Bonding Mechanism of Porcelain to Frameworks: Similarities and Dissimilarities between Metal and Zirconia

Zirconia restorations emerged as a substitute to metal ceramic restoration, in response to patients’ esthetics growing demand. The metal-porcelain bonding mechanism is well known; whereas, the zirconia-porcelain interface is still not fully understood. Several factors have been pointed to explain the high porcelain chipping incidence. This paper will review the latest findings in an attempt to explain the zirconia-porcelain bonding. Peer-reviewed articles published till September 2015 were identified through Pubmed and Elsevier databases. Similarities and differences between metal and zirconia have been raised in the literature.