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Role of Core Support Material in Veneer Failure of Brittle Layer Structures by Ilja Hermann; Sanjit Bhowmick; Brian R. Lawn is a Medicine article available to read on EtoBox.

What is Role of Core Support Material in Veneer Failure of Brittle Layer Structures about?

## Abstract A study is made of veneer failure by cracking in all‐ceramic crown‐like layer structures. Model trilayers consisting of a 1 mm thick external glass layer (veneer) joined to a 0.5 mm thick inner stiff and hard ceramic support layer (core) by epoxy bonding or by fusion are fabricated for testing. The resulting bilayers are then glued to a thick compliant polycarbonate slab to simulate a dentin base. The specimens are subjected to cyclic contact (occlusal) loading with spherical indenters in an aqueous environment. Video cameras are used to record the fracture evolution in the transparent glass layer __in situ__ during testing. The dominant failure mode is cone cracking in the glass veneer by traditional outer (Hertzian) cone cracks at higher contact loads and by inner (hydraulically pumped) cone cracks at lower loads. Failure is deemed to occur when one of these cracks reaches the veneer/core interface. The advantages and disadvantages of the alumina and zirconia core materials are discussed in terms of mechanical properties—strength and toughness, as well as stiffness. Consideration is also given to the roles of interface strength and residual thermal expansion mismatch

Who reads Role of Core Support Material in Veneer Failure of Brittle Layer Structures?

Author

Ilja Hermann; Sanjit Bhowmick; Brian R. Lawn

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1552-4973)

Published

2007

Language

EN

Field

Medicine (Health Sciences)