Why Analogue Impressions Are Still Better Than Digital Scans for Complete Denture Cases

Digital dentistry has transformed our profession. From same-day crowns and guided implant surgery to digital smile design and aligner therapy, there is no doubt that intraoral scanners have changed the way we work.
At Bremadent Dental Laboratory, we embrace digital technology every day. We receive thousands of digital files each year and use advanced CAD design, 3D printing, milling, and digital workflows across multiple disciplines.

However, there is one area where we continue to see a significant difference between digital and conventional techniques. Complete dentures.
While digital impressions have their place in removable prosthetics, our experience consistently shows that traditional analogue impressions still produce superior results for full denture patients.

That statement may surprise some clinicians, particularly as manufacturers continue promoting digital denture workflows as the future of removable prosthodontics. The reality, however, is often more nuanced.

As a laboratory that manufactures a high volume of complete dentures, immediate dentures, copy dentures, implant-retained dentures, flexible partial dentures, chrome dentures, and acrylic partial dentures, we have a unique perspective on what works well in everyday clinical practice and what creates challenges further down the workflow.

The difference comes down to one simple fact.  An intraoral scanner captures what it sees. An impression captures what it feels. That distinction is far more important than many clinicians realise.

The Difference Between a Photograph and an Impression
A useful way to think about an intraoral scanner is as a highly sophisticated camera.

• It records surfaces.
• It captures shapes.
• It creates a digital representation of the anatomy visible to the scanner.
• For many restorative procedures, this is ideal.
• Teeth are hard tissues.

Crowns, bridges, inlays, onlays, implant restorations, and orthodontic appliances are largely based on static structures.
Denture-bearing tissues are completely different. The tissues that support a complete denture are dynamic.

• They move during speech.
• They move during swallowing.
• They move during chewing.
• They move during smiling.
• They move when the patient opens widely.
• They move when the patient closes.

An intraoral scanner captures a snapshot of these tissues in one particular moment. A conventional impression captures how those tissues behave under functional conditions. This is one of the biggest reasons analogue impressions continue to outperform digital scans for complete dentures.

Soft Tissue Compression Matters
One of the key objectives when constructing a successful complete denture is achieving stability and retention.
This relies heavily on how the denture interacts with the soft tissues.

Traditional impression materials allow clinicians to record tissue displacement and compression.
This is particularly important in areas where support and retention are critical.

A scanner simply records the tissue in its natural resting state. It cannot replicate the controlled compression achieved during impression taking. This may seem like a small difference.

In reality, it can be the difference between a denture that feels secure and one that constantly moves during function.
The patient may not understand why one denture feels better than another. They simply know when it works.

Border Moulding Cannot Be Fully Digitised
Ask any experienced prosthodontist or Clinical Dental Technician what contributes to successful denture retention and you will almost certainly hear the term border moulding. Border moulding remains one of the most important steps in complete denture construction.

It allows the clinician to record functional movements of the lips, cheeks, frenal attachments, vestibules, and surrounding musculature. This creates a customised extension that works with the patient's anatomy rather than against it. Current intraoral scanners simply cannot replicate this process accurately. The scanner captures anatomy. The impression records function. That distinction matters enormously when designing a denture that remains stable during everyday use.

Muscle Attachments Influence Every Denture
Every denture patient has unique muscle attachments. Some patients have high frena. Some have shallow sulci.
Others have strong muscle activity around the buccal shelves or labial vestibules. Traditional impression techniques allow clinicians to actively record these functional movements. The impression material flows around the anatomy during movement.

The resulting impression becomes a dynamic record of function. Digital scans record a static image. The scanner has no understanding of muscle activity. It simply records what is visible at that moment.

For complete dentures, this limitation can significantly affect the final outcome.

Anatomical Landmarks Are Often Better Captured Conventionally
Successful denture construction relies on accurate recording of key anatomical landmarks.
These include:
• Retromolar pads
• Hamular notches
• Buccal shelves
• Labial sulci
• Lingual sulci
• Mylohyoid regions
• Posterior palatal seal areas

In our laboratory, we have noticed a growing trend in digital submissions where less anatomy is being captured.
Many scans arrive with incomplete vestibular detail. Some scans stop short of important functional areas.
Others lack sufficient depth within the sulcus. The result is a digital model that may look impressive on screen but lacks the information required to create an optimally fitting denture. A beautiful digital file is not necessarily a complete clinical record.

Where Digital Scanning Works Extremely Well
It is important to clarify that we are not against digital dentistry.
Far from it.
In fact, we have seen excellent results with digital workflows for:
• Flexible partial dentures
• Chrome cobalt dentures
• Acrylic partial dentures
• Copy Dentures (With analogue impression)
• Immediate partial dentures
• Orthodontic appliances
• Retainers
• Implant restorations
• Crown and bridge work

The reason is simple. Most of these restorations are primarily tooth-borne. The teeth provide stable reference points.
Retention relies less on soft tissue dynamics. The scanner can accurately capture the structures required.
In these situations, digital impressions often outperform conventional techniques.

Complete dentures are different because they are almost entirely tissue-borne. The supporting anatomy behaves very differently.

Copy Dentures Are an Exception Where Digital Can Work Very Well
One area where we have seen excellent results with digital workflows is copy dentures.
However, there is an important distinction. The most predictable outcomes tend to occur when a light body impression material is first placed inside the patient's existing denture before scanning. This allows the fitting surface of the denture to capture the soft tissue detail, functional anatomy, and tissue adaptation that the patient has already been wearing successfully.

The scanner is then used to digitise the denture and impression together. In effect, the clinician is combining the advantages of both analogue and digital techniques.

The impression records the tissue relationship, while the scanner captures the shape, tooth position, occlusion, flange contours, and aesthetics of the existing prosthesis.

This hybrid approach often produces highly predictable copy dentures because the laboratory receives information about both the denture and the tissues supporting it.

By contrast, simply scanning the denture on its own only captures the hard acrylic surfaces. It provides no information about how the denture relates to the patient's soft tissues, whether there are pressure areas, loss of adaptation, tissue changes, or areas where support may have altered over time.

When a light body wash impression is taken inside the existing denture before scanning, the laboratory gains significantly more clinical information and can often produce a more accurate and better-fitting copy denture.

This is a perfect example of how digital dentistry works best when it complements proven clinical techniques rather than attempting to replace them entirely.

What We Are Seeing More Frequently
One trend we have observed over recent years is a reduction in the amount of anatomy being captured in digital denture scans. This is not necessarily a scanner problem. In many cases, it appears to be a workflow issue.
Clinicians are becoming increasingly confident with scanning technology.

Unfortunately, confidence can sometimes lead to assumptions.

• The scan appears complete.
  
• The software shows a green tick.
• The file uploads successfully.

However, when the laboratory examines the scan carefully, important anatomical information may be missing.
The scanner can only work with what it has been shown. If the vestibule is not scanned, it cannot be recreated.
If the posterior extension is incomplete, the software cannot guess where it should be.

The laboratory cannot manufacture anatomy that does not exist within the dataset.

The Laboratory Perspective
One of the advantages of working in a busy dental laboratory is the ability to compare hundreds or thousands of cases over time. Patterns begin to emerge. When analysing complete denture remakes, adjustments, and retention issues, we consistently see stronger outcomes from well-executed conventional impressions. That does not mean every conventional impression is perfect.

Nor does it mean every digital denture case fails. What it does mean is that conventional impression techniques currently provide more clinical information for the laboratory to work with when manufacturing complete dentures.
More information generally leads to more predictable outcomes.

Technology Should Support Clinical Principles
Digital dentistry continues to evolve rapidly.

• Scanner technology will improve.
  
• Software algorithms will improve.
• Artificial intelligence will improve.

At some point, digital denture workflows may fully replicate everything that conventional impressions achieve.
We are simply not there yet. The most successful clinicians recognise that technology should support sound clinical principles rather than replace them. The goal is not to be digital for the sake of being digital. The goal is to achieve the best possible outcome for the patient. Sometimes that involves using the latest technology. Sometimes it involves using techniques that have stood the test of time. The most effective practitioners understand the value of both.

The Takeaway
Digital impressions are an outstanding tool for many areas of dentistry and removable prosthetics. We use them every day and appreciate the efficiencies they bring. We have also seen excellent results when scanning existing dentures for copy denture workflows, particularly when a light body wash impression is first taken inside the denture before scanning.

However, based on our experience manufacturing complete dentures on a daily basis, conventional analogue impressions continue to provide superior information for recording soft tissue anatomy, border extensions, muscle attachments, functional movements, and denture-bearing tissues.

For flexible dentures, chrome dentures, acrylic partial dentures, copy dentures using a wash impression technique, and tooth-supported restorations, digital workflows often perform exceptionally well.

For complete dentures, the traditional impression still remains the gold standard. Sometimes the oldest techniques survive for a reason. Not because they are traditional. Because they continue to work.

We provide a trusted laboratory service delivering consistent quality, saving chairside time, and supporting predictable patient outcomes.

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