21D, a UK full-mouth rehabilitation lab, runs four Stratasys J5 DentaJet® printers to produce surgical guides accurate to under 100 microns, finer than a human hair. That accuracy lets founder Rajesh Vijay place four implants at a time to the tolerances full-mouth implantology demands, and the DentaJet build plate lets his team print up to 40 surgical guides in eight hours on a single print tray. This is how they got there.
21D exists for patients who are terminally dentate with irrecoverable stage three or stage four periodontal disease, those who have already lost more than half of their natural dentition, and full denture wearers. For these groups, treatment that misses the target means starting the clinical journey all over again, so the margin for error is close to zero.
Rajesh Vijay founded the lab after more than 30 years as a dentist, 27 of them focused on full-mouth implant workflows. His approach starts from a simple position: if a tool cannot hit the tolerance the treatment plan calls for, the plan fails at the point of execution. As he puts it, "It's all well and good having an idea and a plan, but if you haven't got the right tools that are going to deliver that plan, you're going to have a great plan, and you're going to have terrible execution, and then you're going to stop.”
According to Vijay, full-mouth rehabilitation is an engineering problem before it is a manufacturing one. Every case has to account for safe biology, optimal implant position, load mechanics and long-term function, and every patient is different. You cannot make everyone fit the same shoe size, so each case must be calculated on its own terms.
Vijay treats teeth the way an engineer treats any load-bearing replacement part. He runs the numbers on how a device will perform over years of chewing, where its fatigue points sit, and how it holds up over time. That mindset rules out guesswork, "because that's how they do it in engineering," he says, drawing the line between "yeah, that looks about right" and quality assurance that is auditable rather than an opinion. Nothing in his world is fix and forget. It is fix and maintain, and that means investing in precision early so the device stays put and functional for the long term.
Vijay chose the J5 DentaJet®because its accuracy could be proven, not just claimed. When he assessed printers, he found plenty of marketing pointing at a single axis. "There's a lot of marketing with printers, oh yeah, we're accurate to five microns…but there are three axes. You've only mentioned one." In full-mouth work all three axes matter, and the moment a supplier got vague about the data, he moved on. Stratasys gave him the data.
That decision traces back to a chance encounter. Vijay had travelled abroad to look at buying an implant company and spotted a J5 DentaJet sitting in the corner of the room. The printer, not the acquisition, became the story of the trip. He ordered one the moment he got home. Four J5 machines later, the reason he keeps buying comes down to one thing. "I can't knock the quality of the products, I just can't knock it. It is ultra consistent."
This is the heart of the case for implantology. 21D's asymmetric anatomical guides are, in Vijay's words, "ultra, ultra, ultra customized." They let him deliver four implants with discrepancies of less than 100 microns, less than the width of a human hair. He had been imagining that level of control since 1999. Now he has it.
That precision is what lets 21D do something Vijay believes no one else can do at present, which is deliver a pre-made titanium bar to the implants at the time of surgery. The guide technology is accurate enough to make that possible. When sceptics flew in from the United States to check whether the claim held up, they came back from the surgical unit inside an hour and accepted it. In implantology, that accuracy is the difference between a device that seats first time and a repeat surgery.
The accuracy holds because it is built into every step, not retrofitted in at the end. The full-mouth implant workflow runs like this:
1. Digitize the patient and plan the optimal implant positions against safe biology and load mechanics.
2. Design with two sets of eyes. Clinical designs are done with AI and human work side by side, so there are two checks on everything.
3. Manufacture. Surgical guides are 3D printed on the DentaJet, prosthetics are milled.
4. QA by overlay. Every device is scanned and overlaid against its original design. The team knows exactly how much loss manufacturing introduces, and if a device falls outside tolerance, it is remade. Nothing leaves bioengineering until it clears internal QA.
5. One box to the surgical team. The surgical guide, prosthetics, implant and instructions ship together. Vijay compares it to IKEA for the surgeon: a start position, an end position, and a manual that gets you from one to the other. For the patient it is one surgical treatment.
The result downstream is a two-hour surgery that corrects both jaws, roughly one hour per jaw, which Vijay calls hyper-efficient.
Almost everything on 21D's bench comes off the J5, apart from the metal. That includes asymmetric anatomical surgical guides, stackable surgical guides and case models, and printed veneers used for try-ins, temporization and dentures.
The large build plate is what turns single parts into production. "You can print 40 of these [surgical guides] in eight hours," Vijay says, which he rates as amazing. The color range available on the J5 matters too. Cartridges that offer 640,000 color combinations give a level of customization he had never seen before, all inside the clinical parameters the case allows.
Running four machines at an industrial level put 21D ahead of how most labs use the technology, to the point that Stratasys came to see it for themselves. What keeps it working day to day is how little the machines get in the way. Vijay compares the experience to an inkjet printer. Switch the cartridges in and out, press the button, stand back.
His bioengineers value the practical side as much as the accuracy. The machines are quiet, there is no noisy compressor, and the setup is genuinely plug and play. Load the resin cartridges, send the design, press start, watch it happen. His advice to anyone weighing it up is blunt. "If you want an easy life with a printer, get a Stratasys, and the accuracy is guaranteed.”
When printing moves from an occasional lab tool to core production, service becomes part of the equation. 21D is supported in the UK by SYS Systems, who installed the machines and manages them, and who Vijay rates as great at keeping the fleet running. For a lab producing at this volume, local installation and application support are what keep four machines in constant use.
Vijay's conversations with Stratasys are already pointing past today's workflow. His interest is resilience over rigidity. Implants sit in titanium with no flexibility and bone loses elasticity with age, so the shock absorber has to live in the teeth. Print with the wrong rigidity and a patient with no nerve feedback can bite hard enough to damage the implant, which means more surgery. His approach is to keep the same polymer and play with the filler ratios, testing where the material absorbs shock without losing performance.
The longer vision is mass customization. Vijay pictures patients designing their own smiles from an app at home and having them made exactly as designed, then fitted at any dentist. He has waited 27 years to deliver a titanium bar at the time of surgery. He does not intend to wait that long again. None of it happens without the accuracy and efficiency that the J5 delivers, and those strengths pay off because they sit inside a workflow built to the same standard. As Vijay puts it, "It's the ecosystem, it's not one piece of tech."
What 21D has proven is that precision and scale can live together in the same workflow. When the accuracy is engineered in from the first design and holds all the way through production and QA, complex full-mouth implant work can be delivered at a volume that used to be out of reach. That is what the DentaJet makes possible for 21D, and it is where Vijay believes the rest of the field is heading.
