Abstract
This study evaluated the influence of cyclic loading on zirconia bar-shaped specimens after being subjected to three different surface treatments: particle abrasion with either 50 μm or 110 μm alumina and grinding with diamond points, while polished specimens served as a control. Statistical analysis revealed significant reduction (38-67%) in flexure strength (P < 0.001) after three million cycles of dynamic loading for all surface treatments. Scanning electron imaging revealed grain boundary thickening, grain pull-out, and micro-cracking as the main structural defects. The results suggest that various surface treatments of zirconia based dental ceramics may significantly influence their long term fatigue resistance in the oral environment.
Highlights
In the dental field, there is a trend to shift towards metal free restorations due to concerns about possible biological side effects of metallic alloys
The application of glass ceramic materials was limited to small-sized restorations which are not subjected to high stresses, impact shock, or lateral forces since otherwise the restorations had a high risk of fracture during function [1]
Subjecting the specimens to dynamic fatigue under water resulted in significant reduction in flexure strength with polished specimens demonstrating the least reduction (38%)
Summary
There is a trend to shift towards metal free restorations due to concerns about possible biological side effects of metallic alloys. At medium temperatures (
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