Influence of different surface treatments on the fracture toughness of a commercial ZTA dental ceramic

Abstract

The objective of this study was to investigate how mechanical surface treatments performed for removal of excess of molten glass, influence the fracture toughness of a dental zirconia toughened alumina (In-Ceram® Zirconia). Infiltrated ZTA disks were submitted to three different surface treatments (grinding, sandblasting and grinding + sandblasting + annealing). Fracture toughness was accessed through indentation strength test (IS). X ray diffraction was used to investigate the metastability of tetragonal zirconia particles under all treatments proposed. Kruskall-Wallis non-parametrical test and Weibull statistics were used to analyze the results. Grinding (group 1) introduced defects which decreased the fracture toughness and reliability, presenting the lowest K IC. On the other hand, grinding followed by sandblasting and annealing (group 3) presented the highest K IC. Sandblasting (group 2) presented the highest reliability but lower K IC compared to group 3

Microstructure and Weibull distribution of rupture strength of clay-talc ceramics

“…The stressdependent Weibull modulus meant that the occurrence of a Weibull behavior remained valid only in limited stress ranges. A similar behavior and Weibull multistep characteristics were reported for zirconia ceramics having different surface treatment after sintering [26]. They were able to create supplementary surface defect populations that occurred besides the initial volume defect population.…”

Influence of Niobium Pentoxide and Sintering Temperature on Mechanical and Electrical Properties of Glass-ceramics Obtained from Recycled Automotive Windshields

“…Ten replicas were used to estimate the mechanical behavior for each condition. The reliability of the biaxial flexural strength results was determined by the Weibull method 40 . Moreover, Tukey tests was applied to the flexural strength with 0.05 confidence level to reveal the influence of niobium pentoxide content.…”

Evaluation of Water Sorption of Various Heat-Curing Acrylic Resins and the Effect of Aqueous Environment on its Fracture Toughness

“…20 Fracture toughness has been used as initial parameters to determine the clinical potential and limitations of dental materials. 21 Higher fracture toughness equals higher resistance to crack growth, which can be equated to higher clinical performance. 22 In the present research, the water sorption as well the fracture toughness of three types of heat-curing acrylic resin denture base materials was checked out in humid and wet conditions.…”