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Quantifying the Strength of a Resin-coated Dental Ceramic

¹ Biomaterials Unit, University of Birmingham School of Dentistry, St. Chad’s Queensway, Birmingham B4 6NN, UK; and
² Materials Science Unit, Division of Oral Biosciences, Dublin Dental School & Hospital, Trinity College Dublin, Ireland

View larger version (118K): [in this window] [in a new window]   Figure 1. Representative surface electron micrographs (i), cross-sectional electron micrographs (ii), and 3D profilometry traces (iii) of the polished (a), polished-indented (b), and 50-µm alumina-particle air-abraded dentin porcelain surface (c), with representative 2D traces derived from the superimposition of all 1251 individual mapping traces of the 3D areas examined. Profilometry traces were performed with a 90° conisphere stylus tip of 2 µm radius, across a 3 mm2 area coincident with the center of the specimen, producing 1251 traces with a 4-µm step size. Measurements were analyzed at a stylus velocity of 100 µm/sec, and datapoints were recorded every 10 µm.

View larger version (7K): [in this window] [in a new window]   Figure 2. The impact of increasing resin cement thickness on the bi-axial flexure strength of groups of porcelain disc-shaped specimens (n = 30) possessing controlled surface preparations. (a) Plot of the mean bi-axial flexure strengths and associated standard deviations of the uncoated polished dentin porcelain [75.4 (11.8) MPa, Group A] and Rely-XTM Veneer Cement-coated polished porcelain surfaces with increasing coating thicknesses (Groups B–E). The additional unfilled datapoints (groups D and E) refer to the mean bi-axial flexure strengths including specimens delaminating prior to failure. (b) Plot of the mean bi-axial flexure strengths and associated standard deviations of the uncoated polished-indented dentin porcelain [60.4 (10.6) MPa, Group F] and Rely-XTM Veneer Cement-coated polished-indented porcelain surfaces with increasing coating thicknesses (Groups G–J). (c) Plot of the mean bi-axial flexure strengths and associated standard deviations of the 50-µm alumina-particle air-abraded dentin porcelain [92.0 (7.0) MPa, Group K] and Rely-XTM Veneer Cement-coated polished surfaces with increasing coating thicknesses (Groups L–O). Vertical and horizontal error bars illustrate the standard deviations of the mean bi-axial flexure strengths and mean resin cement thickness, respectively.

Journal of Dental Research, Vol. 87, No. 6, 542-547 (2008)
DOI: 10.1177/154405910808700610


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