Strength characterization and lifetime prediction of dental ceramic materials
| Autor: | Monika Felder, Thomas Albrecht, Atilim Eser, Vasiliki Stournari, Chao Liu, Christoph Broeckmann, Siegward D. Heintze |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Dental Stress Analysis
Ceramics Materials science Surface Properties chemistry.chemical_element Fractography 02 engineering and technology law.invention Stress (mechanics) 03 medical and health sciences 0302 clinical medicine law Materials Testing General Materials Science Cubic zirconia Ceramic Composite material General Dentistry Yttria-stabilized zirconia Glass-ceramic Weibull modulus 030206 dentistry 021001 nanoscience & nanotechnology Dental Porcelain chemistry Mechanics of Materials visual_art visual_art.visual_art_medium Lithium Zirconium 0210 nano-technology |
| Zdroj: | Dental Materials. 37:94-105 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2020.10.015 |
| Popis: | Objective To determine the Weibull modulus m , the characteristic strength σ 0 ,the subcritical crack growth (SCG) parameters ( n & A * ) as well as the lifetime durability of three dental ceramic materials in water: a polycrystalline yttria-stabilized zirconia (Zenostar MT O, YSZ, Ivoclar Vivadent/Wieland, Germany), a lithium disilicate glass ceramic (IPS e.max CAD, LD, Ivoclar Vivadent, Liechtenstein), and a zirconia-containing lithium silicate glass ceramic (Celtra Duo, ZLS, Dentsply Sirona Inc, USA). Methods 30 specimens (O12 mm × 0.9 mm thickness) of each material were fabricated. The biaxial ring-on-ring bending tests at four stress rates σ ˙ (100, 10, 1, 0.1 MPa/s) were performed in water for all three ceramics. The results were used to determine the Weibull and SCG parameters, and to plot the Strength-Probability-Time (SPT) diagram. Results YSZ showed the highest m (12.5) and highest σ 0 (542 MPa), while the values for the glass ceramic materials were lower: for LD m = 4.7, σ 0 = 407 MPa, and for ZLS m = 2.7, σ 0 = 279 MPa. The n for YSZ, LD and ZLS in water were 31.1, 13.7 and 16.6, respectively. The strength of YSZ decreased by 50% within a simulated period of 10 years, and for the glass ceramic materials the decrease was up to 80%. Significance Determining the Weibull and SCG parameters from the constant stress rate testing is an efficient methodology for ranking materials in terms of durability and longevity. |
| Databáze: | OpenAIRE |
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