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Changes in surface roughness of bracket and wire after experimental sliding - preliminary study using an atomic force microscopy

Korean Journal of Orthodontics 2010³â 40±Ç 3È£ p.155 ~ 166
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Abstract

ºê¶óÄÏ°ú È£¼± °£¿¡ ¹ß»ýÇÏ´Â ¸¶ÂûÀº Ä¡¾Æ À̵¿ÀÇ È¿À²¿¡ »ó´çÇÑ ¿µÇâÀ» ¹ÌÄ£´Ù. ¸¶Âû·Â¿¡ ±â¿©ÇÏ´Â ¿ä¼Ò Áß Æ¯È÷ ºê¶óÄÏ°ú È£¼±ÀÇ Ç¥¸éÁ¶µµ´Â Áß¿äÇÑ ¿ä¼ÒÀÌ´Ù. º» ¿¬±¸´Â ºê¶óÄÏ°ú ź¼±À» ½ÇÇèÀûÀ¸·Î ¸¶Âû½ÃŲ ÈÄ, ¿øÀÚÇö¹Ì°æ (atomic force microscope, AFM)À» »ç¿ëÇÏ¿© ºê¶óÄÏ ½½·Ô°ú ±³Á¤¿ë ź¼±ÀÇ Ç¥¸é Á¶µµ º¯È­¸¦ Á¤¼ºÀû, Á¤·®ÀûÀ¸·Î ÃøÁ¤ÇÏ°í ºñ±³ Æò°¡ÇÏ¿© ºê¶óÄÏ°ú È£¼± °£ÀÇ ¸¶ÂûÀÌ °¢°¢ÀÇ Ç¥¸é º¯È­¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ±Ô¸íÇÏ°íÀÚ ½ÃÇàµÇ¾ú´Ù. ½ºÅ×Àθ®½º ½ºÆ¿ ºê¶óÄÏ°ú ¼¼¶ó¹Í ºê¶óÄÏ¿¡ °¢°¢ ½ºÅ×Àθ®½º ½ºÆ¿ ź¼±°ú TMA ź¼±À» ½ÇÇèÀûÀ¸·Î È°ÁÖ¸¶Âû½ÃŲ ÈÄ °¢°¢À» ¿øÀÚÇö¹Ì°æÀ» ÀÌ¿ëÇÏ¿© Ç¥¸éÀ» °üÂûÇÏ¿´´Ù. ½ÇÇè°á°ú ºê¶óÄϺ¸´Ù´Â ±³Á¤¿ë ź¼±¿¡¼­ È°ÁÖ¸¶Âû ÈÄ¿¡ ´õ ¸¹Àº Ç¥¸é º¯È­°¡ ³ªÅ¸³µ´Ù. ¶ÇÇÑ È°ÁÖ¸¶Âû ÈÄ¿¡ ½ºÅ×Àθ®½º ½ºÆ¿ ºê¶óÄÏÀº Ç¥¸é Á¶µµÀÇ À¯ÀÇÇÑ º¯È­°¡ ¾ø¾úÀ¸³ª ¼¼¶ó¹Í ºê¶óÄÏÀº Ç¥¸é Á¶µµ°¡ °¨¼ÒÇÏ¿´´Ù. ±×¸®°í ±³Á¤¿ë ź¼±Àº ¸ðµÎ È°ÁÖ¸¶Âû ÈÄ¿¡ Ç¥¸é Á¶µµ°¡ Áõ°¡ÇÏ¿´À¸¸ç ÀÌ·¯ÇÑ Ç¥¸é º¯È­´Â ½ºÅ×Àθ®½º ½ºÆ¿ ºê¶óÄϺ¸´Ù ¼¼¶ó¹Í ºê¶óÄÏ°úÀÇ È°ÁÖ¸¶Âû ÈÄ¿¡ ´õ Å« °ÍÀ¸·Î °üÂûµÇ¾ú´Ù. º» ½ÇÇèÀ¸·Î ¿øÀÚÇö¹Ì°æÀº ºê¶óÄÏ ½½·Ô°ú ź¼±ÀÇ Ç¥¸é Á¶µµ¸¦ Á¤·®ÀûÀ¸·Î ÃøÁ¤ÇÏ´Â µ¥¿¡ À¯¿ëÇÑ ¼ö´ÜÀÓÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.

Objective: The surface roughness of orthodontic materials is an essential factor that determines the coefficient of friction and the effectiveness of tooth movement. The aim of this study is to evaluate the surface roughness change of the brackets and wires after experimental sliding quantitatively.

Methods: Before and after experimental sliding tests, the surface roughness of stainless steel brackets, ceramic brackets, stainless steel wires, and beta-titanium (TMA) wires were investigated and compared using atomic force microscopy (AFM).

Results: After sliding tests, changes in the surface of the wire were greater than changes in the bracket slot surface. The surface roughness of the stainless steel bracket was not significantly increased after sliding test, whereas the roughness of ceramic brackets was decreased. Both the surface roughness of stainless steel and TMA wires were increased after sliding test. More changes were observed on the ceramic bracket than the stainless steel bracket.

Conclusions: AFM is a valuable research tool when analyzing the surface roughness of the brackets and wires quantitatively.

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ºê¶óÄÏ;¸¶Âû·Â;Ç¥¸é Á¶µµ;¿øÀÚÇö¹Ì°æ
Bracket;Friction;Surface roughness;Atomic force microscopy

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