Effect of intermediate ceramics and firing temperature on bond strength between tetragonal zirconia polycrystal and veneering ceramics

Abstract

The purpose of the present study was to investigate the influence of the intermediate ceramics and firing temperature on bond strength between tetragonal zirconia polycrystal (TZP) and its intermediate ceramics. Two types of intermediate ceramics, defined as a ceramics placed between the TZP and its veneering ceramics, were used; one including high-strength lithium-disilicate (EP) or feldspathic liner porcelain (SB). The firing temperature of the intermediate ceramics was set at 930°C, 945°C or 960°C. Shear bond strength showed values of 35.8 MPa in SB and 54.9 MPa in EP at a firing temperature of 960°C. Electron probe microanalysis revealed that components of the intermediate ceramics remained on the TZP surface after debonding, indicating that fractures occurred in the intermediate ceramics near the TZP. These results indicate that the bond strength between and a TZP framework and its veneering ceramics could be improved by using a high-strength intermediate ceramics and a comparatively high firing temperature.

Effect of various intermediate ceramic layers on the interfacial stability of zirconia core and veneering ceramics

“…In this study, the veneering porcelain, the liner and the connector had compatible CTE values with that of the Y-TZP core. The intermediate ceramic layers such as liner or connector may increase the wettability of the core surface as well as compensate for the discrepancy in the thermal expansion behavior between the veneer and the substrate [17,19,20]. The wetting property is determined by the composition of the adhesive material, the morphology of the zirconia surface and the surface energy of the core [21].…”

Evaluation of mold-enclosed shear bond strength between zirconia core and porcelain veneer

“…The mean conventional SBS values reported for zirconia-porcelain combinations in the literature covered a range of 17-55 MPa 4,16,[37][38][39][40][41][42][43][44] . However, the mean ME-SBS values obtained in the present study ranged from 7-10 MPa, which are much lower than those for conventional SBS.…”

The impact of laser scanning on zirconia coating and shear bond strength using veneer ceramic material

“…In addition, zirconia cores for crown frameworks still require application of veneering ceramics, typically with specialized porcelain, to achieve optimum aesthetics 1) . Certain studies have reported the clinical failures of veneered zirconia FPDs due to veneer debonding, chipping, or fracture defects which were reported to be around 15% after 2-5 years 1,[5][6][7] . The adhesion between the zirconia substrate and veneer ceramics (v-c) is based on various factors such as chemical bonding, mechanical interlocking, wetting properties, interfacial stress, thermal expansion mismatch and glass transition temperature 1,8) .…”