Which Statement Is True About Impression Trays

Multiple Choice

Which statement is true about impression trays?

A) The triple tray is a custom full-arch tray used for bite registration.
B) Stock trays are made of plastic rather than metal and can be solid or perforated.
C) Plastic trays are inexpensive and disposable,whereas metal trays are more expensive and must be cleaned and sterilized between uses.
D) Custom trays are constructed in the patient's mouth with chemically cured,light-cured,or thermoplastic resins on casts of the teeth.