Skip to main content
. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Dent Mater. 2009 Feb 1;25(6):781–790. doi: 10.1016/j.dental.2009.01.002

Figure 4.

Figure 4

Ceramic restorations are fully supported by and often bonded to a less stiff dentin. (a) Posterior tooth-to-tooth contact involves contact of the cusp’s inner incline with the opposing tooth cusp tip (r≈1 mm [33]); thus tensile stresses develop directly below the contact area (highlighted by the dashed grey circle). (b) Schematic of Hertzian indentation on flat ceramic/polymer bilayers to determine the resistance of ceramic plates to cementation surface radial cracking. (c) and (d) Bar charts showing critical loads for cementation surface radial cracking in ceramic plates, d = 1.5 mm and 0.4 mm respectively, on polycarbonate substrates. Ceramic plates are G/Z/G fabricated from glass infiltration of 1400°C presintered Y-TZP and the homogeneous Y-TZP controls. Note: the advantage of G/Z/G over homogeneous Y-TZP is more pronounced for thinner specimens.