Abstract
This study was performed to evaluate the effect of a lithium-disilicate spray-liner application on both the bond strength between zirconia cores and heat-pressed lithium-disilicate glass-ceramic veneers, and the fracture strength of all-ceramic zirconia crowns. A lithium-disilicate reinforced liner was applied on the surface of a zirconia core and lithium-disilicate glass-ceramic was veneered on zirconia through heat press forming. Microtensile and crown fracture tests were conducted in order to evaluate, respectively, the bonding strength between the zirconia cores and heat pressed lithium-disilicate glass-ceramic veneers, and the fracture strength of bilayered zirconia all-ceramic crowns. The role of lithium-disilicate spray-liner at the interface between zirconia and lithium-disilicate glass-ceramic veneers was investigated through surface and cross-sectional analyses. We confirmed that both the mean bonding strength between the zirconia ceramics and lithium-disilicate glass-ceramic veneers and the fracture strength of the liner-treated groups were significantly higher than those of the untreated groups, which resulted, on the one hand, from the chemical bonding at the interface of the zirconia and lithium-disilicate liner, and, on the other, from the existence of a microgap in the group not treated with liner.
Highlights
With the increase in patients’ demands for esthetic restoration, a variety of types of ceramic materials have been introduced to improve the esthetics of dental prostheses
In the untreated at the interface between the veneer and the 3Y-tetragonal zirconia polycrystals (TZP) core, we identified that a small reactive layer was group, at the interface between the veneer and the 3Y-TZP core, we identified that a small reactive generated on the 3Y-TZP surface (B1), whereas in the liner-treated group, a thick reactive layer formed layer was generated on the 3Y-TZP surface (B1), whereas in the liner-treated group, a thick reactive on the 3Y-TZP surface (B2)
Itatwas confirmed that the micro-gap dissipated after the linear treatment due to the chemical reaction the confirmed that the micro-gap dissipated after the linear treatment due to the chemical reaction at the confirmed that the micro-gap dissipated after the linear treatment due to the chemical reaction at the interfacebetween betweenzirconia zirconiacore coreand andveneering veneeringceramic ceramicduring duringthe theheat heatpress pressforming formingof ofthe theveneering veneering interface ceramics, as shown in
Summary
With the increase in patients’ demands for esthetic restoration, a variety of types of ceramic materials have been introduced to improve the esthetics of dental prostheses. Porcelain has several advantages, such as excellent esthetics, chemical durability, and a high compressive strength. Due to these advantages, it has been used in dental clinics as a form of porcelain jacket crown since 1887. Since opaque prostheses resulting from both the metal framework’s interference of light and the exposure of the margin of metal have been pointed out as the main factor in the degradation of dental esthetics, much attention has been paid to the all-ceramics restoration method, which solely uses ceramic materials with sufficient strength, superior biocompatibility, and penetrability of light [1,2]
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