Comparison of certain mechanical properties including deflection fatigue resistance of Cobalt Chromium alloy & Nylon tooth colored clasping materials

I.M. Al-Awady, Azhar; Abdul-Hadi Al-Nakkash, Widad

	Comparison of certain mechanical properties including deflection fatigue resistance of Cobalt Chromium alloy & Nylon tooth colored clasping materials
Journal of baghdad college of dentistry
Article 1, Volume 24, Issue 2, 2012, Pages 6-10
Authors
Azhar I.M. Al-Awady; Widad Abdul-Hadi Al-Nakkash
Abstract
Background: This study was conducted to test & compare the mechanical properties including the ultimate tensile strength, yield strength, modulus of elasticity, ductility & deflection fatigue resistance of Cobalt Chromium alloy samples, Flexite Supreme samples & commercially available Nylon samples, thus evaluating efficiency & life time expectancy of these materials. Materials and methods: A reproduction mold was made from addition silicon reproduction material to produce wax patterns of standardized measures, these sacrificial patterns were used to produce fifty samples of each of the three materials (a total of 150 samples). These specimens were tested by tensile testing machine and deflection fatigue resistance machine. Results: The tested materials expressed differences in their mechanical properties that were highly significant in all comparisons. Conclusions: Cobalt Chromium alloy, aside from its poor aesthetic, performs better in shallow deflection and have a reasonable life expectancy. Flexile supreme is more aesthetically acceptable, with better performance and longer life expectancy. Commercial nylon is with poor quality rendering it unusable
Keywords
deflection fatigue; tensile strength testing; cobalt chromium; Flexile supreme

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