Y-TZP, Ce-TZP and as-synthesized Ce-TZP/Al2O3 materials in the development of high loading rate digital light processing formulations
Résumé
Y-TZP, Ce-TZP and Ce-TZP/Al2O3 materials are widely investigated in dentistry. Digital Light Processing (DLP) is considered as a breakthrough technology for the dental field to fine print Y-TZP green parts. High loading photocurable formulations (>45 vol%) with Y-TZP , Ce-TZP commercial powders and Ce-TZP/30vol% Al2O3 as-synthesized powder suitable to DLP printing were achieved in this study. A low specific surface area (5-13 m²/g) of particles without any pores and 1 wt% to 2 wt% of steric dispersant are required to obtain high loading formulations. The as-synthesized composites provide these properties by increasing the calcination temperature from 800°C to 1200°C. The as-prepared ceramic formulations based on the same photocurable resin exhibit a curing behavior suitable to DLP process for Y-TZPformulations (thickness > 50 μm in few seconds with a high conversion rate) in comparisonwith ceria ceramic. The ceria is a strongly UV absorbing material and a specific formulationis developed to obtain 80% of conversion and a cured thickness of 75 μm in 0.5 s.
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