A patient with epilepsy needs a posterior crown on tooth #19 and dislikes the metal collar visible on his existing restoration. Which material is the BEST choice?

Correct answer: B. Monolithic zirconia

• A. A gold crown is durable and biocompatible but is metal-coloured — it does not address the esthetic complaint.
• B. CORRECT. MONOLITHIC ZIRCONIA addresses both concerns. Esthetically it eliminates the metal collar and the grey shadow at the margin. Functionally it has the highest flexural strength of the tooth-coloured materials (roughly 900–1200 MPa) and, being a single monolithic unit with no veneering porcelain, it cannot chip or delaminate. In a patient with epilepsy — where a seizure may generate uncontrolled clenching and forceful trauma — fracture resistance is a genuine clinical priority, as is avoiding any restoration likely to fragment and be aspirated.
• C. Feldspathic porcelain is the weakest ceramic option and entirely inappropriate for a posterior tooth under high load.
• D. PFM is exactly what the patient objects to — the metal collar and possible marginal grey are the presenting complaint.

Note: Zirconia's main trade-offs: it is opaque relative to lithium disilicate, it is abrasive against opposing enamel if not properly polished, and it is difficult to remove.