Figure 1.

Illustrations of full-contour graded glass-zirconia restorations and load-slide action simulating molar tooth occlusal contact. (a) Esthetic superiority of glass/zirconia/glass (with external glass) crowns and fixed partial dentures over their monolithic Y-TZP counterparts. (b) A chewing cycle at the molar region involves an eccentric contact of the mandibular buccal cusps with the inner inclines of the maxillary buccal cusps, followed by a sliding movement through centric occlusion, and then liftoff. Arrow indicates sliding direction. (c) Experimental set-up for simplified mouth simulator with a straight-line motion of a spherical indenter on a flat layer, supported by a compliant substrate with an inclination angle θ.