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- Title
Low-temperature degradation of high-strength Y-TZP (yttria-stabilized tetragonal zirconia polycrystal).
- Authors
Katsunori FURUYA; Shinji TAKEMOTO; Shuichiro YAMASHITA; Hideshi SEKINE; Yasutomo YAJIMA; Masao YOSHINARI
- Abstract
The objective of this study was to investigate the low temperature degradation characteristics of 2 types of high strength yttriastabilized 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/4Al2O3 with additional alumina (4.0 mass%) were mirror-polished. Accelerated aging tests with 134°C for 5 h at 0.2 MPa and 180°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/4Al2O3. 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.
- Subjects
ISOSTATIC pressing; DENTAL fillings; FLEXURAL strength; ACCELERATED life testing; HOT pressing
- Publication
Dental Materials Journal, 2020, Vol 39, Issue 4, p577
- ISSN
0287-4547
- Publication type
Article
- DOI
10.4012/dmj.2019-090