Abstract
Statement of problem. Increasing the opacity of porcelain laminates is one of the techniques most commonly used to mask the color of darkly stained teeth. Purpose of study. Two different brands of porcelain (Fortune and Optec) disks that contained various amounts of modifying porcelains to alter opacity were cemented with untinted resin cement to a dark colored substrate. Material and methods. The color of the substrate was measured before and after cementation and the change in color was calculated. Results. Fortune porcelain showed a progressive increase in the amount of change produced as the modifying porcelain was increased, whereas Optec porcelain showed a decrease in the amount of change as modifying porcelain was increased. Conclusion. A progressive increase of yellow was exhibited in the samples as the amount of opacity is increased. (J Prosthet Dent 1997;77:136-40.)
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