Strasser, Thomas and Wertz, Markus and Koenig, Andreas and Koetzsch, Torsten and Rosentritt, Martin (2023) Microstructure, composition, and flexural strength of different layers within zirconia materials with strength gradient. DENTAL MATERIALS, 39 (5). pp. 463-468. ISSN 0109-5641, 1879-0097
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Objectives: The aim of this study was to compare composition, microstructure, and mechanical strength of current multilayer zirconia blanks.Methods: Bar shaped specimens were made from several layers of multilayer zirconia blanks (Cercon ht ML, Dentsply Sirona, US; Katana Zirconia YML, Kuraray, J;SHOFU Disk ZR Lucent Supra, Shofu, J; priti multidisc ZrO2 Multi Translucent, Pritidenta, D; IPS e.max ZirCAD Prime, Ivoclar Vivadent, FL). Flexural strength was determined in a three-point bending test on extra-thin bars. X-ray diffraction (XRD) with Rietveld refinement was used to assess crystal structure and scanning electron microscopy (SEM) imaging to visualize the micro-structure of each material and layer.Results: Mean flexural strength varied between 467.5 +/- 97.5 MPa (top layer, IPS e.max ZirCAD Prime) and 898.0 +/- 188.5 MPa (bottom layer, Cercon ht ML) with significant (p <= 0.055) differences between the in-dividual layers. XRD indicated 5Y-TZP for enamel-layers, 3Y-TZP for dentine-layers, individual mixtures of 3Y-TZP, 4Y-TZP, or 5 Y-TZP for intermediate layers. SEM analysis showed grain sizes between approx. 0.15 and 4 mu m. Grain size tended to decrease from top to bottom layers.Significance: The investigated blanks differ predominantly in the intermediate layers. In addition to di-mensioning of restorations, the milling position in the blanks must also be taken into account when using multilayer zirconia as restorative material.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MONOLITHIC ZIRCONIA; HIGHLY-TRANSLUCENT; AGING STABILITY; CERAMICS; Multilayer; Zirconia; 3Y-TZP; 4Y-TZP; 5Y-TZP; XRD; X-ray diffraction; Flexural strength; SEM |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Jan 2024 06:53 |
| Last Modified: | 31 Jan 2024 06:53 |
| URI: | https://pred.uni-regensburg.de/id/eprint/59722 |
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