Ageing of Zirconia Dedicated to Dental Prostheses for Bruxers Part 1: Influence of Accelerating Ageing for Surface Topography and Mechanical Properties

Abstract

BACKGROUND: Zirconia is a commonly used ceramic for fixed full-ceramic restorations. Porcelain-fused-to-metal restorations applied for bruxers are often very quickly destroyed by this group of patients. OBJECTIVE: The aim of this study was to investigate the influence of accelerated aging tests on BruxZir HT 2.0 zirconia. METHODS: Zirconia samples were prepared with ISO 13356:2013 and ISO 14704:2008 protocol recommendations. The ageing conditions were times of 2.5, 5 and 10 hours, and pressure of 0.2 MPa and a temperature of 134°C. RESULTS: The correlation between ageing time and mechanical properties, particularly hardness, was difficult to find, while correlations between hardness and the surface topography and fracturing were clear. CONCLUSION: On the basis of the conducted research, it can be stated that BruxZir HT 2.0 zirconia meets the technical requirements for medical grade zirconia used in dental technology. Future investigations should include phase composition research.

Conversion of sub-µm calcium carbonate (calcite) particles to hollow hydroxyapatite agglomerates in K2HPO4 solutions

“…The OH ions will be supplied via water dissociation equilibrium when they are consumed at the reaction front. Such a scheme is compatible with the apparent activation energy of the net conversion reaction and apparent activation energy of H 2 PO 4 ion diffusion in aqueous solution [37,[43][44][45]. In both cases in Figure 10(c and d), HAp grows inwardly as in the case of HAp nano-rod array grown on sodium calcium silicate glass substrate which were soaked in 0.01 M Na 2 HPO 4 solution [46][47][48][49].…”

Surface modification methods of ceramic filler in ceramic-carbon fibre composites for bioengineering applications – A systematic review

“…The authors' own experience regarding the ZrO 2 resistance to the so-called low-temperature degradation shows that only doping of metastable ZrO 2 phases or applying active coatings can be a solution to the problem of destruction of ceramics in the body environment [92][93][94]. Beverages enriched with various acids, such as tartaric acid, malic acid, lactic acid, ascorbic acid, citric acid, and phosphoric acid have a strong destructive effect on teeth surface and dentures made from ceramics [91]; what is more, bruxism could be destructive for dentures [95] as well.…”

PICN Nanocomposite as Dental CAD/CAM Block Comparable to Human Tooth in Terms of Hardness and Flexural Modulus

“…In materials science, contemporary CAD/CAM blocks are categorized into three groups, namely metal-based (e.g., titanium alloy [ 4 ] and Co-Cr alloy [ 5 ]), ceramic-based (e.g., feldspathic porcelain [ 6 ], lithium disilicate glass [ 7 ] and zirconia [ 8 ]), or resin-based (e.g., acrylic resin [ 9 ] and resin composite (hereafter composite) [ 10 ]). An investigation of new composites already in use (e.g., poly(ether-ether-ketone) (PEEK) [ 11 ]) and some interesting research on new materials with hierarchized geometry [ 12 ] and biomechanical problems [ 13 , 14 , 15 ] (i.e., bruxism) have also been conducted thus far.…”