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Journal of Dental Research
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Biomaterials & Bioengineering

Joining Veneers to Ceramic Cores and Dentition with Adhesive Interlayers

J.J.-W. Lee, Y. Wang, I.K. Lloyd and B.R. Lawn1,*

Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-2115, USA; and
1 Materials Science and Engineering Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Bldg. 223, Gaithersburg, MD 20899-8520, USA

Correspondence: * corresponding author, brian.lawn{at}nist.gov

Adhesive joining of veneers to cores offers potential simplicity and economy in the fabrication of all-ceramic crowns. We tested the hypothesis that resin-based adhesives can be used for such fabrication without compromising mechanical integrity of the crown structure. A simple test procedure for quantifying this hypothesis was proposed. A model glass veneer layer 1 mm thick (representative of porcelain), adhesively bonded onto a glass-like core substrate (ceramic or dental enamel), was loaded at its top surface with a hard sphere (occlusal force) until a radial crack initiated at the veneer undersurface. The critical loads for fracture, visually observable in the transparent glass, afforded a measure of the predisposition for the adhesive to cause veneer failure in an occlusal overload. Two adhesives were tested, one a commercial epoxy resin and the other a relatively stiff in-house-developed composite. The results confirmed that stiffer adhesives provide higher resistance to failure.

Key Words: adhesive joining • glass • contact loading • veneer failure

Journal of Dental Research, Vol. 86, No. 8, 745-748 (2007)
DOI: 10.1177/154405910708600811
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