The Color Differences Between Different Thicknesses of Resin Veneered Over Amalgam

Abstract

Statement of Problem Composites and compomers are popular in dental practice. However, little is known about their esthetic appearance as veneering restorative materials over amalgam restorations. Purpose This in vitro study was designed to assess the color differences of composite and compomer restorative materials, placed in thicknesses of 1 mm and 2 mm over amalgam. Material and Methods Thirty six cylindrical Teflon molds were filled with amalgam (13 mm diameter, 2 mm thickness) and stored at 37°C and 100% relative humidity for 7 days. Nine veneers (for each thickness of 1 and 2 mm) were fabricated from four types of tooth-colored restorative material, Dyract AP (DYR), Compoglass F (COMP), Herculite XRV (XRV), and Vitalecense (VIT), over amalgam specimens using Teflon-split molds and following the manufacturers’ instructions. A spectrophotometer was used to measure the color difference ΔE* between the two thicknesses. Results Color difference ΔE* values for 1 mm thickness veneers [XRV (2.52), Comp (5.46), VIT (6.73), and DYR (6.88)] were statistically significantly higher than the 2 mm thickness [XRV (1.32), Comp (3.24), VIT (4.89), and DYR (4.83)]. Although the XRV material had the lowest ΔE* values, no statistically significant difference was found between the two thicknesses. The color measurements at L*, a*, and b* showed most materials became darker in color at either thickness. Conclusion The thicker veneer specimens were found to be closer in color to the controls than the thinner specimens. Only XRV had color differences (ΔE*) small enough to be considered clinically acceptable (2.52 and 1.32 at 1 mm and 2 mm, respectively). Clinical Implications In this in vitro study the color of XRV was affected the least when veneered on amalgam. Opaquers may be needed to be used with thinner veneers to minimize the effect of amalgam background. Citation Al-Jazairy YH, El-Hejazi AA. The Color Differences Between Different Thicknesses of Resin Veneered Over Amalgam. J Contemp Dent Pract 2005 November;(6)4:038-045.

The effect of bleaching, varying the shade or thickness of composite veneers on final colour: An in vitro study

“…21,22,42 Thin composites contain less filler particles, therefore more background light is reflected increasing the impact of the background shade. Hence the advantage of bleaching prior to placing a veneer can be seen.…”

“…The background colour is known to affect the overall shade of a composite resin, even at a thickness of 2 mm. 21,22 while the light absorbing and internal reflecting properties of the composite alter the amount of background effect. 23 The more translucent a composite, the more effect the background colour has.…”

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“…21 The background color is known to affect the overall color of a composite resin, [21][22][23][24][25] even at a thickness of 2 mm. 25,26 In A N D order to eliminate any doubt that the backing was influencing the overall shade, we measured the layering technique over both WB and BB.…”

The Optical Behavior of Nano Filled Resin Composite Loaded With Graphene Oxide Nanoparticles

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