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KMID : 0362120030250010009
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Journal of Technologic Dentistry
2003 Volume.25 No. 1 p.9 ~ p.20
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A Study on How Cyclic Casting of Base Metal Alloy forDental Ceramic Crown May Effects upon Its MechanicalProperties and Microstructure
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Choi Un-Jae
Shin Mu-Hak
Chung Hee-Sun
Koh Myoung-Won
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Abstract
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Using a nickel-chrome casting alloy called ’Rexillium V’ which is also available as base metalalloy for dental ceramic crown, 4 types of mixtures(A, B, C, D) with old and new metal wereprepared for cyclic casting. The results of cyclic casting can be outlined as follows: 1. For Vickers hardness after casting, specimen A and D tended to have lower hardness in thecourse of cyclic casting, while specimen B and C tended to higher hardness. 2. The results of X-ray diffraction analysis showed that major crystal phase contained nickel-chrome compounds and carbide. 3. The observation results of SEM photographs after cyclic casting show that there was asignificant tendency to have similar structures among experimental groups. 4. The results of EDX analysis after cyclic casting showed that there were little differences inchemical composition between parent metal and base metal alloy.Although industrial nickel-chrome cast alloy did not show any significant change in materialproperties even through cyclic casting over several times, it is recommended that more there bemore in-depth studies on how to detect any potential corrosion, discoloration and toxication ofdental ceramic crown implanted in patient’s oral cavity.
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KEYWORD
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Dental Base Metal Alloys, Cyclic Casting
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