Hannover 2010 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 9: Poster: Plasmatechnology
P 9.7: Poster
Dienstag, 9. März 2010, 16:00–18:00, Lichthof
Surface modification of zircon oxide ceramics by an atmospheric plasma jet — •Antje Lehmann1, André Rueppell1, Stefan Rupf2, Matthias Hannig2, and Axel Schindler1 — 1Institut für Oberflächenmodifizierung e.V., Permoserstr. 15, 04318 Leipzig — 2Universitätsklinikum des Saarlandes, Klinik für Zahnerhaltung, Parodontologie und Präventive Zahnheilkunde, 66421 Homburg/Saar
Zircon oxide ZrO2, a hard, corrosion resistant, bio-compatible with high flectional strength. Therefore, it is widely used dentistry. Problems exist with the bonding between the ZrO2 surface and adhesive resin cement. In this work atmospheric plasmas treatment has been used to modify polished ZrO2 surfaces to enhance their wettability as an approach to improve the unsatisfactory bonding mentioned. We used a pulsed 2.45 GHz microwave driven plasma jet of an average power of lower than 10 W with helium as carrier gas. We observed strong increase of surface wettability and surface energy after plasma exposures with different gas mixtures (helium only and helium plus oxygen admixture), respectively, measured by the contact angle method. Furthermore, using XPS we measured an increase of the oxygen content from 57,9 at% to 63,9 at% and at the same time a decrease of carbon from 17,9 at% auf 8,1 at% at the surface after plasma jet treatment. This work is continued to optimize the plasma jet treatment by adjustment of plasma power and gas mixtures to vary reactive species produced in the jet, measured by mass spectrometry. The retentive strength will be finally measured by means of pull-off tests using zircon oxide parts and resin cement including surface roughness variation.