How to Evaluate a Dental Lab's Quality System Before You Send the First Case

Switching labs is a chair-time risk. A missed margin on a first case burns 45 minutes of provider time, a temporary you have to remake, and a patient conversation you did not want to have. So the question is not whether the new lab has nice photography on their site. The question is whether their quality system will hold under a real caseload.

Here are the six areas to audit before you send case one. This is written for general dentists, prosthodontists, and small DSO ops leads (10 to 30 offices) who are evaluating a lab partnership, not for lab-to-lab milling procurement.

1. Ask for the remake rate, in writing, with the definition

Every lab quotes a remake rate. Most of them are quoting different numbers.

Ask three specific things:

• What percentage of units shipped in the last 12 months came back as remakes?
• Does that number include adjustments (occlusal grind-ins the doctor does chairside) or only full remakes where the unit was returned to the lab?
• Is the number reported per unit or per case? A three-unit bridge is one case but three units, and the difference matters when a lab tells you 1.8%.

An industry-honest full-remake rate on crown and bridge sits in the low single digits. Labs that report under 1% are either counting differently or not counting units the doctor adjusted and did not send back. Neither is a red flag on its own, but you want the definition on the record so you can compare apples to apples six months in.

At Dani Dental ask a lab how it defines a remake: per unit? within what window? The definition matters as much as the number. We publish the definition because comparing bare numbers across labs without the definition is meaningless.

2. Audit the digital workflow, not just the CAD software

"We use exocad" or "we use 3Shape" is table stakes. The audit question is what happens between the intraoral scan landing in the lab inbox and the mill starting.

Specifically:

• Who reviews the scan for margin clarity before it goes to design?
• What is the escalation path if the scan is unusable? Do they call the office within a stated window, or do they design around the ambiguity and hope?
• Is there a design review step by a second technician before the file goes to mill, or does one CAD technician own the file end to end with no second set of eyes?

On full-arch and complex anterior cases the second-technician review is where most avoidable remakes get caught. Ask directly. If the answer is vague, that is your answer.

3. Verify material traceability

For every unit that ships, the lab should be able to tell you, months later:

• Which zirconia puck it came from (manufacturer, lot number, shade batch)
• Which sintering cycle it went through
• Which technician stained and glazed it
• Which QC checkpoint signed off before packaging

This is not paranoia. This is what you need if a patient shows up 14 months in with a fracture and you are trying to figure out whether it was material, design, or bite. A lab without lot-level traceability is a lab that cannot help you diagnose a failure. That is a real cost, not a theoretical one.

The DSO version of this question

For multi-office operators the traceability question extends to consistency across locations. If office A and office C both send crown and bridge cases to the same lab, are they getting the same material specification, the same shade protocol, the same margin design conventions? Ask for the case-book on file for each office. If the lab does not maintain office-level preference profiles, you will get variance you cannot control.

4. Look at the CE and continuing education output

This one sounds tangential and is not. A lab that runs continuing education courses, publishes case documentation, or hosts study clubs is a lab whose technicians are being pushed to teach what they do. Teaching forces the QC process into daylight. Labs that never publish, never present, never open the bench to visitors tend to have QC systems that are informal and person-dependent.

Ask what CE the lab has hosted or contributed to in the last 18 months. Ask if you can visit the bench. A working lab will say yes to the bench visit or explain the specific reason (usually a materials cleanroom protocol). A lab that says no with no reason is telling you something.

5. Test the communication protocol before you sign

The number one reason dentists leave labs is not price and it is not quality. It is communication. Specifically: the lab rep who does not call back, the technician who cannot be reached, the case status that requires three emails to find.

Before you send case one, run this test:

• Call the lab main line at 2pm on a Tuesday. How long to reach a human?
• Ask for the technician who would be assigned to a hypothetical anterior case. Are they reachable, or is there a wall between the bench and the phone?
• Ask what happens if a case is running late. Do they call you before the ship date passes, or do you find out when the case does not arrive?

Write down the answers. Six months in, compare against actual performance. Labs that talk a good communication game and then hide behind a portal are common. Labs where the technician on your case will pick up their own phone are the ones worth keeping.

6. Get the turnaround SLA in writing, not just the average

"Our average turnaround is 7 business days" is a marketing number. The operational number is:

• What is the committed turnaround on standard crown and bridge?
• What is the committed turnaround on full-arch cases from digital impression to try-in?
• What is the escalation and credit policy when the SLA is missed?

A lab that will not commit to a turnaround SLA in writing is a lab that reserves the right to slip whenever their queue gets tight. That is fine when their queue is not tight. It is not fine in November when everyone is trying to close cases before year-end and your seat appointment is on the schedule.

What to do with the answers

Run these six audits before you send case one. Score the answers. Save the scores. Compare against six-month actuals.

If you want the version of this audit we hand to prospective partners, ask for our lab operations sheet. It is the same six questions with our numbers filled in, our technicians named, and our SLA in writing. That is the point of the audit: the lab you want to work with is the one that answered the questions before you asked.