Bonding measurement —Strength and fracture mechanics approaches

Abstract

This study investigated the effect of cross-sectional areas on interfacial fracture toughness and bond strength of bilayered dental ceramics. Zirconia core ceramics were veneered and cut to produce specimens with three different cross-sectional areas. Additionally, monolithic specimens of glass veneer were also prepared. The specimens were tested in tension until fracture at the interface and reported as bond strength. Fracture surfaces were observed, and the apparent interfacial toughness was determined from critical crack size and failure stress. The results showed that cross-sectional area had no effect on the interfacial toughness whereas such factor had a significant effect on interfacial bond strength. The study revealed that cross-sectional area had no effect on the interfacial toughness, but had a significant effect on interfacial bond strength. The interfacial toughness may be a more reliable indicator for interfacial bond quality than interfacial bond strength.

The Effect of Biodentine Maturation Time on Resin Bond Strength When Aged in Artificial Saliva

“…This is an inherent complication accompanying with SBS testing where raised tensile stress initiates below the site of load application while compressive stress generates on the opposing side [ 35 , 43 ]. Furthermore, the applied bonding layer might extend beyond the tested area changing the way of stress is distributed during testing which can affect test outcomes since the fractured zone is bigger than the interfacial zone assigned to calculate the SBS [ 35 , 44 , 45 ].…”