Ni-Cr Dental Alloys Performance in Oral Physiological Conditions

Abstract

Metal alloys employed as biomaterials in contact with the human body necessitate thorough investigation to ensure their biocompatibility and absence of injury. The corrosion resistance of a dental material is the fundamental quality for its biological safety, as all problems originate from the corrosion process [1]. There is limited research on Ni-based dental biomaterials, and none has been identified in these dental materials utilized commercially artificial saliva. This research intends to explore the corrosion characteristics of six commercially used Ni-based alloys in artificial saliva [2]. The specimens were received as cylindrical ingots and were sectioned to provide five samples of each manufacturer, each having a cylindrical shape of 2mm in height for the study. This scientific investigation employed the following techniques: open circuit potential, potentiodynamic polarization tests, and electrochemical impedance spectroscopy. The study results indicated the passivation susceptibility of the various specimens. Furthermore, the comparison of materials revealed that chromium content was the critical determinant of superior corrosion resistance. Nonetheless, with comparable chromium content, the increased molybdenum concentration improved the resistance. The findings of this investigation indicated that the biological safety of the dental materials examined in Ringer solution was determined to be extremely high for two specimens and adequate for the remaining samples.