veneering external layer of the structure. Delamination and chipping of veneering porcelain from the underlying ceramic

CAD/CAM (computer aided design/computer aided manufacturing) processing or zirconia frameworks and overpressing of the veneer are modern methods available to achieve all-ceramic bilayered crowns. Besides materials strength, other factors affect restorations’ clinical longevity, such as prosthesis design and technological steps. The aim of the study is to display alternative modern technologies for the fabrication of all-ceramic molar crowns with various zirconia frameworks. The individual processing procedures could cause structural flaws. The structural flaws may be located in the framework, at the veneer–core interface, at the surface, in the bulk of the veneering material, and lead to stress concentration as well as act as fracture initiation sites. An innovative modality for the improvement of all-ceramic restorations in the posterior areas might be the possibility to use glass ceramics as veneering material for zirconia cores and to adjust framework designs. Individual processing procedures are responsible for structural flaws. Keywords—CAD/CAM, framework design, molar crowns, overpressing ceramics.