Original Article

Corrosion Behavior of a Nickel-Base Dental Casting Alloy in Artificial Saliva Studied by Weight Loss and Polarization Techniques

Abstract

Objectives: Nickel-chromium (Ni-Cr) base dental alloys with desirable properties have been employed in prosthodontics for years. Corrosion behavior of a Ni-Cr base alloy in artificial saliva with different pH values is determined in this work.
Materials and Methods: Corrosion behavior of Ni-Cr alloy was studied using weight loss described by corrosion rate (CR) in mils per year (mpy) and potentiodynamic polarization described by corrosion potential (CP) in mV and current density (CD) in mA/cm2 in artificial saliva with different pH. Surface morphology was studied using scanning electron microscopy (SEM). Statistical difference was assessed using one-way ANOVA and post-hoc Tukey's honestly significant difference (HSD) test with a difference significance of 95%.
Results: In weight loss method, CR was 71.95±3.40, 17.26±1.03, 8.92±0.35, and 6.93±0.54 mpy at pH values of 2.5, 5, 7, and 9, respectively. CR obtained at pH of 2.5 was significantly different than that in other groups, but those obtained at pH of 5, 7, and 9 were not significantly different. In the polarization method, CP values were significantly different. CD measured at pH of 2.5 and 5 was significantly different than the rest of pH values (P<0.05). CRs at pH of 7 and 9 were not significantly different. SEM exhibited the formation of preferential sites of corrosion attacks influenced by pH.
Conclusions: Both techniques revealed consistent results. Corrosion resistance increases as pH increases towards less acidic conditions. In more acidic saliva, .....

Sarantopoulos DM, Beck KA, Holsen R, Berzins DW. Corrosion of CoCr and NiCr dental alloys alloyed with palladium. J Prosthet Dent 2011; 105(1): 35-43.

Supreetha SN, Ravindra K, Murali H. Effect of heat treatment on the corrosion behavior of nickel chromium (wiron 99) alloys. IJDA 2010; 2(1): 90-95.

Matkovic T, Matkovic P, Malina J. Effects of Ni and Mo on the microstructure and some other properties of Co-Cr dental alloys. Journal of Alloys and Compounds 2004; 366(1-2): 293-297.

Wylie CM, Shelton RM, Fleming GJ, Davenport AJ. Corrosion of nickel-based dental casting alloys. Dent Mater 2007; 23(6): 714-23.

Lin HY, Bowers B, Wolan JT, Cai Z, Bumgardner JD. Metallurgical, surface, and corrosion analysis of Ni-Cr dental casting alloys before and after porcelain firing. Dental Materials 2008; 24(3): 378-385.

Geis-Gerstorfer J. In vitro corrosion measurements of dental alloys. J Dent 1994; 22(4): 247-51.

Ameer MA, Khamis E, Al-Motlaq M. Electochemicalbehaviour of recasting Ni-Cr and Co-Cr non-precious dental alloys. Corrosion Science 2004; 46(11): 2825-2836.

Khamis E, Seddik M. Corrosion evaluation of recasting non-precious dental alloys. Int Dent J 1995; 45(3):209-17.

Abey S, Mathew M, Lee D, Knoernschild KK, Wimmer MA, Sukotjo C. Electrochemical Behavior of Dental Implants (CpTi): Influence of pH of Artificial Saliva. J Oral Implantol2014; 40(1): 3-10.

deDeMicheli SM, Riesgo O. Electochemical study of corrosion in Ni-Cr dental alloys. Biomaterials 1982; 3(4):209-12.

Qiu J, Yu WQ, Zhang FQ, Smales RJ, Zhang YL, Lu CH. Corrosion behaviour and surface analysis of a Co-Cr and two Ni-Cr dental alloys before and after simulated porcelain firing.Eur J Oral Sci 2011; 119(1): 93-101.

Wataha JC, Lockwood PE, Khajotia SS, Turner R. Effect of pH on element release from dental casting alloys. J Prosthet Dent 1998; 80(6): 691-8.

Fontana MG. Corrosion Engineering, 2nd Edition. USA: McGraw-Hill;1986.

Molina C, Nogués L, Martinez-Gomis J, Peraire M, Salsench J, Sevilla P, Gil FJ.Dental casting alloys behaviour during power toothbrushing with toothpastes of various abrasivities. Part II: corrosion and ion release. J Mater Sci Mater Med. 2008;19(9):3015-9.

Barão VA, Mathew MT, Assunção WG, Yuan JC, Wimmer MA, Sukotjo C. Stability of cp-Ti and Ti-6Al-4V alloy for dental implants as a function of saliva pH - an electrochemical study. Clin Oral Implants Res 2012; 23(9): 1055-62.

Mareci D, Nemtoi G, Aelenei N, BocanuC.The electrochemical behaviour of various non-precious Ni and Co based alloys in artificial saliva.Eur Cell Mater 2005; 8(10):1-7.

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IssueVol 16, No 1 (2019) QRcode
SectionOriginal Article
DOI https://doi.org/10.18502/fid.v16i1.1104
Keywords
Corrosion Nickel-Chromium Alloys Artificial Saliva Polarization Weight Loss

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1.
Moslehifard E, Moslehifard M, Ghasemzadeh S, Nasirpouri F. Corrosion Behavior of a Nickel-Base Dental Casting Alloy in Artificial Saliva Studied by Weight Loss and Polarization Techniques. Front Dent. 2019;16(1):13-20.