Reinforced porcelain system: A new concept in ceramometal restorations

Fatigue life and failure modes of crowns systems with a modified framework design

“…[35][36][37][38] These modified designs were never tested clinically, perhaps due to the general anecdotal awareness that MC restorations success rates are high. Indeed, our results showed the highest fatigue values for MC crowns, but no differences between standard versus modified designs.…”

Conventional and Modified Veneered Zirconia vs. Metalloceramic: Fatigue and Finite Element Analysis

“…Engineering parameters and their relationship to clinical longevity deserve further investigation 10 . For instance, in an attempt to improve clinical performance of all‐ceramic layered structures, core designs reinforcing the centric holding cusps have been attempted and are based on empirical metal ceramic restoration (MCR) work from the 1980s 11–14 . These anecdotal and empirical substructure design modifications have not been appropriately tested in controlled settings.…”

“…10 For instance, in an attempt to improve clinical performance of all-ceramic layered structures, core designs reinforcing the centric holding cusps have been attempted and are based on empirical metal ceramic restoration (MCR) work from the 1980s. [11][12][13][14] These anecdotal and empirical substructure design modifications have not been appropriately tested in controlled settings. Similarly, attempts to improve FPD 6,8 longevity have not been verified in the laboratory.…”

Thermal/mechanical simulation and laboratory fatigue testing of an alternative yttria tetragonal zirconia polycrystal core‐veneer all‐ceramic layered crown design

“…Changing the design of the core has been a heuristic process proposed for metal ceramic crowns (38–41) that has never been evaluated in clinical controlled trials, perhaps because the survival rates are known to be high in such systems (42). Porcelain veneered zirconia failures have led to concerns regarding adequate porcelain support (22), differences in the CTE between the core and the veneering porcelain and their respective processing techniques (4), the unknown clinical implications of tetragonal to monoclinic phase transformation observed at the Y‐TZP/veneer interface (43), or the low thermal diffusivity of zirconia compared with alumina or metal (44).…”