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Biocorrosion of dental alloys due to Desulfotomaculum nigrificans bacteria

Mystkowska J.

Acta of Bioengineering and Biomechanics

2016

Vol. 18, no. 4

87--96

Purpose: Degradation processes of metallic biomaterials in the oral cavity limit the stability and reliability of dental materials. The influence of environment bacteria Desulfotomaculum nigrificans sulfate reducing bacteria on the corrosion processes of Co-Cr-Mo and Ti-6Al-4V alloys was assessed. Methods: After 28 and 56 days of contact of the materials with the bacterial environment, the surfaces of the tested biomaterials were observed by means of confocal scanning laser microscopy (CSLM), and their chemical composition was studied using X-Ray Photoelectron Spectrometry (XPS). Results: Corrosive changes and the presence of sulfur (with medium atomic concentration of 0.5% for Co-Cr-Mo and 0.3% for Ti-6AL-4V) were observed on the surface of the biomaterials. Image analysis conducted using APHELION software indicated that corrosion pits took up approx. 2.3% and 1.8% (after 28 days) and 4.2% and 3.1% (after 56 days) of the total tested surfaces of cobalt and titanium alloys respectively. The greatest number of corrosion pits had a surface area within the range of 1-50 m2. They constituted from 37% until 83% of all changes, depending on the type of material. Conclusions: An evident influence of the SRB on the cobalt and titanium alloys surfaces was observed. Significant corrosive losses caused by the activity of micro-organisms were stated on the studied metallic surfaces. The results of this study have much cognitive and utilitarian significance.