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Joining Veneers to Ceramic Cores and Dentition with Adhesive Interlayers

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

View larger version (13K): [in this window] [in a new window]   Figure 1. Schematic of glass/adhesive/glass layer system in contact loading, showing key variables.

View larger version (57K): [in this window] [in a new window]   Figure 2. Photograph showing contact-induced radial cracks at bottom surface of glass veneer layer of thickness d = 1.0 mm bonded to glass substrate with composite adhesive of thickness h = 100 µm, at initiation load P = 600 N. Side view, crack visible as elliptical shadow.

View larger version (21K): [in this window] [in a new window]   Figure 3. Plot of crack initiation load PR vs. interlayer thickness h in logarithmic coordinates for glass veneer of thickness d = 1.0 mm bonded to glass substrate with adhesive of modulus Ei = 2.3 GPa (epoxy) and 20.4 GPa (composite). Data points with error bars at interlayer thickness h = 150 µm are means and standard deviations for minimum of 6 specimens each. Other data points are individual test results. Number of specimens n = 60. Solid lines are fits from Eq. 1. Dashed lines are for hypothetical adhesives of modulus Ei = 10 GPa and 40 GPa.

View larger version (11K): [in this window] [in a new window]   Figure 4. Calculated values of crack initiation load PR as function of adhesive modulus Ei in logarithmic coordinates for all-glass veneer/substrate system bonded with adhesive of interlayer thickness h = 100 µm. Curves shown for selected veneer thicknesses d indicated.

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


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