Influence of piston material on the fatigue behavior of a glass-ceramic

Effect of the type of resin cement on the fracture resistance of chairside CAD-CAM materials after aging

“…On the contrary, if the restorative material has a greater elastic modulus that the substrate, such as PICN material (E = 37.4 GPa), 7 high tensile stresses are located at the intaglio surface due to the substrate flexure under compressive loading, generating radial cracks. 11 30 33 Nevertheless, studies have shown that radial and cone cracks are competing failure modes. 11 18 28 30 32 33 Factors including the load level used in the mechanical test; 30 32 33 thickness of the substrate, cement and restorative material; 28 33 type of material, size and shape of the loading piston; 30 32 33 and, type of supporting substrate 11 28 33 can affect the stress distribution and failure mode of bonded structures as well.…”

“… 11 30 33 Nevertheless, studies have shown that radial and cone cracks are competing failure modes. 11 18 28 30 32 33 Factors including the load level used in the mechanical test; 30 32 33 thickness of the substrate, cement and restorative material; 28 33 type of material, size and shape of the loading piston; 30 32 33 and, type of supporting substrate 11 28 33 can affect the stress distribution and failure mode of bonded structures as well. Moreover, mechanical aging can also contribute to accumulate damage at the contact surface, resulting in combined failure modes.…”

“…G10 is a fiber-reinforced epoxy resin with elastic and adhesive properties similar to dentin. 11 18 30 31 Acid etching is recommended to produce micro retentions for adhesive bonding. 31…”

“…Cementation of the restorative materials to the dentin analog substrate followed the same protocol described for the σ f specimens reported previously ( Table 1 ). 11 18 30 Cemented specimens were stored in distilled water at 37℃ for 48 hr.…”

“…Cracks were classified as: radial, when initiating from the intaglio surface of the restorative material; cone, which are ring-shaped cracks initiating from the surface of the restorative material in contact with the loading piston; and combined, when both radial and cone cracks are identified. 11 18 30 33 …”