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Stress maps showing the maximum principal stresses for the different crowns' constructive designs: (a) Bilayered: sharp transition between framework and veneer; (b) Trilayered: interlayer of constant composition (porcelain volume fractions of 30%) between framework and veneer; and (c) Trilayered: compositionally stepwise graded interlayer between framework and veneer. Interlayer thickness was 0.75mm.
