What occurs when porcelain is overglazed?

When porcelain is overglazed, the surface of the material is coated with an additional layer of glaze that can create a particular aesthetic effect. This process aims to enhance the appearance and durability of the porcelain. However, if done improperly, overglazing can lead to a cloudy or hazy appearance rather than maintaining the desired clarity and shine. This cloudiness results from issues such as improper application of the glaze, incorrect firing temperatures, or the use of incompatible materials.

The clarity and sheen of the porcelain are essential for its visual appeal, especially in dental applications, where aesthetic quality is paramount. A cloudy appearance can compromise the overall look of dental restorations, making them less natural-looking and potentially affecting patient satisfaction.

In summary, the process of overglazing porcelain, if executed properly, should enhance its properties, but when mishandled, it can lead to undesirable characteristics such as cloudiness. This is why the correct answer pertains to the appearance of the porcelain after overglazing.