Shanghai Journal of Stomatology ›› 2017, Vol. 26 ›› Issue (2): 129-133.doi: 10.19439/j.sjos.2017.02.001

• Original Articles • Previous Articles     Next Articles

Effect of sintering temperature on mechanical properties of dental zirconia toughened alumina ceramics

FAN Jiang-yuan1, LIN Ting-ting1,2, HU Fang-xuan1, ZHENG Rui-bin1,2, FAN Fan1, MA Jian-feng1,2   

  1. 1.Institute of Stomatology, 2.Department of Prosthodontics, School & Hospital of Stomatology, Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China
  • Received:2016-07-05 Revised:2016-09-18 Online:2017-04-25 Published:2017-05-04

Abstract: PURPOSES: To investigate the effect of sintering temperature on mechanical properties of dental zirconia toughened alumina (ZTA) ceramics prepared by gel-casting technique. METHODS: The samples prepared by gel-casting were sintered at 1100, 1200, 1250, 1300 and 1400℃ for each group. The flexural strength, fracture toughness, Vickers hardness and brittleness index were obtained and microscopic morphology of each group was observed under scanning electron microscope (SEM). The data were statistically analyzed using SPSS 19.0 software package. RESULTS: The flexural strength, fracture toughness and Vickers hardness increased with the increasing sintering temperature during 1100~1400℃. The lowest brittleness index (0.74±0.16) μm-1/2 was observed in group sintered at 1200℃ and the highest (2.76±0.14) μm-1/2 was at 1400℃ (P<0.05), while the flexural strength of these two groups was (46.89±3.24) MPa and (349.64±54.72) MPa, respectively. CONCLUSIONS: The ZTA dental ceramics exhibit good machinability with proper sintering temperature (1200℃) and the strength meets the requirement of clinical application.

Key words: Zirconia toughened alumina, Gel-casting, Sintering temperature, Mechanical properties, Machinability

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