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Hydrolytic Degradation of Dental Composites
K.-J. Söderholm
Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610
M. Zigan
Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610
M. Ragan
Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610
W. Fischlschweiger
Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610
M. Bergman
Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610
The leakage of filler elements from four composites after storage in water was investigated by use of atomic absorption spectrophotometry. The results confirmed previous findings that leaching of silicon from different composites is strongly dependent on filler composition. Consideration of the total filler surface of each composite material indicated that quartz as well as pyrolytic silica-containing composites leached less silicon than did composites containing fillers of strontium and/or barium glasses. A correlation between leakage and crack formation in the matrix appeared to exist for all composites except for the microfilled resin. These cracks were explained as a result of osmotic pressure built up at the matrix-filler interface due to hydrolytic degradation of the filler.
Of the investigated materials, the microfilled resin was found to be the most stable material in a wet environment with respect to crack formation. This finding was explained by filler composition, filler form, and the specific structure of the microfilled resin.
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Journal of Dental Research, Vol. 63, No. 10,
1248-1254 (1984)
DOI: 10.1177/00220345840630101701
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