Accessible Requires Authentication Published by De Gruyter May 26, 2013

Surface Structural Changes of Feldspathic Ceramics Before and After Immersion in a Corrosive Medium Using Atomic Force Microscopy

Rasterkraftuntersuchungen der Veränderungen der Oberflächenstruktur von Feldspat-Keramiken vor und nach Tauchversuchen in einem korrosiven Medium
Ketij Mehulić, Vesna Svetličić, Denis Vojvodic, Suzana Šegota, Zdravko Schauperl and Biserka Runje
From the journal Materials Testing

Abstract

Ceramics are attractive dental materials as a result of their supe- rior aesthetics and biocompatibility. However, they are brittle and prone to premature failure, especially at repeated contact strain and in moist environments. The chemical stability of dental ceramics is important, because it directly affects mechanical properties and aesthetic value of restorations.

The aim of this study was to investigate the effects of a corrosive agent, i.e. 4% acetic acid, on the surface of glazed and unglazed feldspathic ceramics. Metal-ceramic plates (9.0 × 9.0 × 1.2 mm) composed of a Ni-Cr alloy (Wiron 99, Bego Germany) and glazed or unglazed feldspathic ceramics (IPS Classic, Ivoclar-Vivadent, Schaan, Liechtenstein) were prepared according to the manufacturer‧s instructions. The samples were immersed in the solution at 80 °C and kept there for 16 h (ISO 6872). The surfaces of the samples before and after immersion in the corrosive medium were examined by atomic force microscopy (AFM). The pre- and post- corrosion AFM images of the surfaces of the feldspathic ceramics samples clearly show that the glazed surfaces are much less prone to deterioration by corrosion than the unglazed ones.

Kurzfassung

Keramiken sind attraktive Dentalmaterialien aufgrund ihrer überrragenden Ästhetik und Biokompatibilität. Sie sind jedoch spröde und anfällig gegen vorzeitiges Versagen, besonders unter wiederholter Kontaktdehnung und in feuchten Umgebungen.

Das Ziel der diesem Beitrag zugrunde liegenden Studie war es, die Auswirkungen eines korrosiven Agens, 4% Essigsäure, auf die Oberfläche glasierter und unglasierter Feldspatkeramiken zu untersuchen. Hierfür wurden Metall-Keramik-Platten (9,0 × 9,0 × 1,2 mm), die aus einer Nickel-Chrom-Legierung (Wiron 99, Bego, Deutschland) sowie glasierten und unglasierten Keramiken (IPS Classic, Ivoclar-Vivadent, Schaan, Liechtenstein) bestanden, nach den Anweisungen der Hersteller vorbereitet. Die Prüfstücke wurden für 16 Stunden der 80 °C heißen Lösung ausgesetzt (ISO 6872). Die Oberflächen der Prüfstücke wurden vor und nach den Tauchversuchen mittels Rasterkraftmikroskopie (AFM) untersucht. Die Bilder der Oberfläche der Feldspat-Keramiken vor und nach den Korrosionsversuchen zeigen klar, dass die glasierten Oberflächen wesentlich weniger gegen eine Schädigung infolge Korrosion ausgesetzt sind als die unglasierten.


Ketij Mehulić was born in Split, Croatia in 1963. She is Professor at the Department of Prosthodontics, School of Dental Medicine, University of Zagreb. As a student she was rewarded for her student‧s scientific papers. She graduated at the same University in 1988. She defended her Master Science thesis in 1992 and in 1996 her PhD thesis. She has been a principal investigator at the Project 065-0650446-0435 “Research of ceramic materials and allergies in prosthodontic”, which has been funded from the Ministry of Science of Croatia since 2007. She has been lecturing and teaching at post-graduate study, as well as at courses of permanent education. She is a member of the Croatian Medical Society, the Croatian Prosthodontic Society, and the Croatian European Prosthodontic Association. She was a supervisor in more than 20 graduate student‧s theses, 5 Master Science theses. She has published more than 60 scientific and professional papers. Her research interests involve dental materials especially dental ceramics.

Vesna Svetličić was born in Zagreb, Croatia in 1949. She is a research adviser and a head of the Laboratory for Bioelectrochemistry and Surface Imaging at the Rud-er Bošković Institute, Zagreb. She received her B. Sc. degree in 1973 from the Faculty of Chemical Engineering, University of Zagreb, her M. Sc. degree in 1976 and her PhD in 1984. She is a principal investigator at the Project 098-0982934-2744 “Surface forces on atomic scale applied in marine science and nanotechnology“, funded by the Ministry of Science, Education and Sports of the Republic of Croatia. She is co-chair of the Doctoral Programme of Biophysics at the University of Split and the coordinator of AFM facility at Rud-er Bošković Institute. She was a visiting professor at University of Minnesota, Minneapolis, USA, and a guest scientist at the Universite P. et M. Curie, Paris, and at the University of California, San Diego, USA. She is a member of the American Chemical Society, Union of Pure and Applied Biophysics and the president of The Croatian Biophysical Society. She is author of over 60 scientific papers in internationally reviewed journals in the fields of surface and colloid chemistry, biophysics, and material sciences.

Denis Vojvodić, born 1963, is Professor at the Department for Prosthetic Dentistry at the School of Dental Medicine, University of Zagreb. He received his MSc degree in 1992 and his PhD degree in 1996. Since 1995, he works as licensed prosthodontist in the clinical hospital “Dubrava” in Zagreb. He is court appointed examiner for dentistry since 1999. His fields of interest are dental materials and prosthetic rehabilitation of orofacial deformities. He made scientific and professional visits to the University of Nijmegen, and the University of Zurich. He is member of the New York Academy of Sciences, the European Prosthetic Association, the Croatian Medical Association and many others.

Suzana Šegota obtained her PhD from the University of Zagreb 2003 in the field of physical chemistry of colloids and self assembly processes in solution. At present, she is continuing her working at the Rud-er Bošković Institute, Zagreb, where she is additionally working on the characterization of the association of colloids nanostructures and interfaces.

Zdravko Schauperl, born 1964, received his B.Sc. and M. Phil. degree in Mechanical Engineering from the University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture (FSB), in 1989 and 1996 respectively. In November 2000, he obtained his PhD degree. Since September 1991, he works at the FSB at the University of Zagreb. He is Assistant professor since 2004 for the subject Materials Science and Engineering and Materials Characterization.

Biserka Runje, born 1962, graduated at the Faculty of Mechanical Engineering and Naval Architecture (FSB) at the University of Zagreb in 1986. Since 1987 she has been working at the Laboratory for Precise Measurement of Length, Department of Quality and Control of the FSB. She acquired her MSc degree in 1997 at the FSB, University of Zagreb, and her Doctor degree in 2002. Since 2005, she works as an Assistant Professor. Her scientific work includes research in the field of metrology of surface roughness and research in the field of nano-metrology as well as in the field of quality management.


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Published Online: 2013-05-26
Published in Print: 2010-04-01

© 2010, Carl Hanser Verlag, München