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Load-bearing capacity of ceramics on enamel backed by dentin loaded with a deformable indenter (solid symbols) relative to a rigid indenter (open symbols). (a) Fracture loads for lithium disilicate (triangles) and zirconia (circles), and (b) fracture load ratio between lithium disilicate and zirconia as a function of ceramic thickness. Dashed line represents fracture load ratio for the two ceramics in freestanding flexure.
