Understanding the microstructural bonding mechanisms between Y-TZP and veneering ceramic

牙科贴面氧化锆基核修复迄今已被广泛使用。氧化锆核与瓷贴面材料分层，以实现适当的美学效果。然而，氧化锆基瓷贴面可能会产生临床问题，如瓷贴面层的碎裂或断裂。先前的研究已经报道了单板失效的显著发生率，例如分层、碎裂和开裂。这种断裂行为可归因于差的单板/芯界面结合强度、芯材料与单板之间的弹性模量不匹配、芯与单板之间的热膨胀系数不匹配、弱的瓷强度和热过程（其可引入由冷却速率和/或高温烧结引起的残余应力）。为了改善瓷核界面的相容性，避免早期破坏，需要对瓷核/氧化锆界面有更深入的了解。

Dental veneered zirconia-based core restorations have been used widely to date. The zirconia core is layered with a porcelain veneer material to achieve suitable esthetics. However, zirconia-based restorations can create clinical issues such as chipping or fracture of the porcelain veneered layer. Previous studies have reported a significant incidence of veneer failures such as delaminations, chipping and cracking. This fracture behavior could be attributed to the poor veneer/core interface bond strength, elastic modulus mismatch between the core material and the veneer, coefficient of thermal expansion mismatch between the core and the veneer, weak porcelain strength and thermal procedure which could introduce residual stress induced by cooling rate and/or sintering at high temperatures. To improve the compatibility at the interface between veneer and core, and to avoid premature failure, the interface zirconia/porcelain should be better understood.