Using Glass-graded Zirconia to Increase Delamination Growth Resistance in Porcelain/zirconia Dental Structures

Overview

Journal Dent Mater

Specialty Dentistry

Date 2017 Nov 30

PMID 29183670

Citations 2

Authors

Herzl Chai

Adam J Mieleszko

Stephen J Chu

Yu Zhang

Affiliations

Soon will be listed here.

Abstract

Objective: Porcelain fused to zirconia (PFZ) restorations are widely used in prosthetic dentistry. However, their tendency to delaminate along the P/Z interface remains a practical problem so that assessing and improving the interfacial strength are important design aspects. This work examines the effect of modifying the zirconia veneering surface with an in-house felspathic glass on the interfacial fracture resistance of fused P/Z.

Methods: Three material systems are studied: porcelain fused to zirconia (control) and porcelain fused to glass-graded zirconia with and without the presence of a glass interlayer. The specimens were loaded in a four-point-bend fixture with the porcelain veneer in tension. The evolution of damage is followed with the aid of a video camera. The interfacial fracture energy G was determined with the aid of a FEA, taking into account the stress shielding effects due to the presence of adjacent channel cracks.

Results: Similarly to a previous study on PFZ specimens, the fracture sequence consisted of unstable growth of channel cracks in the veneer followed by stable cracking along the P/Z interface. However, the value of GC for the graded zirconia was approximately 3 times that of the control zirconia, which is due to the good adhesion between porcelain and the glass network structure on the zirconia surface.

Significance: Combined with its improved bonding to resin-based cements, increased resistance to surface damage and good esthetic quality, graded zirconia emerges as a viable material concept for dental restorations.

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