Chai H, et al. - For this research, the physicians explored the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused porcelain/zirconia (P/Z). For dental restorations, increased resistance to surface damage and good esthetic quality, graded zirconia emerged as a viable material concept, combined with its improved bonding to resin-based cements.