Dental bridges are made from four main categories of materials: gold alloys, base metal alloys, porcelain ceramics, and combinations of metal and ceramic. The right choice depends on where the bridge sits in your mouth, how much you want it to blend in with surrounding teeth, and your budget. Each material handles the forces of chewing differently and ages in its own way over years of daily use.
Metal Alloys: Precious and Base
Metal bridges fall into three tiers based on their composition. High noble (precious) alloys contain at least 60% noble metals like gold, platinum, and palladium, with gold making up at least 40% of the total. Noble (semi-precious) alloys contain at least 25% precious metal. Base metal alloys use little to no precious metal and rely instead on combinations like nickel-chromium or cobalt-chromium.
Gold-based alloys have been used in dentistry for over a century because they wear at a rate similar to natural tooth enamel, meaning they won’t grind down the teeth they bite against. They’re also highly resistant to corrosion and fracture. The trade-off is obvious: they look like metal. That makes them most practical for back molars where appearance matters less and chewing forces are greatest.
Base metal alloys are significantly cheaper but come with some caveats. Nickel-based alloys, despite being widely used, have raised ongoing concerns about allergic reactions. The dental profession has historically underestimated this risk because nickel allergies don’t always show up as visible sores inside the mouth. They can instead cause skin reactions or more subtle systemic responses. Cobalt-chromium alloys carry lower sensitivity risks, though reactions are still possible. If you know you’re sensitive to costume jewelry or nickel-containing metals, mention this to your dentist before choosing a bridge material.
Porcelain Fused to Metal (PFM)
PFM bridges combine the strength of a metal framework with a porcelain outer layer that mimics the color of natural teeth. The metal substructure (which can be precious, semi-precious, or base metal) provides the bridge’s core strength, while the porcelain coating covers the visible surfaces so the bridge doesn’t look metallic when you smile.
For decades, PFM was the default choice for most bridges because it offered a reasonable balance of durability and appearance. The main weakness is the porcelain layer itself. Over time, the ceramic coating can chip or crack away from the metal underneath, especially in areas that take heavy biting force. When chipping happens, it exposes the dark metal below, creating an obvious cosmetic problem. PFM bridges can also develop a grayish line along the gum margin as gums recede with age, revealing the metal edge beneath the porcelain.
All-Ceramic Options
All-ceramic bridges contain no metal at all. They’re made entirely from materials like lithium disilicate or zirconia, which gives them a significant advantage in how they handle light. Natural teeth aren’t opaque. Light passes through enamel and scatters inside the tooth, giving it depth and warmth. Ceramic materials can replicate this translucency in ways that metal-backed bridges cannot.
Lithium Disilicate
Lithium disilicate is one of the most popular ceramics for bridges in the visible “smile zone.” Its translucency closely mimics human enamel and dentin. Lab testing shows that different translucency grades of lithium disilicate range from enamel-like light transmission to opacity levels closer to the dentin layer underneath enamel. This means a dental lab can layer different opacities to recreate the way a real tooth looks, with a more translucent edge and a more opaque core. The result is a bridge that’s very difficult to distinguish from natural teeth, even at close range.
The limitation is strength. Lithium disilicate is strong enough for single crowns and short bridges in the front of the mouth, but it may not hold up to the heavy grinding forces on back molars, particularly for longer-span bridges replacing multiple teeth.
Zirconia
Zirconia has become the dominant material in modern bridge work, and the numbers explain why. A specific form called yttria-stabilized tetragonal zirconia (Y-TZP) delivers flexural strength between 900 and 1,200 megapascals. For context, that’s several times stronger than most other dental ceramics and strong enough to handle the full force of back-tooth chewing without a metal substructure.
Zirconia bridges come in two designs. Layered zirconia uses a zirconia framework with a porcelain veneer on top for better aesthetics. Monolithic zirconia is milled from a single solid block with no porcelain overlay. The layered approach looks more natural but shares the chipping problem seen with PFM bridges. Research has shown that monolithic and specially graded zirconia resists chipping more than four times better than porcelain-veneered zirconia. In layered designs, chips tend to stay within the porcelain coating, but at higher forces the cracks can spread down to the zirconia interface and cause pieces to flake off entirely.
Newer generations of monolithic zirconia have become increasingly translucent, narrowing the aesthetic gap with lithium disilicate. They still don’t match the lifelike appearance of lithium disilicate in the front teeth, but for premolars and molars, the difference is minimal and the strength advantage is substantial.
How Long Each Material Lasts
All-ceramic bridges show an estimated 10-year survival rate around 80% to 82%, meaning roughly four out of five are still functioning a decade after placement. That number holds fairly steady whether measured at shorter or longer follow-up periods. Metal and PFM bridges have historically performed in a similar range, though individual results vary widely depending on oral hygiene, grinding habits, and how well the bridge was designed and fitted in the first place.
The most common reasons bridges fail aren’t usually the material cracking in half. Decay in the supporting teeth, gum disease undermining the foundation, and cement failure (the bridge coming loose) account for a large share of bridge replacements. This means the material you choose matters, but so does everything around it: how well you clean under and around the bridge, whether you wear a night guard if you grind your teeth, and how healthy the anchor teeth were to begin with.
Newer Manufacturing Methods
Most modern bridges are designed digitally and milled by computer from solid blocks of zirconia or lithium disilicate. This process, called CAD/CAM (computer-aided design and manufacturing), produces a more precise fit than traditional hand-casting methods and reduces turnaround time. Some offices can design and mill a bridge in a single visit, though multi-appointment workflows are still more common for bridges than for single crowns.
3D printing is also entering the picture, primarily for temporary bridges but increasingly for longer-term restorations. Permanent-grade 3D printed materials use a resin base filled with ceramic glass particles, with the inorganic filler making up 30% to 50% of the material by weight. In lab testing, these printed restorations withstand around 360 to 365 newtons of force before fracturing. That’s adequate for many situations but still below the strength ceiling of milled zirconia, so 3D printed bridges currently see more use as provisionals or in lower-stress locations.
Choosing the Right Material
Your dentist will recommend a material based primarily on location. Front teeth benefit most from lithium disilicate or high-translucency zirconia because appearance is the priority and biting forces are lower. Back teeth need the strength of monolithic zirconia or a metal-based option. Bridges spanning three or more teeth generally require zirconia or metal frameworks because longer spans concentrate more force on the connectors between teeth.
Cost is the other major factor. Base metal alloys and PFM bridges tend to be the least expensive. Zirconia and lithium disilicate cost more but eliminate metal-related concerns like allergies and the gray gum line. Gold alloy bridges are often the most expensive due to material costs, though their longevity can offset the upfront price over time. Insurance coverage varies, but most plans that cover bridges will cover the material your dentist considers clinically appropriate for the location, even if they won’t cover an upgrade chosen purely for cosmetics.