Abstract | STATEMENT OF PROBLEM: PURPOSE: MATERIAL AND METHODS: Test bars (n = 10) were tested either dry, in water, or in artificial saliva (Fusayama type) with a constant deflection fatigue test. The number of loading cycles before fracture was registered as resistance to fatigue. To establish whether there were indications of alloy corrosion occurring during the fatigue test, the testing liquid was analyzed retrospectively with an atomic absorbance spectroscopy. To determine elemental composition of the fracture surface, fracture surfaces of the test bars were analyzed with a scanning electron microscope and energy dispersive spectroscopy. RESULTS: The bars that were tested dry had a mean fatigue resistance of 78,000 loading cycles, whereas test specimens tested in artificial saliva had a resistance of 59,000 loading cycles and 36, 000 for those tested in water. Atomic absorbance spectroscopy revealed small amounts of cobalt (Co) in testing water and in artificial saliva. Energy dispersive spectroscopy analysis revealed differences in elemental composition of a fatigue fracture surface compared with that of a 1-bend fracture. CONCLUSIONS:
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Authors | L V Lassila, P K Vallittu |
Journal | The Journal of prosthetic dentistry
(J Prosthet Dent)
Vol. 80
Issue 6
Pg. 708-13
(Dec 1998)
ISSN: 0022-3913 [Print] United States |
PMID | 9830077
(Publication Type: Comparative Study, Journal Article)
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Chemical References |
- Chromium Alloys
- Saliva, Artificial
- Water
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Topics |
- Analysis of Variance
- Chromium Alloys
(chemistry)
- Corrosion
- Dental Clasps
- Drug Interactions
- Materials Testing
(methods, statistics & numerical data)
- Retrospective Studies
- Saliva, Artificial
(chemistry)
- Spectrophotometry, Atomic
- Stress, Mechanical
- Survival Analysis
- Water
(chemistry)
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