How to Identify a Bad Digital Implant Impression Early?

Why Digital Implant Impressions Can Fail?

While digital impressions offer speed, comfort, and precision, the results are only as good as the data captured. The most common problems are scan artifacts, incomplete datasets, and moisture contamination which are responsible for the compromised final prosthetic fit.

Key Indicators of a Bad Digital Implant Impression

1. Graininess or Artifacts in Scan Data

One of the first red flags is the detection of grainy areas or blebs in the scan, especially near the implant collar and adjacent teeth. These can be caused by:

• Contamination of saliva or blood during scanning

• Incorrect smoothing of missing data by autofill features

• Poor scanning technique or movement

Always switch to model mode to closely examine surface textures.

2. Missing or Incomplete Details

Critical areas often missed in a bad dental impression include:

• The implant shoulder

• Adjacent gingiva

• Opposing teeth

• Occlusal surfaces

Incomplete scans may result in the creation of artifacts that confuse lab technicians, ultimately having a negative impact on the crown's fit and function.

3. Internal Bubbles or Fluid Pockets

Although the digital workflows do not involve the use of physical impression materials, bubbles can still form during digital impression scanning - especially when capturing reflective or moist surfaces. These bubbles can obscure the boundaries of the preparation, resulting in misalignment of the restorations.

Clinical Signs That the Impression Is Problematic

Poor scans are usually detected by clinical signs once the restoration is in the mouth:

• High occlusion: The crown feels taller and causes discomfort when the person is biting.

• Implant mobility: Due to poor fitting, the crown can apply uneven forces, which can eventually lead to the destabilization of the implant.

• Signs of infection: Bleeding gums, bad taste, or swelling around the implant may indicate peri-implantitis that has been triggered by bacterial infiltration through poor marginal sealing.

How to Evaluate a Digital Impression Effectively?

To catch the errors early and prevent the remakes:

• Verify margin clarity: The margins must be very clear and neat, especially in the subgingival areas.

• Check occlusion: Confirm the alignment by using either articulating paper or the digital bite analysis method.

• Assess insertion path: There should be a clear path for crown insertion shown by the scan, with no undercuts or overlaps.

• Compare with intraoral view: Always perform a comparison between the digital impression and the actual intraoral anatomy before proceeding.

Top Causes of Bad Digital Impressions

Understanding the root causes of error is the most essential thing in digital impression dentistry. Below are the most common ones:

Poor Scan Technique

Human error, such as scanning too fast, not drying the area, or incorrect scan overlap, can lead to full-arch scanning errors.

Surface Contamination

All the materials, like adhesives, buildup, or even latex from gloves, can have a negative impact on the scanner's ability to capture the details.

Bite Misregistration

A bite scan that does not match the actual occlusion of the patient will lead to high spots and poor contacts in the final restoration.

Inadequate Visualization

Deep sulcus or subgingival margins will always need either retraction or a laser for proper exposure - tools like ARCHTRACER can help ensure no critical scan data is lost. If not done, then you will lose critical data.

How to Fix a Bad Scan Before It Reaches the Lab?

You do not always need to restart from scratch. Here are a few options that you can do: 

• Rescan selectively: Most of the modern scanners are able to isolate the affected areas that need to be scanned again.

• Dry the area properly: Clean the area of saliva, blood, and moisture before rescanning in order to minimize artifacts.

• Avoid autofill reliance: Scan manually all important structures rather than depending on system-generated fills.

• Use scan bodies correctly: Ensure that they are completely seated and have full visibility in the scan - for complex cases, intraoral photogrammetry can help capture implant positions more precisely. Missing scan body data can completely displace the implant position.

Differences Between a Good and Bad Digital Impression

Best Practices to Ensure Accuracy in Digital Impressions

These are a few disciplined habits that can significantly reduce scan errors if they follow:

• Calibrate your scanner regularly

• Train the team on proper retraction and moisture control

• Use powder-free gloves or vinyl gloves to avoid contamination

• Verify the scan before sending it so that any problems can be identified while the patient is still present.

• Avoid rushing, especially when placing retraction cords or during tissue management.

Why Early Detection Matters?

The consequences of a bad dental impression may not be immediately observable, but a poor fit, discomfort, and costly remakes are sure to come sooner or later. Identifying problems before sending the scan to the lab not only saves time and money but also protects the health of the patient's implants.

Final Thoughts

The detection of mistakes in the digital impression scanning process must be done early in order to ensure clinical success and patient satisfaction. At Digital Arches, we are providing the clinicians with the digital workflows that are of the highest level in order to speed up the delivery of the results of the best quality. If you want to enhance your digital implant workflows or need someone who is an expert in handling the case to support you, don't hesitate to get in touch with us.