Investigating the performance of new and old electrolyte when electropolishing recycled cobalt chrome.
Cardiff Metropolitan University
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Objective: This study investigated the efficiency of electropolishing on recycled cobalt chrome when using new and old electrolyte. Method and materials: The investigation was carried out in a BesQual S700 electropolishing unit filled with Renfert® ‘elektrolyt’. Twenty custom-made recycled cobalt chrome samples were each individually submerged in electrolyte for two 5 minute cycles at 2.5-3Amps (A). Half of the samples were individually submerged in new electrolyte solution whilst the other half in old solution. Digital microscope images, bath temperature and pH readings were taken at five minute intervals to document surface changes at three time-frames; 1: prior to electropolishing, 2: five minutes after electropolishing and 3: after a further five minutes electropolishing. The samples were assessed by naked eye and photographed using a Dino-Lite digital microscope at x20 magnification, which is an adequate cobalt chrome surface inspection method stipulated by the British Standard ISO 19959:2005. Results: The outcome revealed that only three samples in the old electrolyte solution reached a 50% polished surface. Whereas the new solution produced six 100% fully polished surfaces. Conclusion: The findings supported previous studies and manufacture guidelines which state; the more used the electrolyte, the poorer the polishing result. Electrolyte used over time requires replenishing to achieve a high lustre of polishing. Further investigation could identify a suggested duration after which the electrolyte requires renewing.
BSc (Hons) Dental Technology