔÀÌ »ðÀÔµÈ ´Ù°áÁ¤ ¼¼¶ó¹Í ºê¶óÄÏ°ú ±Ý¼Ó ½½·ÔÀÌ »ð¿ìµÇÁö ¾ÊÀº ´Ü°áÁ¤ ¼¼¶ó¹Í ºê¶óÄÏ°ú ±Ý¼Ó ºê¶óÄÏÀ» ÀÌ¿ëÇÏ¿´À¸¸ç, .019{\times}.025 ½ºÅ×Àθ®½º ¿ÍÀ̾ ºê¶óÄÏ ½½·Ô¿¡ ´ëÇØ 0^{circ},;10^{circ}ÀÇ °¢µµ¸¦ ºÎ¿©ÇÏ¿© ¸¸´É½ÃÇè±â»ó¿¡¼­ À̵¿½ÃÄÑ ±×¶§ÀÇ Á¤Àû, µ¿Àû ¸¶Âû·ÂÀ» ÃøÁ¤ÇÏ¿´´Ù. ¿¬±¸ °á°ú, ÀüüÀûÀÎ Æò±Õ ¸¶Âû·ÂÀº ±Ý¼Ó ºê¶óÄÏ, ±Ý¼Ó ½½·ÔÀÌ »ðÀÔµÈ ´Ù°áÁ¤ ¼¼¶ó¹Í ºê¶óÄÏ, ´Ü°áÁ¤ ¼¼¶ó¹Í ºê¶óÄÏ ¼øÀ¸·Î Áõ°¡ÇÏ¿´´Ù. ºê¶óÄÏ ½½·Ô°ú ¿ÍÀÌ¾î »çÀÌÀÇ °¢µµ°¡ 0^{circ}ÀÏ ¶§°¡ 10^{circ}ÀÏ ¶§¿¡ ºñÇؼ­ ³·Àº ¸¶Âû ÀúÇ×À» º¸¿´À¸¸ç, ºê¶óÄÏ ½½·Ô°ú ¿ÍÀÌ¾î »çÀÌÀÇ °¢µµ°¡ 10^{circ}ÀÏ ¶§ ´Ü°áÁ¤ ¼¼¶ó¹Í ºê¶óÄÏÀÇ µ¿Àû, Á¤Àû ¸¶Âû ÀúÇ×Àº ±Ý¼Ó ºê¶óÄÏÀ̳ª ±Ý¼Ó ½½·ÔÀÌ »ðÀÔµÈ ´Ù°áÁ¤ ¼¼¶ó¹Í ºê¶óÄÏ¿¡ ºñÇØ À¯ÀǼº ÀÖ°Ô Å©°Ô ³ªÅ¸³µ´Ù (p<0.05). º» ¿¬±¸¸¦ ÅëÇؼ­ ±Ý¼Ó ºê¶óÄÏ¿¡ ºñÇØ ¼¼¶ó¹Í ºê¶óÄÏ, ƯÈ÷ ±Ý¼Ó ½½·ÔÀÌ »ðÀÔµÇÁö ¾ÊÀº ´Ü°áÁ¤ ¼¼¶ó¹Í ºê¶óÄÏÀÇ ¸¶Âû ÀúÇ×ÀÌ ³ôÀº °ÍÀ» È®ÀÎÇÒ ¼ö ÀÖ¾úÀ¸¸ç, ºê¶óÄÏ ½½·Ô°ú ¿ÍÀ̾ÀÇ °¢µµ°¡ Áõ°¡ÇÏ¸é ¸¶Âû ÀúÇ×µµ Ä¿Áö´Â °ÍÀ» È®ÀÎÇÒ ¼ö ÀÖ¾ú´Ù. µû¶ó¼­ ¸¶Âû·ÂÀ» ÁÙÀ̱â À§ÇÑ ¼¼¶ó¹Í ºê¶óÄÏÀÇ °³¹ß°ú ÇÔ²² ±³Á¤ Ä¡·á ½Ã °úµµÇÑ Ä¡°ü °æ»ç¸¦ ¸·À½À¸·Î½á ¸¶Âû ÀúÇ×À» ÁÙÀÌ°í ½É¹Ì¼ºÀ» À¯ÁöÇϸ鼭 Ä¡·áÀÇ È¿À²À» ³ôÀ̵µ·Ï ÇؾßÇÒ °ÍÀÌ´Ù.

Although ceramic brackets have been used widely for improved esthetics during treatment, ceramic brackets have some inherent problems; brittleness, attrition of the opposing teeth and high frictional resistance. This study was performed to understand the frictional resistance of the ceramic brackets, as well as to be a helpful reference for finding the solutions to the problem of frictional resistance. Three different kinds of brackets were used; metal bracket, polycrystalline ceramic brackets with a metal slot to reduce the high frictional resistance and monocrystalline ceramic brackets. The brackets were tested with a .019{times}.025 stainless steel wire with a second order angulation of 0^{circ};and;10^{circ}, and the static and kinetic frictional forces were measured on the universal testing machine. The results of this study showed that the ceramic brackets, especially the monocrystalline ceramic bracket without a metal slot, generated higher frictional resistance than the metal bracket, and the frictional resistance was increased as the angulation between the bracket slot and the wire increased. Therefore, the development of the ceramic bracket with reduced frictional resistance and the prevention of excessive crown tipping during orthodontic treatment will lead to the simultaneous attainment of more efficient and improved esthetic treatment goals.

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Ceramic bracket;Frictional resistance;Monocrystalline;Polycrystalline

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