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KMID : 0362419940320020249
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Journal of Korean Academy of Prosthodontics
1994 Volume.32 No. 2 p.249 ~ p.267
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A study on the fatigue and removable partial denture designs for patients in Korea
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Kim Hak-Sun
Kim Kwang-Nam
Chang Ik-Tae
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Abstract
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The purpose of this study was to compare the fatigue, physical properties, flexibility and surface roughness of titanium used in removable partial dentures with those of a type IV gold alloy and a cobalt-chromium alloy. Fatigue testing subjected the test specimen to rapid cycling at a given stress until failure occurred by using a small-sized, electro-dynamic type bending fatigue testing machine. The S-N curves for the framework materials were generated. For tensile testing, a tensile bar as described in the ADA Specification No. 14 was subjected to tensile loading until failure occurred. Load-displacement curves were generated for 18 gauge round specimen and tapered half round specimen. Then the flexibilities were calculated. The surface roughnesses were compared by analyzer. @ES Through analyses of the data, the following conclusions were obtained. @EN 1. The fatigue property of titanium was higher than that of a type IV gold alloy (p≤0.05), but there was no significant difference between titanium and a cobalt-chromium alloy (p≥0.05). 2. The yield strength, the ultimate tensile strength and Vickers hardness of titanium were higher than those of a type IV gold alloy but lower than those of a coalt-chromium alloy(p≤0.05). 3. The percentage of elongation and reduction of area of titanium were the highest(p≤0.05). 4. The surface roughness of titanium was the greatest(p≤0.05). 5. The flexibility of titanium was lower than that of a type that of type IV gold alloy but higher than that of a cobalt-chromium alloy(p≤0.05).
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