If it is not right in the mouth, it does not get cemented. That one rule explains almost every remake of dental lab work, and it is the reason a crown, bridge or denture you expected to walk out with can quietly go back to the laboratory for another cycle. A remake is not the system failing. It is the last quality check in a long chain, and it is the only check that happens with your face attached to the work.
Lumi Dental already has an article on what happens inside the dental laboratory while your crown is being made. That piece follows the work forwards: the impression or scan, the model, the design, the milling or pressing, the layering and the glaze. This article picks up where that one stops. It covers what happens when finished lab work comes back and is not right, why it goes back, who carries the cost of a second one, and what those extra weeks are actually being spent on.
Key takeaways
- Most of the wait between your two appointments is transit and laboratory queue rather than hands-on bench time.
- A chairside adjustment takes minutes, while a genuine remake restarts the entire laboratory cycle from the impression.
- Work is usually returned for contacts, bite, shade, margins, a distorted impression or a damaged model.
- Most laboratories carry a remake policy, so a remake rarely produces a second laboratory charge for the patient.
- A temporary crown that keeps coming off is clinical information, not simply an inconvenience to put up with.
- A second impression or scan is a normal step towards a correct fit, not evidence that something went wrong.
The gap between your appointments is not idle time
Most of the wait between a preparation appointment and a fit appointment is spent moving and queueing, not cutting and layering. The chain usually runs like this: the practice packages the impression or sends the digital file, a courier or the post carries it to the laboratory, the laboratory books it into a production schedule, a technician does the bench work in stages, a supervisor checks it, and then the whole thing travels back and is checked again at the practice before you are seated.
Bench time for a single crown is often only a few hours, but those hours cannot be run back to back. Ceramics need firing cycles that take time to heat and cool. Stone models need to set. Glazes need their own cycle. Adhesive and layering steps have to be done in sequence, and a technician working on twenty cases at once is fitting your unit into a queue that already has a shape.
The postal leg is the part patients underestimate. Many Australian practices use laboratories in another suburb, another state or overseas, and a physical impression has to travel in both directions. A digital workflow removes the outbound postal leg entirely, because the file is transmitted the same day. If you want the detail on how those two front ends differ, the comparison of a digital scan against a conventional dental impression covers accuracy, comfort and turnaround properly.
A two week wait is usually four or five separate small waits stacked end to end rather than one long pause.
An adjustment is minutes, a remake is a whole new cycle
The difference between an adjustment and a remake is whether the work can be corrected in your mouth or has to be rebuilt from scratch. That distinction decides everything about your timeline, so it is worth understanding before you are sitting in the chair wondering why the appointment has changed shape.
Chairside adjustments are routine and expected. A contact that is slightly tight can be polished. A bite that reads a fraction high is marked with articulating paper, reduced and repolished. An internal surface that is binding can be relieved. A denture that is rubbing gets the sore spot marked and eased. A tiny surface stain can sometimes be added and reglazed. All of these are normal, and a crown that needs five minutes of adjusting is a crown that fits.
A remake is different in kind, not just in size. It means the shape underneath is wrong, so nothing done on the surface will fix it. The case goes back with a fresh impression or scan, a new model is poured or printed, the unit is built again, and the transit and queue clocks start again from zero. That is why a remake usually costs weeks rather than minutes, and why practitioners are careful to explain it properly rather than hurry you through it.
The honest version of the rule is this. Everything that can be corrected in the mouth without compromising the fit or the material should be corrected in the mouth. Everything that cannot goes back. Cementing a compromised unit to save an appointment is how a tooth ends up with recurrent decay under a margin three years later, which is a far more expensive problem than a fortnight of waiting.
The usual reasons dental lab work gets sent back
Almost every return falls into one of six buckets, and each has a different fix. Knowing which one you are dealing with tells you whether you are looking at an extra five minutes or an extra three weeks.
The contact is too tight or too open
A contact is the point where your new crown touches the tooth next door. Too tight and floss shreds or will not pass at all. Too open and food packs into the gap after every meal, which patients notice within days. A slightly tight contact is polished at the chair in a couple of minutes. A genuinely open contact usually cannot be closed on a finished ceramic unit, so the case goes back to have contact added and refired, or is remade.
The bite reads high
A high bite is the most common single reason a fit appointment runs long. The new surface makes contact before the rest of your teeth do, which feels like biting on a pebble and can make the tooth ache within a day. Small discrepancies are adjusted and polished on the spot. A bite that is significantly out, often because the records of how your jaws meet were taken while you were numb and guarding, may need new records and a rebuild.
The shade does not match under a different light
Shade is the most subjective failure and the one patients care most about on a front tooth. Teeth read differently under surgery lighting, daylight and warm household lighting, and a shade that looked correct at the preparation appointment can look grey or too opaque once you are standing near a window. Small corrections can be stained and reglazed. A genuine mismatch on a visible tooth is a remake, and it is worth insisting on. The guide to tooth shade matching explains why the same tooth can honestly look like two different colours in two rooms.
The margin was not fully captured
The margin is the border where the crown meets your tooth. If the impression or scan did not record that border cleanly, usually because of bleeding, saliva or gum tissue sitting over it, the technician has to guess where it sits. A guessed margin can look fine on the model and be short or over-extended in the mouth. This one is almost always a remake, because the underlying shape is wrong.
A distorted impression or an inaccurate scan
Impression material can pull, tear or set unevenly, and a tray that moves during setting produces a model that is subtly the wrong size. Digital scans can drift on long spans or where there are few landmarks to stitch to. Distortion often is not obvious until the finished unit will not seat, and the correction is a new record and a new cycle.
A fractured or damaged model
Models are stone or resin and they break, particularly on thin sections between prepared teeth. If a die snaps, the technician can sometimes repair it, but repaired stone is not reliable at the margin. A responsible laboratory will ask for a new impression rather than build on a repaired die, and that request is a good sign about the laboratory rather than a bad one.
What is fixed at the chair and what has to go back
| What is wrong | Usually fixed at the chair | Usually a remake | What it adds to your timeline |
|---|---|---|---|
| Contact slightly tight | Yes, polished in minutes | No | Nothing, same appointment |
| Contact open, food packing | Rarely | Often | A full laboratory cycle |
| Bite reads a fraction high | Yes, marked and adjusted | No | Nothing, same appointment |
| Bite significantly out | No | Yes, with new records | A full cycle plus a records visit |
| Minor shade or surface texture | Sometimes, stain and reglaze | Sometimes | A few days if only reglazed |
| Clear shade mismatch on a front tooth | No | Yes | A full cycle, often with a shade visit |
| Margin short or over-extended | No | Yes | A full cycle from a new record |
| Distorted impression or scan | No | Yes | A full cycle from a new record |
| Denture sore spot | Yes, eased and reviewed | No | A short review appointment |
| Denture loose from tissue change | Sometimes, by reline | Sometimes | Days for a reline, weeks for new |
The table is a guide rather than a rule book, because two patients with the same finding can end up on different paths.
Who carries the cost when work is remade
In most cases a remake does not generate a second laboratory charge for the patient. Dental laboratories in Australia generally operate a remake policy, which is a commercial warranty on their own workmanship for a defined period. If the fault sits with the laboratory, the laboratory rebuilds the unit and absorbs the materials and bench time. If the fault sits with the record that was sent, many practices absorb the second laboratory fee themselves rather than pass it on, because the record was theirs to take.
There are situations where a further fee is reasonable and should be discussed openly before anything is restarted. A change of plan partway through, a request for a different shade or shape after the case was already built to an agreed prescription, damage to a finished appliance, or a substantial delay that means the mouth has changed since the record was taken, are all examples where the second unit is a genuinely new piece of work rather than a correction.
The practical protection is the same one that applies to any dental treatment. Ask for the plan in writing before you start, and ask specifically what happens if the work has to be remade. The Australian Dental Association and the Australian Competition and Consumer Commission both push the same principle from different directions: consumers are entitled to know the terms before they commit, and health services are expected to obtain informed financial consent rather than surprise people afterwards. A practice that answers that question plainly is telling you something useful about how it operates.
What you wear while the work is being remade
You are not left with a bare prepared tooth. For crowns, onlays and bridges, a temporary is made at the preparation appointment and stays on until the definitive unit is ready. Temporaries are deliberately built to come off, because they are held with a soft cement designed to release cleanly, and they are not made from the same materials as the final restoration.
A temporary that fails once is bad luck. A temporary that keeps failing is clinical information. It usually means the prepared tooth is short, the margin sits deep under the gum, the bite is heavy on that tooth, or there is a grinding habit loading it every night. Each of those findings changes what should be done for the definitive unit, so it is worth reporting rather than tolerating. If yours comes off between appointments, the guidance on what to do when a temporary crown comes off explains the immediate steps and why you should not leave it uncovered for long.
For dentures, the interim arrangement depends on what you already have. Some patients wear their existing denture while a new one is built. Others have an immediate or interim denture placed and adjusted repeatedly while the tissues settle. Where the underlying ridge has changed shape, a reline can restore the fit of an existing denture far faster than a new build, which is why the comparison of denture relines against new dentures is worth reading before assuming a remake is the only route.
A second impression is not a sign that something went wrong
Being asked for a second impression or scan is a normal part of getting the fit right. A second record is taken when the first one has a visible defect, and spotting that defect is the skill. The alternative, sending an imperfect record and hoping the technician can work around it, is how a case ends up being remade twice instead of made once.
Bleeding gums, a stubborn saliva flow, a patient who gags, a tooth prepared close to the gum line and a long span with several units are all reasons a first attempt may not be good enough. In my experience the cases that go smoothly are the ones where someone was willing to stop and repeat a step early.
If you are told a second record is needed, the useful questions are what specifically was wrong with the first one, whether anything about your mouth made it harder, and whether the same problem is likely at the fit appointment. A good answer tells you what to expect next. It also often explains why the treatment was planned the way it was in the first place, which the overview of what to expect when you are getting a dental crown sets out step by step.
Realistic turnaround for crowns, dentures and appliances
Different kinds of laboratory work have genuinely different timelines, and comparing them to each other causes a lot of unnecessary worry. A crown is one unit built to one prescription. A denture is a sequence of appointments where each stage depends on the last, so it cannot be compressed the same way.
Single crowns, inlays and onlays typically take a couple of weeks in a conventional workflow. Some practices mill certain restorations in house on the day, which changes the arithmetic entirely, though not every material and not every case suits that route. Bridges usually take longer than a single crown because there are more units to match and more chances for a fit problem to appear.
Full dentures usually run across several appointments over some weeks: primary impressions, secondary impressions, a bite registration, a try-in where you see the teeth in wax, and then the finished processing. The try-in exists precisely so that shade, shape and tooth position can be changed while changing them is still cheap and quick. Skipping or rushing that stage is the most common cause of a finished denture the patient does not like.
Appliances such as night guards, retainers and sports mouthguards are usually the quickest, because there is no shade to match and the fit tolerance is more forgiving. Implant restorations sit at the other end, because components have to be ordered, verified and sometimes tried in before the final unit is built.
Questions worth asking at the fit appointment
The fit appointment is the point where you have the most influence and the least information, so a short list helps. Ask these before anything is cemented, not after.
- Does the margin feel clean and closed all the way around, and can I see it on a radiograph if there is any doubt?
- Does floss pass through the contacts and come back out without shredding?
- Does my bite feel even on both sides when I tap together, and again when I slide side to side?
- Can I look at the shade near a window or in natural light before it is cemented rather than afterwards?
- If something is not right, what is the plan and what is the timeline, and will there be any further cost?
- What should I expect over the next week, and at what point should I ring rather than wait for the review?
Say something if the bite feels odd. Patients assume they will get used to it, but a genuinely high restoration can produce a sore tooth, a sore joint and a fractured porcelain surface within months. Two minutes of adjusting on the day prevents all of that.
Frequently asked questions
Is a dental crown remake a sign that my dentist made a mistake?
Usually not. Remakes happen for reasons spread across the whole chain, including impression distortion, laboratory processing, model damage and the way the mouth itself behaves on the day. What matters is that the problem was caught before cementation rather than after, because a compromised unit that is cemented is far harder and more expensive to deal with later.
How long does a dental laboratory remake take in Australia?
A remake generally takes about as long as the original, which for a single crown is commonly a couple of weeks and for a denture can be several weeks across multiple appointments. If a new impression or new bite records are needed first, add the time to get you back into the chair for that record.
Will I be charged twice if my crown has to be remade?
In most cases no. Laboratories generally operate a remake policy that covers their own workmanship, and many practices absorb the second laboratory fee where the record was the issue. Ask before treatment starts what the arrangement is, and get the answer in writing along with the rest of the treatment plan.
Can a crown be adjusted instead of remade if the shade is slightly off?
Sometimes. Small colour and texture corrections can be added as surface stain and refired, which takes days rather than weeks. A shade that is clearly wrong on a front tooth is usually a remake, because surface staining cannot correct the underlying brightness or translucency of the ceramic.
What should I do if my temporary crown keeps coming off?
Ring the practice rather than waiting for the scheduled fit appointment. Repeated failure usually means something about the preparation, the bite or a grinding habit needs to be addressed, and that information changes how the definitive restoration should be designed. Leaving the tooth uncovered can also allow it to move or become sensitive.
Does a digital scan reduce the chance of a remake?
It removes some failure modes, particularly impression material distortion, tray movement and damage in transit, and it removes the outbound postal leg. It does not remove all of them, because a scan still cannot record a margin that is hidden by gum tissue or blood. Good soft tissue management matters either way.
If you are new to Lumi Dental and want a clear picture of a tooth before any laboratory work is planned, the current new patient offer is the simplest way to start, and the details sit on the current offers page. The team at Lumi Dental is open Monday to Saturday, and a written treatment plan with the remake terms spelled out is part of how any crown or denture case should begin.
This article is general information only and is not a substitute for an examination and personal advice from a registered dental practitioner.
