You seal the package, drop it at the post office, and then nothing happens for a couple of weeks until an appliance arrives at your door. That gap is where most people ordering from a mail in a dental lab start wondering what is actually going on. The answer is a sequence of steps that has existed for decades, because labs have always made these appliances. What changed is that your impression now arrives by post rather than from a dentist down the road. Here is what happens to it once it lands on a technician’s bench.
What Happens to Your Dental Impression When It Arrives
Intake & Case Matching
Your package is opened and logged against the order you placed. The impression itself carries no identifying marks, so the paperwork included in the box is what ties it to your name, your product selection, and any notes you supplied about shade or tooth position.
Missing paperwork holds up more cases than damaged impressions do. That is worth knowing when you pack the return mailer.
The Inspection That Decides Everything
Before any work begins, a technician examines the impression under good light. They are checking for detail on every tooth surface, a clear gum line running around each tooth, and full coverage of the arch with no bare patches where the tray shows through.
They are also checking for movement. An impression taken while the tray shifted has smeared detail running in one direction, and no amount of careful work downstream recovers from that.
If it fails inspection, the lab contacts you and sends fresh material. This feels like a setback and it is the correct outcome. A technician who builds an appliance from a poor impression has produced something that will not fit, and you both find that out three weeks later instead of three days later.
Turning Rubber Into Stone
Pouring the Model
An impression is a negative. Every tooth appears as a hollow, and the gum ridge appears as a valley. To work on it, a technician needs the positive.
Dental stone is mixed to a controlled consistency and vibrated into the impression so it flows into every hollow without trapping air. Vibration matters here, because a bubble sitting at the tip of a tooth becomes a defect in the model and then a defect in the appliance.
The stone sets over the next hour or so. Once hard, the impression is separated from it, and what remains is a replica of your arch accurate enough to build on.
Mounting & Bite Relation
If your order included a bite record, the upper and lower models are positioned against each other to reproduce how your teeth actually meet. That relationship determines the height of any replacement teeth and how the appliance behaves when you chew.
Getting this wrong produces an appliance that feels high, causes sore spots, or leaves your natural teeth doing all the work.
Designing the Appliance
Surveying the Model
A technician mounts your model on a surveyor and identifies the widest point of each tooth that will carry a clasp or a resin arm. Retention comes from gripping just below that point, so those contours are marked directly onto the stone.
This step also reveals problems. A tooth with almost no undercut gives a clasp nothing to hold. A tooth tipped at an odd angle changes where the arm has to sit. These are the kinds of things that get spotted here rather than after fabrication.
Drawing the Framework
The outline of the appliance is drawn on the model. That includes where the base will extend across the ridge, where it stops, where the retention arms run, and where the replacement teeth will sit.
Base extension is a judgment call. Extending further spreads chewing pressure across more tissue, which is better for comfort. Extending too far crowds the tongue and the cheeks.
Building It
Setting the Teeth
Replacement teeth are selected to match the shade and size of your existing teeth, then positioned by hand against the model. Each one is angled to meet the opposing arch correctly and to look right alongside your natural teeth.
This is slow work and it is where a rushed case shows most obviously. Teeth set at the wrong angle look wrong even when the fit is fine.
Forming the Base
The method depends on material. Flexible nylon is heated until it flows and injected into a mold under pressure, then cooled. Acrylic is packed into a mold and cured. Cast metal frameworks involve producing a wax pattern, investing it, burning out the wax, and casting alloy into the space left behind.
Each of these takes hours rather than minutes, and each has a curing or cooling stage that cannot be shortened without affecting the finished piece.
Finishing by Hand
The piece comes out of the mold with excess material around its borders. A technician trims those borders back to the outline drawn earlier, smooths every edge, and polishes the surface.
Polishing is not cosmetic. A rough surface is porous, and a porous appliance holds stains and bacteria while feeling unpleasant against your tongue. This stage takes longer than most people would guess.
Checking It Before It Ships
The finished appliance goes back onto your stone model. A technician presses on one side and then the other to confirm it does not rock, checks that the retention arms engage where they were designed to, and confirms the replacement teeth meet the opposing model correctly.
Anything that fails at this point goes back for adjustment rather than into a shipping box.
Why It Takes the Time It Takes
Adding up the stages explains the calendar. Stone needs an hour to set. Curing and cooling take their own time. Setting teeth by hand takes hours, and finishing takes several more.
Between those steps, your case sits in a queue with other cases, since labs batch work by material and process rather than running one appliance at a time.
None of this is padding. A lab quoting a very short turnaround is either running a much simpler product or skipping something, and the stages most easily skipped are inspection and finishing, which are the two that determine how the appliance feels in your mouth.
What This Means for Your Impression
Everything downstream rests on the fifteen minutes you spent with a tray in your mouth. A technician can compensate for a lot, and cannot compensate for missing detail that was never captured.
That is the argument for taking your time on it, using the second set of putty if the first attempt looked doubtful, and sending it back promptly once you have one you are satisfied with.