Contamination of dental zirconia before final firing: Effects on mechanical properties

被引：11

作者：

Ban, Seiji ^{[1
]}

Okuda, Yuji ^{[2
,3
]}

Noda, Makoto ^{[3
]}

Tsuruki, Jiro ^{[4
]}

Kawai, Tatsushi ^{[1
]}

Kono, Hiroshi ^{[4
]}

机构：

[1] Aichi Gakuin Univ, Sch Dent, Dept Dent Mat Sci, Nagoya, Aichi 464, Japan

[2] Aichi Gakuin Univ, Sch Dent, Ctr Adv Oral Sci, Nagoya, Aichi 464, Japan

[3] Univ Implant Res Inst, Tokyo, Japan

[4] Kagoshima Univ, Grad Sch Med & Dent Sci, Kagoshima 890, Japan

来源：

DENTAL MATERIALS JOURNAL | 2013年 / 32卷 / 06期

基金：

日本学术振兴会;

关键词：

Zirconia; Contamination; Sintering; Pre-sintered block; Mechanical property; BIAXIAL FLEXURE STRENGTH; HEAT-TREATMENT; NANOCOMPOSITE; INVESTMENTS;

D O I：

10.4012/dmj.2013-222

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

Plate-like specimens were prepared, using a diamond saw, from Cercon -a pre-sintered yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) block. These specimens were treated with 10 kinds of dental materials which acted as contaminants, and then sintered at 1,350 degrees C or 1,450 degrees C. After the final firing, specimens were subjected to a three-point flexural test and Vickers hardness test. Their surfaces were also characterized by scanning electron microscopy and X-ray diffractometry. Phosphorus-containing contaminants reduced the three-point flexural strength and hardness of final sintered zirconia due to the formation of YPO4 and phase transformation from tetragonal to monoclinic zirconia. Gypsum also reduced both mechanical properties due to the formation of CaZrO3 and phase transformation from tetragonal to cubic zirconia. Other contaminants showed no adverse effects on the mechanical properties of final sintered zirconia.

引用

页码：1011 / 1019

页数：9

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