What type of tray is typically used for taking impressions of the entire dental arch?

A full arch tray is specifically designed to capture impressions of the entire dental arch, making it the appropriate choice for comprehensive dental procedures requiring a complete view of the upper or lower jaw. This type of tray is typically larger and shaped to fit the full dental arch, ensuring that it collects adequate material to accurately reproduce the contours of the gums, teeth, and overall arch.

In contrast, a quadrant tray is designed for only a section of the dental arch, making it unsuitable for obtaining full impressions. A custom tray, while beneficial in providing a personalized fit for specific therapeutic or diagnostic needs, is often created for precise areas rather than the entire arch. A partial tray, like the quadrant tray, is intended for specific limited areas and cannot capture the entire arch.

Therefore, the full arch tray is the correct answer as it is essential for obtaining an accurate and comprehensive impression of the full dental structure, making it vital for various dental treatments and procedures.