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EFFECT OF Cl- AND S2- IONS IN ARTIFICIAL SALIVA ON TARNISH AND CORROSION RESISTANCE OF DENTAL NOBLE METAL ALLOYS 1. DENTAL COMMERCIAL NOBLE METAL BASED ALLOYS

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Abstract

°á·Ð
Ä¡°ú¿ë ±Í±Ý¼Ó°è ÇÕ±ÝÁß °í±Ý°è ÇÕ±Ý 5Á¾, Àú±Ý°è ÇÕ±Ý 7 Á¾, Æȶóµã°è ÇÕ±Ý 4 Á¾ ¹× Àº-
Æȶóµã°è ÇÕ±Ý 8Á¾ µî ÃÑ 24 Á¾À» ½ÇÇè´ë»óÀ¸·Î ÇÏ¿´°í, º¯Çü Fusayama ÀΰøŸ¾× (¿°¼ÒÀÌ
¿Â ³óµµ = 12.22 mM/§¤, ȲÀÌ¿Â ³óµµ = 0.01 mM/§¤, pH = 6.7) À» Ç¥ÁØ ÀüÇؾ×À¸·Î ¿°¼Ò
ÀÌ¿Â ³óµµ¸¦ 1.22 mM, 24.44 mM ¹× 61.10 mM/§¤ ·Î º¯È­ÇÑ ÀΰøŸ¾×°ú Ȳȭ³ªÆ®·ýÀÇ Ã·
°¡·Î ȲÀÌ¿Â ³óµµ¸¦ 0.01 mM, 0.10 mM, 0.20 mM, 0.35 mM, 0.50 mM, 1.00 mM, 5.00
mM, 10.0 mM ¹× 20.0 mM/§¤·Î º¯È­ÇÑ ÀΰøŸ¾× µî ÃÑ 36 Á¾ÀÇ ÀüÇؾ×À» »ç¿ëÇÏ¿© Á¤Àü
À§ ÀåÄ¡·Î º¯»ö ¹× ºÎ½Ä ½ÃÇè°ú ºÐÀ層µµ°è·Î º¯»ö ½ÃÇèÀ» ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù
1. ȲÀÌ¿Â ³óµµ°¡ ÀÏÁ¤ÇÑ ÀΰøŸ¾×¿¡¼­ ¿°¼ÒÀÌ¿Â ³óµµ¸¦ 1.22 mM, 12.22 mM, 24.44 mM
¹× 61.10 mM/§¤·Î Áõ°¡ÇÏ¿©µµ Ä¡°ú¿ë ±Í±Ý¼Ó°è ÇÕ±ÝÀÇ Á¤ÀüÀ§ºÐ±Ø °î¼±Àº Å©°Ô º¯È­ÇÏÁö
¾Ê¾Ò´Ù.
2. ¿°¼ÒÀÌ¿Â ³óµµ°¡ ÀÏÁ¤ÇÑ ÀΰøŸ¾×¿¡¼­ ȲÀÌ¿Â ³óµµ¸¦ 0.01 mM, 0.10 mM, 0.50 mM,
1.00 mM, 5.00 mM, 10.00 mM ¹× 20.00 mM/§¤·Î Áõ°¡ÇÑ °æ¿ì ¸ðµç Çձݿ¡¼­ ºÎ½ÄÀüÀ§´Â
¾à 500 mY ±îÁö °¨¼ÒÇÏ¿´°í Àü·ù¹Ðµµ´Â ¾à 100 ¹èÁ¤µµ Áõ°¡ÇÏ¿© ºÎ½ÄÀúÇ×Àº °¨¼ÒÇÏ¿´´Ù.
3. Àü±âÈ­ÇÐÀû ºÎ½Ä½ÃÇè ÈÄ ÃøÁ¤ÇÑ ÇÕ±ÝÀÇ »ö º¯È­ (¡âE) ´Â °í±Ý°è Çձݿ¡¼­´Â Ãʱâ Ȳ
ÀÌ¿Â ³óµµ°¡ 1.00 mM/§¤ ÀÎ °æ¿ì±îÁöÀÇ »ö º¯È­ (¡âE)´Â ȲÀÌ¿Â ³óµµ¿¡ µû¶ó Áõ°¡ÇÏ¿´À¸³ª
1.00 mM/§¤À̻󿡼­´Â ¼­¼­È÷ Áõ°¡ÇÏ¿© ÀÏÁ¤ °ªÀ» À¯ÁöÇÏ¿´´Ù. Àú±Ý°è Çձݿ¡¼­´Â Ãʱâ Ȳ
ÀÌ¿Â ³óµµÀÇ Áõ°¡¿¡ µû¶ó »ö º¯È­ (¡âE)´Â ±ÞÈ÷ °¨¼ÒÇÏ´Ù°¡ ¼­¼­È÷ Áõ°¡ÇÏ¿© ÀÏÁ¤ °ªÀ» À¯
ÁöÇÏ¿´´Ù.
4 ÀüÇؾ׿¡ ÀÏÁ¤±â°£ ħÁöÇÑ ÈÄ ÃøÁ¤ÇÑ »ö º¯È­ (¡âE)´Â ¸ðµç Çձݿ¡¼­ 0.1 mM/§¤ÀÇ È²
ÀÌ¿Â ³óµµ±îÁö º¯»öÀº ±ÞÈ÷ Áõ°¡ÇÏ´Ù°¡ ÀÏÁ¤ °ªÀ» À¯ÁöÇÏ¿´À¸¸ç, °í±Ý°è ÇÕ±ÝÀÇ °æ¿ì ¡âE
´Â 4¡­6 ¹üÀ§·Î ³·°Ô º¯»öÇÏ¿´À¸³ª Àú±Ý°è ¹× Àº-Æȶóµã°è ÇÕ±ÝÀÇ °æ¿ì ¡âE ´Â 20¡­35 ·Î
³ô°Ô º¯»öÇÏ¿´´Ù.

The object of this study was to study effect of Cl- and
S2- ions on tarnish and corrosion resistance of dental noble metal alloys
in the artificial saliva. Twenty-four commercial dental noble metal based alloys (five for
high-Au based alloys, seven for low-Au based alloys, four for Pd-based alloys, and
eight for Ag-Pd based alloys) were investigated by the Potentiostat and the
Spectrophotometer. Modified Fusayama`s artificial salivas with various concentrations of
Cl- ion (1.22, 12.22, 24.44, and 61.10 mM/§¤) and S2- ion
(0.01, 0.10, 0.20, 0.35, 0.50, 1.00, 5.00, 10.0, and 20.0 mM/§¤) were used as electrolytes for
test. From the experiments, the following results were obtained. Concentration of
Cl- ion in artificial saliva did not influence the potentiodynamic polarization
curves for dental noble metal alloys. On the other hand, concentration of
S2- ion in artificial saliva strongly influenced the potentiodynamic
polarization curves for dental noble metal alloys; corrosion potentials were decreased up
to 500mV and current densities were increased by 100 times. In color change
measurements after potentiodynamic polarization curve test, the values of ¥ÄE for
high-Au and Pd-based alloys were increased as the concentration of S2-
increased up to 1.00 mM and then were reached a plateau at higher concentration of
S2-. For low-Au and Ag-Pd based alloys, the values of ¥ÄE were
drastically deceased as the concentration of S2- increased up to 1.00mM
and then were reached a plateau at higher concentration of S2-. By
determining the color of an alloy before exposure to a test solution, the color change
were ranged of 4¡­6 for high-Au and Pd-based alloys and 20¡­35 for low-Au and
Ag-Pd based alloys.

Å°¿öµå

Noble metal alloys; Tarnish and corrosion; Artificial saliva; Chlorine ion; Sulfur ion;

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