FAQ
What is the best crown material for posteriors?
A straight answer first, then the context behind it, from the technicians who do the work.
THE SHORT ANSWER
Monolithic zirconia is the clinical standard for most posterior crowns. It resists fracture under occlusal load, machines with high precision in a digital workflow, and eliminates the porcelain chipping that plagued PFM restorations. For cases with heavy bruxism, high-translucency zirconia in 1,000 to 1,200 MPa flexural strength range is the go-to. Full-contour lithium disilicate works for premolars with moderate load.
THE CONTEXT
What sits behind it
Material choice for posteriors comes down to three variables: occlusal load, preparation depth, and patient parafunction. Monolithic zirconia handles the highest bite forces , molars in bruxers regularly exceed 800 N , without the fracture risk of layered ceramic. A 3Y or 4Y zirconia in the 900-1,200 MPa range covers the majority of molar cases. Preparation depth matters here: zirconia needs a minimum 0.5 mm occlusal reduction; less than that and you compromise either the material or the occlusion.
Lithium disilicate (e.max) is the right call for premolars where esthetics matter and load is moderate. Its flexural strength sits around 400 MPa , enough for second premolars in non-bruxing patients, but a liability on first molars with heavy contacts. Stacking a layered ceramic on top of a zirconia coping in the posterior is a pattern that predictably leads to chip failures within 18-36 months. Most labs have moved away from it for posteriors since 2018.
At Dani Dental, each case review includes a material recommendation based on the opposing arch, prep photos, and any parafunctional flags in the Rx. That conversation happens before the case goes to the mill, not after a remake request. Turnaround on monolithic zirconia posteriors runs 5 business days standard.
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