Low-temperature degradation of high-strength Y-TZP (yttria-stabilized tetragonal zirconia polycrystal)

被引:13
作者
Furuya, Katsunori [1 ]
Takemoto, Shinji [2 ]
Yamashita, Shuichiro [1 ]
Sekine, Hideshi [3 ]
Yajima, Yasutomo [4 ]
Yoshinari, Masao [5 ]
机构
[1] Tokyo Dent Coll, Dept Removable Partial Prosthodont, Chiyoda Ku, 2-9-18 Kandamisaki Cho, Tokyo 1010061, Japan
[2] Iwate Med Univ, Dept Biomed Engn, 1-1-1 Idaidori, Yahaba, Iwate 0283694, Japan
[3] Ohu Univ, Sch Dent, Dept Prosthet Dent, 31-1 Misumido, Koriyama, Fukushima 9638611, Japan
[4] Tokyo Dent Coll, Dept Oral & Maxillofacial Implantol, Chiyoda Ku, 2-9-18 Kandamisaki Cho, Tokyo 1010061, Japan
[5] Tokyo Dent Coll, Oral Hlth Sci Ctr, Chiyoda Ku, 2-9-18 Kandamisaki Cho, Tokyo 1010061, Japan
基金
日本学术振兴会;
关键词
High strength Y-TZP; HIP treatment; Alumina content; Biaxial flexural strength; Crystal phase; BIAXIAL FLEXURAL STRENGTH; FIXED DENTAL PROSTHESES; HYDROTHERMAL DEGRADATION; FRACTURE-TOUGHNESS; NANOCOMPOSITE; RESISTANCE; CERAMICS; SURVIVAL; FAILURE;
D O I
10.4012/dmj.2019-090
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
The objective of this study was to investigate the low temperature degradation characteristics of 2 types of high strength yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) in order to evaluate its suitability for implant body, implant superstructure or abutment. Disk-shaped conventional Y-TZP (0.25 mass% alumina) subjected to hot isostatic press treatment (HIP-Y-TZP) and Y-TZP/4Al(2)O(3) with additional alumina (4.0 mass%) were mirror-polished. Accelerated aging tests with 134 degrees C for 5 h at 0.2 MPa and 180 degrees C for 5 h at 1.0 MPa were performed using an autoclave. Biaxial flexural strength and crystal phases were evaluated. Strength decreased as the proportion of monoclinic phase increased after accelerated aging treatment for both types of high-strength Y-TZPs. Despite the low alumina content, HIP-Y-TZP showed higher static strength and strength after accelerated aging treatment compared to Y-TZP/4Al(2)O(3). However, both types of Y-TZP had adequate strength to be used as dental restorations even after accelerated aging treatment, therefore, its clinical suitability was considered high.
引用
收藏
页码:577 / 586
页数:10
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