Evaluation of the Bond Strengths between Dental Porcelain and Cobalt-Chromium Metal Frameworks Manufactured with Different Techniques after the Thermal Aging Process

Figure 4

SEM analysis of samples, each selected from one of the four groups with thermal cycling application, under ×1000 magnification: (a) conventional casting method; (b) CAD/CAM system; (c) EOS Laser sintering; (d) Concept Laser sintering.

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(b)

(c)

(d)