Effect of Accelerated Aging on the Color and Opacity of Resin Cements

Abstract

SUMMARY Statement of the Problem:The color stability of resin cements plays a major role in the esthetic performance of porcelain laminate veneers. Some dual-polymerizable resin cements used to bond porcelain laminates were shown to undergo color changes during service. Some recently produced cements are described as being color stable, but scientific data are not available. Clinical RelevanceWhile the studied cements behaved acceptably according to the color change index (∆E), they functioned differently in regards to opacity, especially the self-cure ones.

The effects of different shades of resin luting cement on the color of ceramic veneers

“…The inorganic fillers within the material represent a phase with a different refractive index from the bulk of the material, with subsequent scattering of light and different degrees of translucency 38) . Moreover, degree of chroma influences the translucency level, which, in turn, influences the final color as well: Low chroma shades were more translucent 39) .…”

Effects of artificial accelerated aging on the optical properties of resin composites

“…Ultraviolet light, temperature, and humidity are known to cause oxidation of amine (GHAVAM et al, 2010). The double bonds of aromatic amines may be a possible explanation for the yellowing of the resins, because these conjugated systems are capable of absorbing UV light, thereby creating a higher energy state.…”

Colour stability and opacity of resin cements and flowable composites for ceramic veneer luting after accelerated ageing

“…However, changes in the opacity of these materials have been scarcely investigated. 23 On one hand, the role of opacity on the aesthetic performance of ceramic veneers can rely on the ability of the cement to cover underlying tooth discolorations, on the other hand, it may render the restoration less lively. 23 Thus, it becomes relevant to investigate this optical property for adequate selection of luting agent, as well as its long-term evaluation by artificial ageing methods.…”