Roentgenological detection of casting defects in cobalt‐chromium alloy frameworks

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Abstract
Summary: A method for non‐destructive X‐ray investigation of casting defects in cobalt‐chromium prosthetic frameworks has been developed and tested. The attenuation properties of a cobalt‐chromium alloy were studied. A dental X‐ray machine with a tube voltage working at 70 kVp and a focus‐film distance of 45–50 cm on dental ultraspeed film made it possible to detect defects representing 10% or less of the thickness of cobalt‐chromium details with dimensions between 0.6 and 3.0 mm.The frequency and site of internal defects in sixty‐six frameworks were investigated. Of the sixty‐six frameworks only two were without roentgenologically visible defects. In the other sixty‐four frameworks 294 pores or cracks were recorded. The defects were mostly situated in the saddles. Porosities occurred in 53% of the saddlebar regions. The results confirmed the need for a non‐destructive routine test of prosthetic frameworks.
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