What is true about opaque porcelain in dental restorations?

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It is composed primarily of feldspathic glass.It includes opacifying agents such as zirconium and titanium oxides.It is not utilized to conceal the color of the cement beneath restorations.It contributes to the natural translucency seen at the incisal edge of teeth.

Explanation

Opaque porcelain contains opacifiers like zirconium and titanium oxides to mask underlying colors in restorations. It is not feldspathic glass itself, nor is it used to create translucency; rather, it blocks light to hide the cement shade. The translucency characteristic of natural incisal edges is produced by different porcelain layers.