This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Ferracane, J.L. Articles by Marker, V.A. Search for Related Content PubMed PubMed Citation Articles by Ferracane, J.L. Articles by Marker, V.A. Pubmed/NCBI databases Compound via MeSH Substance via MeSH Hazardous Substances DB 2,6-DI-T-BUTYL-P-CRESOL ETHANOL TRIETHYLENE GLYCOL DIMETHACRYLATE Social Bookmarking                         What's this?

Solvent Degradation and Reduced Fracture Toughness in Aged Composites

Department of Dental Materials Science, Oregon Health Sciences University, 611 S.W. Campus Drive, Portland, Oregon 97201

V.A. Marker

Department of Dental Materials, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, Texas 75246

Quartz- and barium-glass-filled composites aged for more than one year in ethanol experienced a significant reduction in fracture toughness (K_Ic), essentially identical to that experienced after two months of aging. This reduction is mainly attributed to a softening of the resin matrix, but cracking within the resin and at the filler/ matrix interface, as revealed by SEM microscopy, may also have contributed. No significant cracking could be seen in the composites aged in water. Composites post-cured at temperatures approaching their glass-transition temperature also experienced a reduction in K_Ic after alcohol storage. Storage in water for one year had little effect on the K_Ic of composites cured at oral temperatures, but a significant increase was observed for those post-cured at elevated temperatures. This increase is difficult to explain, but appears to involve a filler/matrix interfacial phenomenon, because it was not observed in the unfilled resin. The results of this study demonstrate that an alteration in the fracture resistance and some degradation of the filler/matrix interface, as has been observed clinically, occur after long-term exposure of dental composites to certain solvents used as food-simulating liquids.

Journal of Dental Research, Vol. 71, No. 1, 13-19 (1992)
DOI: 10.1177/00220345920710010101


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				Influence of Food Simulating Solutions on the Hardness of Composite Resins Journal of Composite Materials, January 1, 2008; 42(1): 69 - 75.

				S. B. PATEL, V. V. GORDAN, A. A. BARRETT, and C. SHEN The effect of surface finishing and storage solutions on the color stability of resin-based composites J Am Dent Assoc, May 1, 2004; 135(5): 587 - 594. [Abstract] [Full Text] [PDF]

				H.H.K. Xu Dental Composite Resins Containing Silica-fused Ceramic Single-crystalline Whiskers with Various Filler Levels Journal of Dental Research, July 1, 1999; 78(7): 1304 - 1311. [Abstract] [PDF]

				J.L. Ferracane, J.C. Mitchem, J.R. Condon, and R. Todd Wear and Marginal Breakdown of Composites with Various Degrees of Cure Journal of Dental Research, August 1, 1997; 76(8): 1508 - 1516. [Abstract] [PDF]

				J.R. Condon and J.L. Ferracane In vitro Wear of Composite with Varied Cure, Filler Level, and Filler Treatment Journal of Dental Research, July 1, 1997; 76(7): 1405 - 1411. [Abstract] [PDF]