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THE EFFECT OF HEAT TREATMENT ON THREE KINDS OF ORTHODONTIC WIRES

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Abstract

°á·Ð
º» ¿¬±¸´Â Ä¡°ú ±³Á¤ ½Ã¼ú½Ã ÀÌ¿ëµÇ°í ÀÖ´Â preformed 0.018' Á÷°æÀÇ ½ºÅ×Àη¹½º-½ºÆ¿°è,
ÄÚ¹ßÆ®-Å©·Ò°è ¹× ´ÏÄÌ-ƼŸ´½°è ±³Á¤¿ë ¿øÇü ¼±À縦 ´ë»óÀ¸·Î ¿­Ã³¸® ÀüÀÇ ±ÁÈû Ư¼ºÀ»
°Ë»çÇÏ¿´°í, Àü±â·Î¿¡¼­ 300¡É¿¡¼­ 900¡É±îÁö 100¡É °£°ÝÀ¸·Î 5ºÐ°£ ¿­Ã³¸® ÇÑ ´ÙÀ½ ³Ã°¢Á¶
°Ç¿¡ µû¸¥ ±ÁÈûƯ¼ºÀÇ º¯È­¿Í ÃÖÀû ¿­Ã³¸® ¿Âµµ¸¦ ÇÏ¿´À¸¸ç, À̸¦ ¾ËÄڿ÷¥ÇÁ»ó¿¡¼­ ¿­Ã³¸®
È¿°ú¿Í ºñ±³ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ½ºÅ×Àη¹½º-½ºÆ¿°è, ÄÚ¹ßÆ®-Å©·Ò°è ¹× ´ÏÄÌ-ƼŸ´½°è ¼±Àçµé¿¡ ´ëÇÑ ¿­Ã³¸® ÀüÀÇ ±â°è
Àû ¼ºÁú Áß ±ÁÈû·Â°ú ±ÁÈû°­¼º°è¼ö´Â ½ºÅ×Àη¹½º-½ºÆ¿°è¿Í ÄÚ¹ßÆ®-Å©·Ò°è ¼±Àç°¡ ¿ì¼öÇÑ
¹Ý¸é ź¼ºÈ¸º¹Àº ´ÏÄÌ-ƼŸ´½°è ¼±Àç°¡ °¡Àå ¿ì¼öÇÏ¿´´Ù.
2. ½ºÅ×Àη¹½º-½ºÆ¿°è ¼±Àç´Â 500¡ÉÀÇ ºÎ±Ù¿¡¼­, ÄÚ¹ßÆ®-Å©·Ò°è ¼±Àç´Â 600¡É ºÎ±Ù¿¡¼­ ¿­
ó¸® ÇÏ´Â °ÍÀÌ ÃÖÀû ¿­Ã³¸® Á¶°ÇÀ̾ú°í, ÄÚ¹ßÆ®-Å©·Ò°è ¼±Àç°¡ °¡Àå ÇöÀúÇÑ ¿­Ã³¸® È¿°ú¸¦
³ªÅ¸³ÂÀ¸¸ç °ø³Ã°ú ¼ö³ÃÀÇ ³Ã°¢¹æ¹ý¿¡ µû¸¥ ¿­Ã³¸® È¿°ú´Â Â÷ÀÌ°¡ ¾ø¾ú´Ù.
3. ´ÏÄÌ-ƼŸ´½°è ¼±Àç´Â ¿­Ã³¸®¸¦ ÇÔ¿¡ µû¶ó °­µµ°¡ °¨¼ÒµÇ°í ź¼ºÀû ¼ºÁúµµ ¼Ò¸êµÇ¹Ç·Î
Ư¼ö ¸ñÀû¿Ü¿¡´Â ¿­Ã³¸®¸¦ Çؼ­´Â ¾ÈµÉ °ÍÀ¸·Î ÆǸíµÇ¾ú°í, ½ºÅ×Àη¹½º-½ºÆ¿°è³ª ÄÚ¹ßÆ®-Å©
·Ò°è ¼±Àçµµ Àç°áÁ¤ÀÌ Çü¼ºµÇ´Â ¿Âµµ ÀÌ»ó, Áï ½ºÅ×Àη¹½º-½ºÆ¿°èÀÇ °æ¿ì 700¡ÉÀÌ»ó, ÄÚ¹ß
Æ®-Å©·Ò°èÀÇ °æ¿ì 800¡ÉÀÌ»óÀ¸·Î ¿­Ã³¸®¸¦ ÇÏ¸é °­µµ ¹× ź¼ºÀÌ °¨¼ÒµÊÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.
4. ½ºÅ×Àη¹½º-½ºÆ¿°è ¹× ÄÚ¹ßÆ®-Å©·Ò°è ¼±Àç¿¡ ´ëÇÑ ¾ËÄڿ÷¥ÇÁ»óÀÇ ¿­Ã³¸®´Â ¿­Ã³¸® Àü
¿¡ ºñÇØ ±ÁÈû°­µµ°¡ Áõ°¡µÇ¾úÀ¸³ª Àü±â·ÎÀÇ ÃÖÀû¿ÂµµÀÇ ¿­Ã³¸® È¿°ú¿¡´Â ¹ÌÄ¡Áö ¸øÇÏ¿´´Ù.
#ÃÊ·Ï#
With the development of various alloy wires and the production of different wire size
and configurations, it is imperative that the orthodontist should understand the physical
and mechanical properties of orthodontic arch wire materials.
The proper heat treatment improves the elastic properties and dimensional stability of
formed orthodontic wires.
This experiment al study tested bending characteristics of performed 0.018' stainless
steel, Co-Cr and Ni-Ti alloy wires. After these wires were heat-treated for 5 minutes
from 300¡É to 900¡É in 100¡É increments, the change of bending characteristics and
optimum heat treatment temperature were established and the author compared the
effect of heat treatment on alcohol lamp with that of electrical furnace.
The following conclusion could be drawn from the results of this investigation :
1. When the mechanical properties of non heat-treated stainless steel, Co-Cr and Ni-Ti
alloy wires were compared, stainless steel and Co-Cr alloy wire are superior to Ni-Ti
alloy wire in bending force and bending stiffness, but Ni-Ti alloy wire is the most
superior in elastic property.
2. The optimum heat treatment temperature was 500¡É for stainless steel and 600¡É for
Co-Cr alloy wire and heat treatment of Co-Cr alloy wire was the most effective and
there was no difference in air cooling and water cooling.
3. Stiffness and elastic property of heat treated Ni-Ti alloy wire were decreased and
so it was suggested that Ni-Ti alloy wire must be heat treated only for specific
purpose and also the stiffness and elastic property of stainless steel and Co-Cr alloy
wire were decreased if they were heat treated above the temperature of recrystallization
: 700¡É for stainless steel and 800¡É for Co-Cr alloy wire.
4. Heat treatment effects on alcohol lamp of stainless steel and Co-Cr alloy wire
improved the bending force than non-heated wires, but inferior to that of optimum
temperature in electrical furnace.

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