How strong is zirconia?

Properly polished monolithic zirconia wears opposing enamel at rates comparable to natural enamel-on-enamel contact, per a 2016 Journal of Prosthetic Dentistry study. The problem is unpolished or roughly-adjusted zirconia, which acts as an abrasive against opposing dentition. Any chairside occlusal adjustment must be followed by repolishing with a zirconia-specific polishing kit. Dani Dental ships every monolithic zirconia unit pre-polished to a glaze-equivalent finish on the occlusal surface, and we include a polishing protocol card in the case package for any chairside adjustments.

Yes, but the generation matters. First-generation 3Y-TZP is too opaque for anterior esthetics in most cases. Fourth-generation 5Y-TZP delivers translucency that approaches lithium disilicate while retaining roughly 600 to 700 MPa flexural strength. For high-demand anterior cases (centrals, lateral incisors with thin facial walls, or patients who reject any opacity), layered zirconia with a feldspathic facial veneer over a zirconia core delivers the esthetics. Submit a shade photo with the Rx and the ceramist on the case will recommend the right approach.

Clinical studies tracking monolithic zirconia crowns past the 10-year mark report survival rates above 95% with no catastrophic fractures in the cohort (Sailer et al., Clinical Oral Investigations, 2018). The dominant failure modes are not fracture; they are biological (recurrent caries at the margin, periodontal loss) or cementation-related debonding. Material longevity past 15 years has not been fully characterized because zirconia restorations have not been in widespread clinical use long enough, but the in-vitro fatigue data projects 20-plus year service life under normal occlusal load.