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Evaluation of degradation degree of dental hybrid composite used as permanent fillings
|Joanna E. Siejka - Kulczyk , Malgorzata Lewandowska , Krzysztof J. Kurzydlowski|
Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
The aim of this study was to evaluate the degradation process of dental hybrid composites used as permanent fillings. Bis – GMA resin was used as polymer matrix. Ceramic glass with various particle sizes as well as nanosilica were used as composite fillers. The specimens were stored in 0,1M NaOH for 6, 24 and 168h, and in water for 168h. Degradation was evaluated by Scanning Electron Microscopy (SEM) microstructure observation and mechanical testing, such as flexural strength, microhardness.
SEM investigation indicate that after the storage in NaOH solution, the resin is particularly dissolved and some filler particles are falled out. This leads to significant decrease of mechanical properties of ceramic – polymer composites intended for dental application.
Presentation: poster at E-MRS Fall Meeting 2005, Symposium E, by Joanna E. Siejka - Kulczyk
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-07-27 14:52 Revised: 2009-06-07 00:44