The effects of artificial aging on high translucent zirconia. Issue 1 (20th December 2019)

• Record Type: Journal Article
• Authors: Kou, Wen; Garbrielsson, Klas; Borhani, Adrian; Carlborg, Markus; Molin Thorén, Margareta
• Is Part Of: Biomaterial investigations in dentistry. Volume 6:Issue 1(2019)
• Page Start: 54
• Page End: 60
• Publication Date: 2019-12-20
• Subjects: High translucent zirconia -- 5Y-PSZ -- aging -- biaxial flexural strength -- transparency -- surface roughness; Dental materials -- Periodicals; Dentistry -- Periodicals; Biomedical and Dental Materials; Periodical; 617.695
• DOI: 10.1080/26415275.2019.1684201
• Languages: English
• ISSNs: 2641-5275

Abstract

Abstract: Zirconia is known for its high strength but lacking translucency. Recently, a new type of high translucent zirconia, 5 mol% yttria partially stabilized zirconia (5Y-PSZ), with a larger fraction of cubic zirconia phase has become commercially available. However, the resistance to aging of these commercially available zirconia materials is not yet fully established. Purpose: The aim of the present study was to analyze the effects of artificial aging on surface roughness, transparency, phase transformation and biaxial flexural strength of two 5Y-PSZ products, DD cubeX 2 and Prettau Anterior. Materials and methods: The artificial aging was performed in an autoclave under 2 bars of pressure at 134 °C for 10 hours, which is estimated to correspond to 30–40 years in vivo . Artificial aging for 10 hours had no significant effect on surface roughness, transparency, or phase transformation for either of the tested materials. Results: DD cubeX 2 had higher mean flexural strength than Prettau Anterior both before and after artificial aging for 10 hours ( p < .05). DD cubeX 2 showed, however, a significant reduction in flexural strength after artificial aging ( p < .05), whereas Prettau Anterior showed a slight increase in flexural strength after artificial aging but not at a significant level. Conclusion: Within the limitation of the present study, both DD cubeX 2 and Prettau Anterior seems to be relatively resistant to aging. However, a wider range of measured flexural strength indicated that Prettau Anterior probably is a less stable material than DD cubeX 2, which also means that the flexural strength of DD cubeX 2 could be more predictable.