Marginal discrepancy and load to fracture of monolithic zirconia laminate veneers: The effect of preparation design and sintering protocol

To investigate and analyze the impact of teeth preparation designs sintering protocol on marginal fit fracture resistance monolithic translucent zirconia laminate veneers. A total 40 extracted intact human maxillary central incisors were assigned into 4 groups (n=10/each group) to 2 variables: (1) design tooth (a 1.5 mm incisal reduction with or without palatal chamfer) (2) two different programs used for restoration (standard speed procedure). Marginal discrepancy was evaluated using a digital microscope. The specimens loaded failure in compression mode, universal testing machine crosshead 0.5 mm/min. adaptation laminates are affected by both protocol. However, has mainly procedure regardless used.