Which statement is incorrect regarding prefabricated crowns?

Prefabricated crowns are designed for quick and efficient use in dental practice, and while they are convenient, they often do require some level of adjustment to ensure a proper fit and occlusion. This is a common characteristic of prefabricated crowns, as they are manufactured in standard sizes and shapes but may not align perfectly with every individual's tooth anatomy.

In contrast, prefabricated crowns can indeed be available for both bridges and single units, displaying versatility in their application. They are often recognized for being less aesthetic compared to custom crowns, primarily because custom crowns can be tailored to match the color and translucency of the surrounding teeth more closely. Additionally, they come in various material types, including metal, resin, and porcelain, providing options based on the patient's needs and preferences. This variety in materials further supports their use in different clinical scenarios.