A premolar has fractured its lingual cusp. To plan treatment, what is most important to assess?

Correct answer: A. Restorability (extent of remaining tooth structure / margins)

• A. Correct. The first decision is whether the tooth is restorable — how much sound structure remains and whether a ferrule/margin can be obtained.
• B. Shade matters only after deciding the tooth can be restored.
• C. Adjacent mobility is unrelated to restoring this fractured cusp.
• D. Opposing occlusion is considered later in restorative design, not the primary assessment.

Note: Pulp vitality and percussion are also assessed; restorability is the key determinant of whether/how to restore.