A technician at your laboratory is sitting in front of a case for the second time today. The prescription says "crown, tooth 30, shade A2." The bite record is unclear, the margin is readable in one spot and ambiguous in another, and the box next to "occlusal staining" has nothing in it. The technician has three choices: guess, stop and call, or make it and let the office find out. Every one of those choices costs somebody money, and the office that sent it has no idea any of this is happening.
Labs are the most consequential vendor a restorative practice has and the one most practices manage the least. They are chosen by word of mouth, evaluated on price and turnaround, and fired after a bad month. This lesson is about doing it properly: what a lab genuinely needs from you, what the prescription is and why it counts as a record rather than a note, how to communicate shade so it arrives right the first time, how models and files actually flow, what turnaround really means once you count everything, and how to measure a laboratory instead of having a feeling about one.
Nothing here tells you what to prescribe, what material a case should be made from, or whether a returned restoration is acceptable. Those judgments are the treating dentist's, and the prescription is signed by a dentist for that reason. What a team member may do in preparing, sending and checking in a case, and what a laboratory is required to disclose or record, varies by state, so confirm the rules that apply where you practice through your dental board and our state pages. This site holds no accreditation and no CE provider status, and nobody clinical has reviewed it.
What you will learn
- The information a laboratory needs on every case, and what happens when a field is left blank.
- What a laboratory prescription contains and why it functions as a record rather than a note.
- How to communicate shade so it survives the trip, including lighting, timing and photographs.
- How physical models and digital files each move through a laboratory, and who owns what.
- How to calculate real turnaround, handle remakes without an argument, and score a lab on evidence.
What a Lab Actually Needs From You
Ask a technician what makes a good office to work for and you will hear the same list every time. It is not glamorous and it is entirely within your control.
- A complete, legible prescription with nothing left to inference.
- A record they can work from, whether that is a physical impression or a scan file.
- The opposing arch and a bite record. A laboratory cannot build something to meet teeth it has never seen.
- Shade information with enough context to be useful, which usually means photographs.
- A realistic due date, set from the patient's actual appointment rather than from optimism.
- A named contact who answers. When a technician calls with a question at 9am, the difference between a two minute answer and a two day wait is the difference between a case on time and a case late.
Here is what happens when one of those is missing: the technician makes a judgment call. Sometimes it is a good one. Either way, a decision that belongs to your dentist has quietly been made by somebody who has never seen the patient, and nobody in your office knows it happened.
The Prescription
Call it a prescription, a work authorization or an Rx. Whatever your lab's form says at the top, it is the instruction set and it is part of the patient's record. It is signed by a dentist because the work is being ordered under a dentist's license, and both the practice and the laboratory keep a copy.
Fields you will see on almost any form:
| Field | What it is for | Where it goes wrong |
|---|---|---|
| Patient identifier | Matching the case to the right person and the right appointment | Initials only, or a name so common the lab has two of them |
| Doctor and practice details | Who ordered it, under whose license, where it goes back to | Group practices where the case comes back addressed to whoever is not working that day |
| Tooth number or numbers | The obvious one | Numbering written in a system the lab does not use, or a range where a list was meant |
| Restoration type | Crown, onlay, bridge, veneer, and how many units | A bridge described by its end teeth without stating what the middle is |
| Material | What it is made from | A brand name for a family of products with several variants |
| Shade and characterization | Color and surface detail | A single shade tab for a front tooth, with nothing about translucency or staining |
| Special instructions | Anything the dentist wants that is not on the form | Handwriting, and the fact that "usual" means nothing to a new technician |
| Due date and seat date | The laboratory's schedule | A due date equal to the appointment date, leaving zero margin |
| Signature | Authorization | Missing, which in some places stops the case entirely |
Two habits are worth adopting immediately. Keep a copy of every prescription with the case in your own records, not just in the lab's system, because it is the document you will want if a case is disputed. And if your practice sends a lot of similar work, ask your dentist to write a standing preferences sheet for your main laboratory covering the things they want every time. It removes an entire class of phone call.
Shade, and Why It Goes Wrong So Often
Shade is the most common reason a restoration comes back that fits perfectly and still cannot be seated. It is also the part of the process most within reach of a well trained team member.
Timing
Shade gets taken early in the appointment, before the tooth has been isolated for a long stretch. A tooth that has been kept dry looks lighter than it did when the patient walked in, and a shade taken at that moment can send the laboratory in the wrong direction. Early, then, and quickly rather than by staring.
Lighting and environment
Put the operatory light off the face rather than blasting it. Use the most neutral light available, ideally a color-corrected source or indirect daylight. Then remove the things nobody thinks about: a bright bib, a vivid lipstick, a phone screen, a brightly colored wall right behind the chair. Eyes also fatigue, so long comparisons get less accurate rather than more.
Guides and systems
Shade guides come in systems, and the systems do not map cleanly onto each other. If your office uses one guide and your laboratory works to another, somebody is translating, and translation loses information. Confirm which system your lab wants and use that one. Guides also age and get dirty, and a guide that has been through the sterilizer in a way the manufacturer did not intend is no longer a reference for anything.
Photographs
This is the biggest single improvement most offices can make. A letter and a number describe one dimension of a tooth. A photograph with the shade tab held in the same plane as the tooth, in frame, in focus, with the patient's other teeth visible, gives a technician something to work against. For anterior cases, some laboratories will ask the patient to come in for a custom shade appointment, which is worth the patient's time on a case where appearance is the entire point.
Write down which camera or phone, which lighting, what distance, tab position, and how the file gets named and attached. Take the same photo the same way every time. A consistent mediocre photo is more useful to a technician than an inconsistent excellent one, because they learn to read yours. Then attach it to the case the same way every time so it never arrives separately from the prescription.
Models, Files, and Who Owns What
The conventional path
An impression arrives at the laboratory, gets disinfected again, and gets poured into a model. The working model is sectioned so individual prepared teeth can be handled as dies. Models get mounted on an articulator using your bite record so the technician can see how the arches meet. The restoration is built against that. Everything physical eventually gets stored for a period and then discarded according to the lab's policy. Cases coming back into your building get handled the same way in reverse, which is a surface disinfection task covered in the surfaces and PPE lesson.
The digital path
A scan file is exported and uploaded. The technician designs on screen, and from there the case either gets milled or printed directly, or a model gets printed to work on. Plenty of cases now run model-free entirely.
The digital path raises questions the physical one never did, and most practices have not answered them:
- Where do the files live, and are they backed up as patient records rather than as scanner data?
- What format do they export in, and will your next laboratory be able to open them? Closed ecosystems are convenient right up to the moment you want to leave one.
- Who owns the design file if the laboratory designed it? Ask before you need to know.
- How long are files kept, by you and by them, and does that match your records retention obligations? Those obligations vary by state, so check yours.
Physical cases carry patient information out of your building, which makes case handling a privacy question as well as a logistics one. The HIPAA lesson on what counts as protected information includes case pans and prescriptions for exactly this reason.
Turnaround, Remakes, and Measuring a Lab
Real turnaround is not the number on the price list
Laboratories quote in-lab working days. That is the time the case spends being made, and it is the smallest component of the total. Real turnaround is your case-out day, plus transit, plus in-lab days, plus transit back, plus your check-in day, plus a buffer for the case that comes back needing something.
Work it out for your own office rather than borrowing anyone's figure. One practice might find that a case leaving Tuesday afternoon does not actually reach the bench until Thursday, because their courier runs on alternate days and the lab logs overnight arrivals the following morning. That practice needs to schedule differently from one across town using the same lab with daily pickup. Measure yours, write the number on the scheduling template, and revisit it when the lab or the courier changes.
Remakes
Remakes are normal. Pretending otherwise is how offices end up with a laboratory relationship that is polite and useless. What you want is a written policy before you need one, covering who pays in which circumstances. The usual categories:
- Laboratory error. Made wrong against a clear prescription. Almost always remade at the lab's cost.
- Record problem. The impression, scan or bite did not contain what the technician needed. Usually the practice's cost, and usually avoidable.
- Shade. Often disputed, which is exactly why the photograph matters so much.
- Change of plan. The dentist or patient wants something different. The practice's cost.
- Breakage in transit or handling. Sort this out in the policy, because it is the one nobody discusses until it happens.
The invoice is the small part of a remake. The expensive part is the chair time you cannot rebook, the patient in a provisional for another two weeks, and the confidence you spend explaining it. That lab fee also sits inside a fee the plan has already decided what to allow, which is why remakes hit an in-network practice harder than the invoice suggests. The fee schedules lesson explains that math. Document remakes with the cause attached, every time, because a remake log is the only way to tell a laboratory problem from an office problem.
Scoring a laboratory on evidence
Keep a simple running record for a quarter and you will know more about your lab than most practice owners ever do. Track:
- Cases sent, cases returned on time, cases late.
- Remakes, with the cause category.
- Time from try-in to cement at the seat appointment. A lab whose work seats quickly is saving you money invisibly, and that number is the one most worth watching.
- Calls received from the lab. Counterintuitively, a lab that calls with questions is usually a better lab than one that never does.
- Whether they tell you when something is wrong before you find out.
Then have the conversation with evidence in hand rather than a feeling. Our guide to choosing a dental lab covers the selection side, including questions worth asking about where work is actually made and what a laboratory is required to disclose, which differs by state.
Try this in your own office
- Pull the last ten prescriptions you sent and read them as a stranger. Mark every field a technician would have to interpret. That list is your improvement plan and it usually takes one meeting to fix.
- Calculate your real turnaround. Track case-out date, arrival date, return date and check-in date for ten cases. Compare the total to the number you have been scheduling against.
- Write the shade photo recipe and tape it next to the camera. Same lighting, same distance, same tab position, same file naming, same attachment method.
- Get your laboratory's remake policy in writing. Ask specifically about shade, records and transit damage. Keep it with your vendor file, not in somebody's inbox.
- Start a remake log with a cause column and commit to a quarter of honest entries, including the ones that are your office's fault. Without the cause column the log tells you nothing.
- Ask your lab what they wish your office did differently. Ask the technician, not the sales rep, and be prepared to hear something useful about your bite records.
THE CHAIRSIDE TAKE
Treat your laboratory as a partner you measure rather than a supplier you complain about, and start with the two things entirely inside your control: complete prescriptions and a standardized shade photograph. Those two habits will remove more remakes than switching labs ever will, and switching labs is what most practices try first. Then track real turnaround, count remakes with causes attached, and pay attention to how long your doctor spends between try-in and cement, because that quiet number tells you more about a laboratory's quality than any price list. If your lab never calls you with questions, that is not a compliment. Find out what they are guessing about.
Lesson 4 of 6 in Understanding Restorative Dentistry
This guide is educational content and does not constitute legal, financial, tax, or clinical advice. Laws and regulations vary by state and change over time. Consult your own dental-specific attorney, CPA, and state dental board before acting.