A factory audit for dental equipment should answer one question: can this supplier repeat the device you approved, batch after batch, when nobody from your company is watching? Certificates answer a different question, which is whether a management system exists on paper. A useful factory audit dental equipment programme scores five dimensions, asks for evidence at each one, and treats a missing record as a finding rather than a personality clash.
This guide sets out the five dimensions, the evidence to request before the visit, what to look at on the floor, how to score the result so it can be compared across suppliers, and the red flags that end an audit early.
Why a factory audit dental equipment buyers can defend matters more than a certificate pack
Certification confirms that a quality management system has been assessed. It does not tell you whether the calibration bench is in use, whether the incoming inspection records are filled in on the day, or whether the unit you receive is built from the components in the approved design. Those are the questions that decide whether the second order matches the first.
The five dimensions to score
Score each dimension from one to five, with one meaning no evidence and five meaning documented, practised and traceable. Keep the scoring rubric identical across suppliers, or the comparison will reflect your mood rather than their process.
| Dimension | What good looks like | Primary evidence | Weight |
|---|---|---|---|
| Quality management system | Document control, CAPA, management review with actions closed | Latest audit report, CAPA log, document change history | 20% |
| Production and calibration | Defined workstations, calibrated fixtures, controlled test software | Calibration certificates with due dates, station instructions | 25% |
| Inspection and traceability | Incoming, in-process and final inspection with serial-level records | Inspection sheets for a recent serial number, component lot mapping | 25% |
| Metrology and test capability | Reference artefacts, repeatability data, environmental control | Test reports, gauge R and R, temperature and humidity logs | 15% |
| Documentation and certification scope | Certificates that name the product families actually shipped | Certificate annex, declaration of conformity, labelling samples | 15% |
Supplier audit checklist: documents to request before the visit
Ask for these two weeks ahead. A supplier that produces them quickly is organised; a supplier that produces them on the morning of the audit is improvising, and you will see the same improvisation in production.
- Current certificate with annex, plus the scope statement that names product families.
- Latest internal audit report and the corrective actions that followed.
- Calibration register with equipment ID, interval and next due date.
- One complete device history record for a serial number shipped in the last quarter.
- Incoming inspection specification for the two most critical components.
- Nonconformance and CAPA log for the last twelve months.
- Supplier list for critical components, with approval status.
Read the device history record before you travel. It is the single document that shows whether the process is real, because it links a serial number to components, operators, test results and release. If the record is a folder of blank forms with a signature at the end, the audit has already told you something.
What to look at on the factory floor
Walk the line in process order, not in the order the host prefers. Factory verification is a sequence of checks rather than a tour, and a production line review at each station is what turns a visit into evidence. Start at goods-in, then assembly, then calibration, then final test, then packing. At each station, ask to see the record for the unit currently on the bench and check that the record matches the physical unit in front of you.
- Goods-in: are incoming components segregated by status, and is the inspection record for the last lot signed and dated?
- Assembly: is there a written instruction at the station, and does the operator follow it without being prompted?
- Calibration: is the fixture within its calibration due date, and can the technician show the last calibration result?
- Final test: is the test software version controlled, and does the pass criterion match the specification you were quoted?
- Packing: does the label carry the serial number, the model and the correct regulatory marking for the destination market?
- Nonconforming stock: is there a locked area, and does the log match the physical count?
Metrology: how to test the test equipment
Every accuracy claim rests on a measurement, and the measurement rests on a reference. Ask what reference artefact is used, when it was last calibrated by an external laboratory, and what the repeatability is on a repeated measurement of the same artefact.
For a scanner, ask for ten repeated measurements of a reference artefact and look at the spread, not the mean. A tight mean with a wide spread means the device is accurate on average and unpredictable case by case, which is worse in practice than a small consistent offset. For a printer, ask for dimensional results across the build plate rather than at the centre, because the centre is where every printer performs best. A dimensional check at ±0.03 mm across the plate tells you more than a single central measurement.
Scoring a factory audit dental equipment programme across suppliers
Score during the visit, not afterwards, and write the evidence next to each score. A score without evidence becomes an opinion by the time it reaches a procurement committee.
| Score | Definition | What it means for the order |
|---|---|---|
| 5 | Documented, practised, traceable, and independently verified | Release the order, audit again in 24 months |
| 4 | Documented and practised, minor record gaps | Release the order with a corrective action request |
| 3 | Documented but inconsistently practised | Release a pilot batch, re-audit in 6 months |
| 2 | Partly documented, practice depends on individuals | Do not release volume; require a remediation plan |
| 1 | No evidence, or evidence contradicted on the floor | Stop the audit and reconsider the supplier |
Weight the dimensions, total the score, and set a threshold in advance. A common threshold is four out of five overall with no dimension below three. Set it before the visit, because a threshold invented afterwards is a threshold designed to pass the supplier you already like.
Red flags that justify ending the audit early
Some findings are not fixable within a purchase cycle. If you see any of the following, stop and reassess rather than negotiating harder.
- Certificates that do not name the product family you are buying, with no explanation of how the model is covered.
- Calibration equipment past its due date, or a register that has not been updated for a quarter.
- Device history records completed after the fact, in one handwriting, for several units.
- Test criteria that differ between the quotation and the production station.
- Nonconforming stock stored with release stock, or a log that does not match the shelf.
- No named person accountable for quality, or an accountable person who is also the production manager with no independence.
After the audit: turning findings into contract terms
An audit that ends with a report and no contract change is a wasted week. Convert the findings into three things: a corrective action list with owners and dates, a change notification clause that requires written approval before any component or process change, and a right to re-audit with reasonable notice.
The change notification clause is the one that protects you in year three, when a component supplier changes and nobody tells you. Pair it with a requirement that the device history record be available for any serial number you purchase, and you have a mechanism for investigating field failures that does not depend on goodwill.
Aident's own facility in Bao'an, Shenzhen, covers assembly, calibration, testing and quality control in roughly 2,000 square metres, and the quality system is certified to ISO 13485 and ISO 9001 with CE marking under MDR 2017/745 for the core product families. Buyers are welcome to audit against the dimensions above; review the certificate documentation for the scope, then contact our team to arrange a factory visit and a document pack in advance.
Frequently asked questions
How long does a dental equipment factory audit take?
One full day for a single product family, two days if you are auditing scanners and printers together because the calibration and test stations differ. Add half a day for document review before the visit if you want the floor time spent on evidence rather than paperwork.
Do I need my own auditor?
For a first order above a threshold that matters to your business, yes. A third-party auditor or a quality engineer from your own team will see things a sales-accompanied visit will not. For smaller orders, a structured checklist completed by your own buyer is better than nothing.
Is ISO 13485 enough on its own?
No. It tells you a system exists and has been assessed. It does not tell you whether the specific model you are buying is inside the certified scope, which is why the certificate annex and the declaration of conformity have to be read together with the quotation.
What is the single most useful document to request?
The device history record for one shipped serial number. It is the only document that connects components, operators, test results and release for a specific unit, and it is very hard to produce convincingly if the process is not real.
Run the five dimensions once, score honestly, and keep the record. The second audit takes half the time because you are checking changes rather than discovering the baseline. To start with the documentation, request the download pack, read about the production facility, or review the intraoral scanner family that would be in scope.
