What is a common contraindication for choosing metal-ceramic restoration?

Choosing metal-ceramic restorations is typically contraindicated in cases of patient allergies to metals. This is because such allergies can lead to adverse reactions when metal components come into contact with the body's tissues, causing inflammation or other health issues. Patients who exhibit known sensitivities or allergies to specific metals should ultimately be offered alternative restoration options that do not involve metal.

In contrast, tooth trauma, replacement of class II amalgam restorations, and severe tooth decay do not inherently disqualify the use of metal-ceramic restorations. These scenarios may require careful consideration of a tooth's condition and potential treatment plans, but they do not pose the same immediate risk to patient safety as allergies do. Therefore, understanding patient history concerning metal allergies is critical when planning for metal-ceramic restorations.