FAQ
Can zirconia crowns chip?
A straight answer first, then the context behind it, from the technicians who do the work.
THE SHORT ANSWER
Yes, zirconia crowns can chip, though the failure mode differs by material type. Monolithic zirconia rarely fractures but can exhibit minor surface wear or edge chipping under extreme occlusal load. Layered zirconia, which adds a feldspathic or glass-ceramic veneer for esthetics, chips at the porcelain layer in roughly 5-10% of cases over five years if occlusion is not properly managed.
THE CONTEXT
What sits behind it
Chipping risk splits cleanly along two zirconia categories. Monolithic zirconia, milled from a single high-strength block, has flexural strength between 900 and 1,200 MPa depending on grade. That makes outright fracture rare. The more common issue is wear on the opposing dentition, particularly with older first-generation high-opacity zirconia. Modern ultra-translucent monolithic formulations are engineered to reduce abrasion while maintaining structural integrity.
Layered zirconia presents a different problem. The substructure is strong, but the overlying porcelain veneer is feldspathic glass and behaves like any glass-ceramic under tensile stress. Chipping rates documented in the literature cluster around 5-10% at five years for posterior layered restorations. Proper occlusal adjustment at seating, a verified centric stop, and night-guard guidance for bruxers cut that number significantly. A lab that checks occlusal contacts before shipping, not after the seat appointment, catches most of this earlier.
For general dentists managing a patient with documented parafunction, the safest choice for posterior units is monolithic zirconia. Anterior cases requiring higher translucency benefit from a layered design paired with clear instructions for the patient about nighttime habits. That conversation starts at case planning, not at the two-week follow-up call.
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