Wertz, Markus and Schmidt, Michael Benno and Hoelzig, Hieronymus and Wagner, Maximilian and Abel, Bernd and Kloess, Gert and Hahnel, Sebastian and Koenig, Andreas (2022) Rhombohedral Phase Formation in Yttria-Stabilized Zirconia Induced by Dental Technical Tools and Its Impact on Dental Applications. MATERIALS, 15 (13): 4471. ISSN , 1996-1944
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In the study the influence of different dental technical tools on the surface temperature and phase composition of fixed dental prostheses (FDPs) made of yttria-partially stabilized zirconia polycrystals (3Y-/4Y-/5Y-PSZ) was investigated. FDPs were fabricated by using computer-aided manufacturing (CAM). The FDPs were treated with a contra-angle handpiece equipped with different burs and polishers. The resulting surface temperatures were measured with a thermographic camera, and the resulting phase transformations were investigated by X-ray diffraction and quantified by Rietveld refinement. Processing with burs resulted in no phase transformation, but a preferred orientation shift. Using coarse polisher induced a phase transformation to the rhombohedral phase, while fine polishers produced no relevant phase transformations and no preferred orientation shift. Compared to the monoclinic phase (ca. 9% theoretical volume increase), which is associated with low-temperature degradation (LTD), the rhombohedral phase is much more voluminous (ca. 15% theoretical volume increase) and distorted and, therefore, has a greater degradation potential.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LOW-TEMPERATURE DEGRADATION; X-RAY-DIFFRACTION; Y-TZP; MECHANICAL-PROPERTIES; TRANSFORMATION; PROSTHESES; TRANSLUCENCY; ABSORPTION; EVOLUTION; CERAMICS; dental zirconia; X-ray diffraction; fixed dental prosthesis; computer-aided manufacturing; phase composition |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Feb 2024 14:59 |
| Last Modified: | 27 Feb 2024 14:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/58070 |
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