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KMID : 0362219940210010037
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Journal of The Korean Research Society for Dental Materials
1994 Volume.21 No. 1 p.37 ~ p.58
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CORROSION STUDIES ON TITANIUM IN CONTACT WITH GOLD, SILVER-PALLADIUM AND NICKEL-CHROMIUM ALLOYS IN VITRO
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김춘호
계기성/고영무
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Abstract
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The purpose of this study was to evaluate the effect of area ratio, the difference of the corrosion rate according to the elapsed time, and corrosion reaction on titanium in contact with gold alloy, silver-palladium alloy, and nickel-chromium
alloy
by
measuring the amount of metal elements released in the artificial saliva using Inductively Coupled Plasma Emission S?pectroscopy(ICPES).
The specimen of 15 titanium plates, 5 gold salloy plates, 5 silver-palladium alloy plates, 5 nickel-chromium alloy oplates and 20 acrylic resin plates were fabricated, and also the specimen of 60 titanium plugs, 30 gold alloy plugs, 30
silver-palladium
alloy plugs and 30 nickel-chromium alloy plugs were fabricated.
The smount of metal elements relessed when titanium, gold alloy, and nickel -chromium alloy immersed solely in the artificial saliva solution of 70ml, and the galvanic corrosion reaction occurred on the titanium in contact withgold alloy,
silver-palladium alloy, and nickel-chromium alloy were observed during 21 weeks in the interval of each 7 week using immersion test, and then the amount of metal elements released in the artificial saliva solution was measured using ICPES.
From the experiments, the following results were obtained :
1. Incase of immersing titanium, gold alloy, ,silver-palladium alloy, and nickel-chromium alloy solely in the artificial saliva solution(Group 1,2,3, and 4), the total amount of metal elements released was that group 4 was greater about 2.3
times
than
group 3, and about 7.8 times than group 2. In case of group 1, the amount of titanium released was not found after 8 week(p<0.001).
2. In cases of galvanic coupling of titanium in contact with gold alloy(Group 5, 5), the total amont of metal elements relesed of group 5 and 6 was less than that of group 7,8,9, and 10(p<0.05).
3. In case of galvanic coupling of titanium in contact with silver-palladium alloy(Group 7,8), the totalamount of metal elements released of group 7 was greater about twice than that of group 5, and that of group 8 was about 14 times than that
of
group
6 (p<0.05).
4. In case of galvanic coupilng of titanium in contact with nickel-chromium alloy(Group 9, 10), the total amount of me al elements relesased of group 9 and 10 was greater about 1.8~3.2 times than that of group 7 and 8, and was greater about
4.3~25
times than that of group 5,6(p<0.05).
5. In the efect of galvanic corrosion according to the difference of the area ratio of cathode and anode, the total amount of metal elements released was that group 5 was greater about 4 times than group 6, group 8 was greater abot twice than
group 7,
and group 10 was greater about 1.5 times than group 9)p<0.05).
6. In the effect of galvanic corrosion according to the elasped time during 21 weeks in the interval of each
7. week, the amount of metal elements released was decreased markedly in case of galvanic coupling of the titanium in contact with gold alloy and silver-palladium alloy but the the total amont of nickel and beryllium released was not decreased
markedly
in case of galvanic coupling of the titanium in contact with nickel-chromium alloy(p<0.05).
In conclusion, not only in case of immersing nickel-chromium alloy solely in the artificial saliva solution(Group 4 ) but also in case of galvanic coupling of the titanium in contact with nickel-chromium alloy(Group 9,10), the totalamount of
metal
elements released of group 4, 9 and 10 was greater than that of group 5, 6, 7 and 8, and there was greater about 4.3~25 times than that of group 5 and 6, and therefore, it was considered that the corrosion behavior of nickel-chromium alloy had
more
problem than that of gold alloy and silver-palladium and futher research is needed.
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