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The Effect of Recasting on Microhardness of Cobalt/Chromium Base Metal Alloys | ||
| Tikrit Journal for Dental Sciences | ||
| Volume 11, Issue 1, June 2023, Pages 140-145 PDF (383.8 K) | ||
| DOI: 10.25130/tjds.11.1.16 | ||
| Authors | ||
| Asmaa Abdulrazak Hasan* ; Amaal Kadhim Mohammed | ||
| Department of Prosthetic Dental Technology,College of Health and Medical Technology Middle Technical University, Iraq | ||
| Abstract | ||
| Castings made of base metals include the cobalt/chromium alloy. This alloy is frequently used in dentistry to make crowns, bridges, and partial dentures. This alloy was first promoted as a less expensive option to cast gold that had even better physical and mechanical properties and approximately comparable biocompatibility. It was better suited for long-span bridges and cast prostheses. Aim: to assess how recasting affects the cobalt/chromium base metal alloys' microhardness. Material and Methods: 42 disc-shaped specimens of cobalt/chrome alloy measuring 5 mm in diameter and 3 mm in thickness were prepared. The cast specimens were divided into three groups based on the weight of the newly and previously cast Co/Cr alloy addition: the first group was 14 specimens of (new cast) alloy; the second group was 14 specimens of (50% new cast+50% old cast) alloy; and the third group was 14 specimens of (old cast) alloy. All the specimens were subjected to measuring the microhardness property by using a digital microhardness tester. Results: Using a student t-test, it was determined that there was no significant difference in the microhardness between the two groups (new cast) and (new cast + old cast), and that there was also no significant difference between the groups (new cast + old cast) and (old cast) (P-value p>0.05), yet that there was a highly significant difference between the two groups (new cast) and (old cast) (P-value P<0.01). Conclusion: The inclusion of different ratios of fresh and recast Co/Cr alloys can affect the microhardness. Also, the recast Co/Cr metal alloy has shown excellent results for microhardness property. | ||
| Keywords | ||
| cobalt/chromium; cast prostheses; base metals Keywords | ||
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