Complexity of the relationships between the sintering-temperature-dependent grain size, airborne-particle abrasion, ageing and strength of 3Y-TZP ceramics

被引：35

作者：

Cotic, Jasna ^{[1
]}

Jevnikar, Peter ^{[1
]}

Kocjan, Andraz ^{[2
]}

Kosmac, Tomaz ^{[2
]}

机构：

[1] Univ Ljubljana, Fac Med, Dept Prosthodont, Hrvatski Trg 6, SI-1000 Ljubljana, Slovenia

[2] Jozef Stefan Inst, Dept Ceram Engn, Jamova 39, SI-1000 Ljubljana, Slovenia

来源：

DENTAL MATERIALS | 2016年 / 32卷 / 04期

关键词：

Zirconia; Sintering temperature; Grain size; Airborne-particle abrasion; Low-temperature degradation; PHASE-TRANSFORMATION; FLEXURAL STRENGTH; HYDROTHERMAL DEGRADATION; ZIRCONIA; SURFACE; RELIABILITY; FUTURE;

D O I：

10.1016/j.dental.2015.12.004

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

Objectives. This study was designed to explore the complex relationships between the sintering-temperature-dependent grain size, airborne-particle abrasion, ageing and strength of 3Y-TZP ceramics. Methods. Biomedical grade 3Y-TZP powder was used to fabricate 180 discs. Half of them were sintered at 1400 degrees C for 2 h and half at 1500 degrees C for 2 h. A total of 18 groups of 10 were formed and subjected to the fully crossed experimental protocol of airborne-particle abrasion with Al2O3 at 2.5 bar (no abrasion, 50 mu m, 110 mu m) and accelerated ageing at 134 degrees C (no ageing, 12 h, 48 h). The relative amount of monoclinic phase was determined with XRD. The biaxial flexural strength was measured and statistically analyzed using the three-way ANOVA followed by predetermined contrasts and Tukey's HSD test (alpha = 0.05). Results. The low-temperature-sintered, fine-grained ceramic exhibited an excellent ageing resistance, while the high-temperature-sintered, coarse-grained ceramic experienced a higher surface strengthening and a substantially improved ageing resistance with respect to the airborne-particle abrasion. The overall performance of this material was superior. Significance. Our results show that the sintering temperature has a minor effect on the flexural strength, but it plays a crucial role in the surface strengthening and the ageing behaviour of 3Y-TZP dental ceramics. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.

引用

页码：510 / 518

页数：9

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