Impact of high-speed sintering, layer thickness and artificial aging on the fracture load and two-body wear of zirconia crowns

Wiedenmann, Felicitas; Pfefferle, Regina; Reichert, Axel; Jerman, Eva und Stawarczyk, Bogna (2020): Impact of high-speed sintering, layer thickness and artificial aging on the fracture load and two-body wear of zirconia crowns. In: Dental Materials, Bd. 36, Nr. 7: S. 846-853

Abstract

Objective. To investigate the impact of high-speed sintering, layer thickness and artificial aging in a chewing simulator on the fracture load (FL) and two-body wear (2BW) of 4Y-TZP crowns. Methods. 4Y-TZP crowns (Ceramill Zolid HT+, Amann Girrbach AG) in three different layer thicknesses (0.5, 1.0, 1.5;N=192, n = 64/group) were manufactured using CAD/CAM technology and sintered at 1580 degrees C (high-speed sintering) or 1450 degrees C (control group). Specimens were polished in two-steps and bonded to standardized CoCr abutments with Multilink Automix (Ivoclar Vivadent). 2BW after 6000 thermo- and 1,200,000 chewing-cycles employing enamel antagonists was determined using best fit machining. FL was tested before and after artificial aging. Univariate ANOVAs, post hoc Scheffe, unpaired t-, Kruskal-Wallis- and Mann-Whitney-U-test were computed (p <0.05). Results. High-speed sintering resulted in less 2BW of the zirconia than the control group (p = 0.013). High-speed sintering (p = 0.001-0.006) and an increase in layer thickness (p < 0.001-0.012) resulted in higher FL values, while artificial aging led to a reduction of FL (p < 0.001). Significance. As high-speed sintering resulted in less two-body wear of the zirconia and comparable or even higher fracture load results than the control group, this cost- and time efficient alternative presents promising mechanical results. (C) 2020 The Academy of Dental Materials.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0109-5641
• Sprache: Englisch