Full-arch implant bridges: zirconia, titanium bar or PMMA?

What are the material options for a full-arch implant bridge?

Three structures, combined four ways on the Rx. A one-piece monolithic zirconia bridge is milled from a single disc and screwed down on titanium cylinders. Zirconia on a milled titanium bar puts a zirconia superstructure over a metal bar that connects to the implants. PMMA, an acrylic resin milled from a puck, shows up as the immediate-load provisional, as a prototype before zirconia and, in some treatment plans, as a longer-term prosthesis, on its own or over a bar.

The choice is clinical: restorative space, opposing dentition, parafunction and treatment phase all weigh in. Below is what the literature shows for each option and what each one needs on the prescription.

How long do full-arch zirconia bridges last?

Short- and mid-term numbers are good. A systematic review by Bidra and colleagues (European Journal of Oral Implantology, 2017) pooled 285 zirconia full-arch prostheses in 223 patients and found a 1.4% failure rate, from four fractured prostheses. Prosthetic complications occurred in 16.1%, almost all of them (14.7%) veneer fractures. The authors pointed to monolithic zirconia, stained only or veneered just at the gingiva, as the promising route.

A 2026 umbrella review in the Journal of Prosthetic Dentistry, covering seven systematic reviews with 5 to 15 years of follow-up, confirms the pattern. Full-arch prosthesis survival ranged from 89.5% to 96.8%. Veneered zirconia chipped at 15–35%, framework fractures stayed below 5% and screw loosening ran at 5–15%. Monolithic zirconia and screw-retained designs had fewer technical complications.

How much restorative space does zirconia need?

Around 11–14 mm from the soft tissue to the opposing occlusal surface, according to an ITI Blog article by Said Sánchez (2022) on one-piece monolithic zirconia. The same article recommends 3Y zirconia, the strongest type, with veneering porcelain kept to non-functional areas.

Space is not a detail. A 2026 study in the Journal of Prosthodontics looked at 3,300 monolithic 3Y zirconia full-arch bridges from one commercial lab and found 91.67% five-year survival. Framework fracture was the leading failure (38 cases), concentrated in prostheses with insufficient vertical space. There were no titanium cylinder debonds or fractures.

Is zirconia on a titanium bar worth it?

Against a metal-acrylic hybrid, the evidence favors zirconia on a bar. A 2026 meta-analysis in the Journal of Clinical and Experimental Dentistry compared screw-retained zirconia-on-metal full-arch prostheses with metal-acrylic ones across 12 studies. Zirconia on metal showed less prosthetic wear (RR 0.29) and less peri-implantitis (RR 0.67), and marginal bone loss also favored it. Implant survival, framework fractures, esthetics and speech did not differ.

The authors flag moderate to critical risk of bias in most studies. And the comparison is with metal-acrylic, not with monolithic zirconia: we found no clinical study comparing one-piece zirconia head to head with zirconia on a bar. Between those two, the call is part of your treatment plan.

Where does PMMA fit?

Mostly in the provisional phase. In a 2026 randomized crossover trial in the Journal of Prosthodontics, 20 edentulous patients wore a milled PMMA provisional and a 3D-printed hybrid-resin provisional for three months each. PMMA had mechanical complications in 10% of cases against 45% for the printed resin; passive fit and color stability were similar.

PMMA also works as the prototype before zirconia. The ITI Blog article recommends wearing a milled prototype for 6–8 weeks to test occlusion and esthetics before milling the definitive bridge. As a longer-term prosthesis, PMMA on a bar is closest to the metal-acrylic category in the literature, which wore more than zirconia on metal in the 2026 meta-analysis.

What to put on the lab Rx

Each material needs different information, and the Rx has to state the plan. For any full-arch case, include implant brand, system and platform plus the restorative components, and send the scan with scan bodies or an impression with impression copings, the opposing arch and a bite registration.

For zirconia, give the measured interocclusal space and the opposing material; if a PMMA prototype was approved in the mouth, it becomes the design reference. For zirconia on a bar, confirm you want the milled bar and whether the superstructure should follow the prototype. For an immediate-load PMMA provisional, send the surgical guide used on guided cases and agree on the turnaround when the case is opened.

At case check-in we confirm the implant components are in stock and that design approval is on file when the case requires it. See how we make a full-arch zirconia bridge, zirconia on a titanium bar, a PMMA full-arch bridge and an immediate-load prosthesis, and use the guide to sending a case for the file checklist.