Effect of Dispersant Agent Amount in Colloidal Processing of Zirconia Dental Ceramic

Abstract

The effects of a polyelectrolyte dispersant agent, polyethyleneimine (PEI), on the rheology of zirconia 3Y-TZP suspensions and the densification characteristics of sintered zirconia were investigated. The colloidal processing technique was used to minimize the agglomeration of nanoparticles during the fabrication of the samples. Five batches of 10% zirconia suspensions containing different amounts of PEI at 0.3, 0.4, 0.5, 0.6, and 0.7 wt% were prepared. The rheological properties of the zirconia suspensions were determined using a rotational viscometer. The optimum amount of PEI that can maximize powders dispersion was determined. The green samples were then prepared using the slip casting process. The samples were densely sintered at a final sintering temperature of 1300 °C. The result revealed that the zirconia suspension with 0.5 wt% PEI was the most optimum amount to obtain a well-dispersed suspension. The sintered density of zirconia 3Y-TZP reached its maximum by adding 0.5 wt% PEI.

Zirconia based dental ceramics: structure, mechanical properties, biocompatibility and applications

“…3 shows a tooth crown fabricated from a pre-sintered zirconia core, which was milled using CAD/CAM (Cercon, Dentply). 29 Different important mechanical, thermal and electrical parameters of zirconia are listed in Table 1. 29…”

“…29 Different important mechanical, thermal and electrical parameters of zirconia are listed in Table 1. 29…”

“…Fig.3Representation of the (a) milling process of zirconia Cercon; (b) the core of zirconia Cercon 29. …”

Nanostructured Zirconia-Based Ceramics and Composites in Dentistry: A State-of-the-Art Review

“…It is important to point out that, even though the research activity on ceramic nanomaterials was intense in the last 14 years and zirconia nanopowders are widely commercially available, only a very few studies were successful in developing fully dense zirconia-based products with grain size below or not too far from 100 nm. Some of these studies [10,16,17,27,37,41,45,46,52,66,67] are based on the use of conventional or adapted shaping and sintering techniques, such as slip casting, uniaxial pressing, cold isostatic pressing, powder injection molding, hot isostatic, pressing followed by conventional sintering or two step sintering. The two step sintering method, in particular, originally developed by Chen and Wang [82], seems to be specifically suitable for the densification of nanostructured ceramics since it limits the grain growth.…”

“…Figure 1 reports a subdivision of the papers on the basis of the grain size of the developed final products: For the elaboration of Figure 1, only the paper reporting an experimental procedure to produce nanozirconia-made components were considered. In Figure 2, the geographical provenience of all the 74 analyzed scientific papers [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,…”