The impact of long-term environmental conditions on the lifetime prediction (S-N) of biomaterial used in dentistry

Abstract

The paper presents the influence of long-term oral environment conditions on the mechanical parameters of zirconium dioxide, which is used in medicine and machine construction. Samples made with the original method of zirconium dioxide were placed in a physiological saline environment. 120 samples were used for the study, divided into two groups A and B in terms of geometry 1.5 mm × 1.5 mm × 12 mm and 2 mm × 2.5 mm × 25. Then each group into two subgroups A and A′ and B and B′, samples from subgroup A′ and B′ were placed in physiological saline for one year. Monotonic and cyclic tests were carried out using the three-point bending method. It was noted that the material that is kept in the liquid medium is characterized by slightly reducing the static strength. When analyzing fatigue tests, one can notice a very large decrease in the limit of fatigue in relation to dry samples. The literature analysis carried out showed that although zirconium dioxide material has been known since the 1990s, very few studies have been carried out to determine the limit of fatigue for all-ceramic materials.