Emax or zirconia crowns

E.max is the lithium disilicate option in this comparison. Clinical outcomes for single full-coverage lithium disilicate restorations include biological, periodontal, pulpal, and recurrent-caries outcomes, so the crown must be assessed as a restoration rather than as a material label alone.

Zirconia and lithium disilicate are distinct ceramic choices. The restoration needs to suit the tooth location, the forces on the tooth, the available tooth structure, and the required precision at the crown margin.

A crown is a full-coverage restoration, so its clinical work includes preparing the tooth and fitting the restoration. The material is only one part of the comparison; the extent of tooth preparation and the work needed to achieve an accurate fit also matter.

Marginal fit is among the main predictors of long-term biological success and longevity for a full-coverage crown. A poor margin can increase microleakage, bacterial biofilm formation, demineralisation, and periodontal inflammation.

Post-operative sensitivity and pulpal injury can occur after tooth preparation and cementation. Recurrent caries is identified as the most common late cause of failure in reviewed full-coverage lithium disilicate restorations.

Some teeth can be rebuilt with a white filling material that bonds to enamel. A porcelain veneer can also be an alternative for a front tooth when the bite is not heavy, so a full crown is not always the only restoration.

Assess whether the tooth needs full coverage, the bite at that position, how much tooth structure remains, and whether a well-fitting margin can be achieved. A bonded white filling or a porcelain veneer may change the decision for a suitable tooth.