Cristina Maria Bortun, Brandusa Ghiban, Nicolae Ghiban, Lavinia Ardelean, Laura Cristina Rusu<br>Surface Characterization of Some CoCrMo Alloys <br>Used in RPD Technology

Cristina Maria Bortun, Brandusa Ghiban, Nicolae Ghiban, Lavinia Ardelean, Laura Cristina Rusu
Surface Characterization of Some CoCrMo Alloys
Used in RPD Technology

Abstract:

Aim of study was to compare the processed surfaces of removable partial dentures (RPD) made of different dental alloys of CoCrMo, because processing and finishing of these prostheses is difficult and can cause failures. There were used 4 types of CoCrMo alloys to achieve 50 RPD frameworks. Out of these, 12 were selected with no visible defects, in which the processing was minimum and subsequent adaptation optimal. These were tested in terms of composition, mechanical properties and then analyzed on metallographic microscope, stereomicroscope and Atomic Force Microscope (AFM), both in terms of quality and quantity. Analysis of investigation results showed that among the different CoCrMo alloys obvious differences occur in the processing by cutting - milling with hard cutters both at the reverse metallographic microscope and stereomicroscope. At the qualitative analysis AFM it can be observed that alloy “C” and HERAENIUM CE resemble in milling processing terms, presenting a waved aspect given by the striations parallel to the milling direction. At Wironit alloys and especially Wironit Extrahard it can be observed multiple aciculate bristles (spines) while polishing, which suggests a macroscopic distribution in surface of some tougher (harder) particles. This study allowed highlighting the following conclusions: metal alloys processing is very important for a good functioning of the prosthesis; the alloy Heraeniunm EC is the most suitable for the finest polishing, which is less used to manufacture RPD; it appears that alloy “C” has a better behaviour during processing than Wironit Extrahard. Keywords: processing, RPD, analysis

Issue: 2012, Volume 63, Issue 9

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