Mechanical Characteristics of Boron and Cerium Added NiCrMo Non-Precious Dental Casting Alloys

Abstract

Nickel–Chromium–Molybdenum (Ni–Cr–Mo) alloys are widely used for dental applications. This research was aimed to investigate improvement in the mechanical properties of Ni–Cr–Mo alloy through Boron and Cerium doping. These alloys were doped with boron and boron+cerium alloying elements. The mechanical testing of the samples revealed that minor addition of these alloying elements significantly improved the ultimate tensile strength and yield strength. Moreover, the melting points of the doped samples, determined by differential thermal analysis, decreased appreciably with doping elements. Furthermore, detailed wear testing was carried out to analyze the in-situ behavior of the alloys. Significant improvement in wear rate was noted for the boron and boron+cerium added alloy samples. Also biocompatibility for the three alloys in cytotoxicity test proved the suitability for the use of these alloys in dental prostheses.

Fig. 7 Depth of wear scar variation at different intervals (a): between 100 to 120 seconds, (b): between 1000 to 1020 seconds, (c): between 2000 to 2020 seconds, (d) between 3000 to 3020 seconds, (e): between 3980 to 4000 seconds. Summary of results taken from (a)–(e) is shown in (f).