Values are representative ranges based on clinical literature. Properties vary by manufacturer, processing and cementation protocol. Always follow manufacturer instructions.
Picking the wrong material costs $200-400 in remakes
Restorative material selection is not an esthetic preference — it is a clinical decision that affects longevity, biomechanics and cementation protocol. A beautiful material in the wrong position fails. A tough material in the esthetic zone disappoints.
Flexural strength: the number that matters
Flexural strength (MPa) tells you how much force the material withstands before fracturing. Posterior = you need >800 MPa (zirconia). Anterior = you can prioritize esthetics at 300-400 MPa (e.max) if occlusion allows. The number doesn't lie.
Translucency: the line between natural and artificial
Natural teeth transmit light in complex ways. An opaque material (3Y zirconia) blocks light and looks “dead” in the anterior. A translucent material (e.max, 5Y zirconia) mimics natural light transmission. But more translucency = less strength. It's always a trade-off.
Cementation protocol changes everything
3Y zirconia can be conventionally cemented (glass ionomer). E.max REQUIRES adhesive cementation (dual-cure resin with silane + hydrofluoric acid). If you pick a material without considering your cementation protocol, the restoration either debonds or never reaches optimal adhesion.
How to pick the right material in 4 clinical steps
1
Assess position and occlusal force
Anterior prioritizes esthetics (translucency, fluorescence). Posterior prioritizes strength (flexural >800 MPa). Premolars are the transition zone where both factors weigh in. In bruxers, strength always wins — regardless of position.
2
Measure available space
Every material has a minimum thickness to function. Monolithic zirconia needs 0.5-0.8mm occlusal. E.max needs 1.0-1.5mm. PFM needs 1.5-2.0mm (metal + porcelain). If interocclusal space is under 1mm, your options narrow sharply.
3
Consider the substrate
Stump shade affects the final result in translucent materials. A metal post under e.max shows through as a gray shadow. A dark stump needs either a more opaque material or an opaque cement that compensates. When there's a metal post, opaque zirconia can be a better call than translucent e.max.
4
Define cementation protocol BEFORE choosing
If you plan conventional cementation (glass ionomer), you need mechanical retention and materials that don't rely on adhesion (3Y zirconia, PFM). If you have a full adhesive protocol (etch + silane + dual-cure resin), you can confidently use e.max and 5Y zirconia. Material and cementation are a joint decision.
5 classic mistakes in material selection
1
3Y monolithic zirconia for esthetic anteriors
3Y zirconia (tetragonal) gives ~1,200 MPa flexural strength but low translucency. In the anterior zone, especially for single units surrounded by natural teeth, it reads opaque and monochromatic. For anterior work, consider 5Y zirconia (cubic), multilayer zirconia, or e.max.
2
E.max in bruxers
E.max (lithium disilicate) has ~400 MPa flexural strength. In a bruxer generating 800-1,000 N of force, it's a fracture waiting to happen. If the patient has obvious wear facets, reported parafunction, or masseter hypertrophy, go with 3Y monolithic zirconia even on premolars.
3
Feldspathic for posterior
Feldspathic porcelain has the best esthetics (natural fluorescence, graduated translucency) but only ~120 MPa flexural strength. In the posterior zone it fractures within months. Reserve it strictly for anterior veneers where forces are controlled and the substrate is sound enamel.
4
PFM in a nickel-allergic patient
Nickel-chromium base alloys (the most affordable PFM option) contain 60-80% nickel. In patients with reported or suspected metal allergies, they trigger contact stomatitis, gingival erythema and chronic pain. Always ask about metal allergies. When in doubt, use a noble alloy or an all-ceramic option.
5
Choosing by price instead of clinical indication
3Y monolithic zirconia is the most affordable CAD/CAM milled material. But if you use it on a single anterior veneer because it costs less than e.max, the disappointing esthetic result triggers a remake that costs twice as much. The cheapest material is the one that works the first time.
Frequently asked questions about dental materials
No. “Better” depends on the indication. For a posterior crown in a bruxer, 3Y zirconia wins. For a single anterior veneer where you need to match the translucency and fluorescence of the adjacent tooth, e.max with adhesive cementation delivers an esthetic result monolithic zirconia can't match. Every material has its zone of excellence.
PFM (porcelain-fused-to-metal) is still valid for: (1) long-span bridges (>4 units) where metal strength is critical; (2) mechanical retention over short or tapered preps where adhesive cementation isn't practical; (3) tight budgets where multilayer monolithic zirconia isn't available; (4) situations where you need to solder components. With 50+ years of clinical evidence, PFM remains the best-documented material.
The number indicates the yttria (Y2O3) percentage that stabilizes the crystal structure. 3Y (3 mol%): tetragonal phase, ~1,200 MPa flexural, opaque — ideal for posterior. 4Y (4 mol%): mixed tetragonal/cubic, ~800 MPa, intermediate translucency — great for premolars. 5Y (5 mol%): cubic phase, ~600 MPa, high translucency — for esthetic anterior. Multilayer blanks combine 5Y incisal and 3Y cervical in a single disc.
Yes, but not as much as prep quality, cementation and occlusion. A systematic review by Pjetursson et al. (2007) reported 5-year survival rates of 95.6% for PFM, 93.3% for all-ceramic and 97.8% for implant-supported crowns. The gap between materials is smaller than the gap between a solid clinical protocol and a sloppy one.
Nano-ceramic resin blocks (like Lava Ultimate, Cerasmart, Shofu Block HC) offer ~230-240 MPa flexural with an elastic modulus close to natural tooth (~10-12 GPa vs ~13 GPa for dentin). Upsides: they absorb occlusal impact, they're easy to adjust and repair, and they're gentle on the opposing tooth. Downsides: lower durability than ceramic (rated as semi-permanent 5-7 years), susceptible to occlusal wear, and not bridge candidates.
Compare materials with data, not opinions
TrazaLab helps you document every clinical decision with evidence. Because the best restoration starts with the best material choice.