Materials Science

Abstract

Eleven porcelain-fused-to-metal bond tests were analyzed for interfacial shear stress distribution using finite-element stress analysis. Stress concentration effects are significant in ten of the 11 tests. A high probability of tensile failure within porcelain or the interfacial region was found in eight of the 11 tests analyzed.

Influence of artificial accelerated ageing on the colour stability of paints used for ocular prosthesis iris painting

“…Nevertheless, there was no statistically significant difference between the blue and brown colours and the other types of paints. Although CR group is also a polymer, the monomer conversion is greater and therefore there is less interaction with the acrylic polymer and less chromatic variation 15,16 .…”

Hot pressing effect on the shear bond strength of dental porcelain to CoCrMoSi alloy substrates with different surface treatments

“…Among the most common mechanical tests are the shear test, the Schwickerath crack initiation test used in ISO 9693:1999, the three-point-flexure test, the four-point-flexure test and the biaxial flexure test. The shear bond strength test results are characterized by not being influenced by the Young's Modulus of the alloy as happens for bending tests [17,18] and by its suitability for evaluation of metal-ceramic bonds [19]. Special attention must be paid to the device configuration because it can largely influence results.…”

Influence of preoxidation cycle on the bond strength of CoCrMoSi–porcelain dental composites

“…Several tests have been used to assess metalceramic bond strength, namely the Schwickerath crack initiation test used in ISO 9693:1999, the three-point-flexure test, the four-pointflexure test, the biaxial flexure test, etc. However, based on literature data, all of them show great variability in the mean bond strength values with large standard deviations [3,32,33]. The planar interface shear bond strength test used in this study is not influenced by the Young's modulus of the alloy as happens in bending tests and is considered to be suitable for evaluation of metal-ceramic bonds [32,34].…”