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A STUDY OF THE PHYSICAL PROPERTIES ON DENTAL COBALT-CHROMIUM ALLOYS

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Abstract

Ãß°¡ ±Ý¼ÓÀ» ³Ö¾î¼­ ÀÏ·ÃÀÇ Co-Cr-Ni ÇÕ±ÝÀ» ¸¸µé¾î¼­ ±â°èÀû ¼ºÁúÀ» Á¶»çÇÏ¿´´Ù. Molybdenum°ú Carbon ÇÔ·®À» °¨¼Ò½ÃÅ´À¸·Î½á Ä¡°ú¿ë ÇÕ±ÝÀ¸·Î¼­ º¸´Ù ³ªÀº ¼ºÁúÀ» ¾ò¾ú´Ù. Áï Á¾·¡Ç°¿¡ ºñÇÏ¿© º¸´Ù ³ôÀº ½ÅÀåÀ²À» ¾ò¾ú°í, ±ØÇÑÀÎÀå°­µµ´Â ±×´ë·Î ³ô°Ô À¯ÁöµÇ¾ú´Ù. ±×·¯³ª °æµµ´Â ³·¾Ò´Ù. ÀÌ·± ÇÕ±ÝÀÇ ÀÌÁ¡Àº ´ÙÀ½°ú °°ÀÌ ¿ä¾àÇÒ ¼ö ÀÖ°Ú´Ù.
1. ±¹¼ÒÀÇÄ¡ÀÇ Å¬¶ó½ºÇÁÀÇ ¼ö¸íÀÌ ±æ¾îÁø´Ù.
2. °¨¼ÒµÈ °æµµ¿Í ³ô¾ÆÁø ½ÅÀåÀ²Àº ÀåÂø¹°À» ±ð±â ½±°Ô ÇÏ¸ç ±¹¼ÒÀÇÄ¡ÀÇ ÀûÇÕÀ» ´õ ÁÁ°Ô ÇÒ °ÍÀÌ´Ù.
3. Çձݰú Á¢Ã˵Ǵ ºÎÀ§ÀÇ Ä¡Áú¼Ò¸ð°¡ °¨¼ÒµÈ´Ù.
Since the introduction of Cobalt-Chromium alloys to dentistry by Erdle and Prange in 1933, many new alloys have been formulated. The physical properties of some of these alloys such as Vitallium, Ticonium 50 and HS 21 are shown in Table 1.
The main dissatisfactions with these alloys have been:
1. Clasps made of such alloys break in service, some after a relatively short time.
2. Due to the relatively high hardness and low elongation properties of this alloy, some minor but necessary adjustments are difficult. Furthermore, due to the high hardness, the wear of any teeth contacting the metal is rather high.
In order to improve the mechanical properties of these alloys a Co-Cr-Ni series of alloys with additives of other elements, were formulated,
The major improvement for dental purposesrwas obtained by decreasing both Molybdenum and Carbon content. When compared with regular alloys, the new alloys have a high elongation value, and the ultimate tensile strengths remain high However, the hardness is lower. The better physical properties of this alloy may be benefitial in dental services. They may be summarized as:
1. Partial denture clasps last longer.
2. The reduced hardness eases the grinding and, combined with higher elongation, facilitates the adjusting of the partial denture.
3. The wear of natural teeth coming in contact with the alloy is reduced.

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