Intraoral Scanning vs Traditional Impression: What Clinicians Need to Know

Introduction

Many clinicians still find themselves deciding case by case whether to use intraoral scanning or stick with traditional dental impressions. Both approaches can work well, but they behave differently in daily practice — from how patients experience the appointment to how reliably the data performs once it reaches the design software or milling machine. Looking at these practical differences helps teams choose the method that fits each situation.

Accuracy Comparison: Digital Scans vs Conventional Impressions

Accuracy is often the first concern when moving away from traditional impressions. Conventional techniques have been refined over decades and can deliver reliable results when executed carefully. However, they remain susceptible to distortion during tray removal, material shrinkage, and inconsistencies in mixing or setting time.

Digital intraoral scanning generally offers excellent accuracy for most restorative and implant cases when proper technique is used. Modern scanners capture fine detail with high repeatability, particularly on prepared teeth and implant scan bodies. The key advantage lies in consistency — once the operator masters scanning technique, results vary less between different clinicians compared with hand-mixed impressions. Many practices notice that digital data reduces the frequency of remakes caused by distortion, especially in cases involving multiple preparations or implant-supported restorations.

Clinical Implications of Accuracy Differences

For single crowns and small bridges, both methods can achieve clinically acceptable fit. The difference becomes more noticeable in larger cases or when multiple units must align precisely. Digital scans tend to maintain better marginal integrity across the entire arch because there is no physical distortion from material removal. Many clinicians report fewer adjustments at try-in when working from high-quality digital data.

Patient Comfort and Chairside Efficiency

Patient experience often improves noticeably with intraoral scanning. Traditional impressions can trigger gag reflexes, cause discomfort from tray pressure, and require patients to sit still while material sets. These factors can make appointments longer and more stressful, especially for anxious or pediatric patients.

Scanning eliminates most of these issues. The process is faster for many cases, requires no mixing or setting time, and allows patients to close their mouths between scans. Chairside efficiency also improves because clinicians can immediately review the scan on screen and correct any missed areas before dismissing the patient. This reduces the chance of having to call patients back for retakes. Over time, the reduced physical strain on staff and improved patient experience often contribute to higher satisfaction scores and smoother daily operations.

Common Intraoral Scanning Challenges

While digital scanning offers many advantages, it is not without limitations. Clinicians new to scanning often encounter specific challenges that can affect data quality if not addressed properly.

Moisture Control and Margin Visibility

Moisture remains one of the most common obstacles. Saliva, blood, or crevicular fluid can obscure margins and create artifacts in the scan. Effective isolation and drying techniques are essential, particularly around subgingival margins. Some cases still require retraction cord or other isolation methods to achieve clean, readable margins.

Full-Arch Scanning Considerations

Full-arch scans can be more demanding than quadrant scans. Maintaining consistent scanner positioning across the entire arch while managing soft tissue and patient movement requires practice. In cases with significant crowding, limited opening, or mobile teeth, achieving complete and accurate data can take longer and may still require conventional impressions as a backup. Experienced users often develop specific scanning strategies and sequences that help overcome these difficulties in most situations.

How High-Stability Scanners Improve Data Capture

Scanner hardware plays a significant role in overcoming common challenges. Devices designed with stable optics and reliable tracking perform better in real clinical conditions, especially when moisture or patient movement is present.

The BSM M5 Pro stands out in this regard. Its stable optical module and ergonomic design help clinicians maintain consistent scanning paths, while fast data acquisition reduces the time patients need to keep their mouths open. These characteristics make it easier to capture clean data even in moderately challenging conditions, supporting more predictable results for both simple and complex cases. Many users also appreciate the open data format, which allows seamless transfer into various design and milling software without compatibility issues.

Impact on Downstream CAD/CAM and Milling Accuracy

The quality of the initial data directly affects every subsequent step in the digital workflow. Poor scan data can lead to design difficulties, fit issues during milling, and increased chairside adjustments.

High-quality intraoral scans integrate well with modern CAD software and milling systems. When the digital model accurately represents the prepared teeth and surrounding structures, milling machines can produce restorations with better marginal fit and occlusal accuracy. This reduces the need for extensive adjustments and improves overall case efficiency.

Milling systems such as the BSM 520W and 500DW are designed to take full advantage of precise digital data. Their robust construction and refined milling parameters help translate accurate scans into well-fitting restorations. When combined with reliable scanning, these machines support consistent outcomes across a range of restorative cases, from single units to more complex frameworks.

When Traditional Impressions Are Still Applicable

Despite the advantages of digital scanning, traditional impressions still have a place in certain situations. Understanding when to use each method helps clinicians choose the most appropriate approach for each case.

Some full-arch cases with significant soft tissue undercuts, limited patient opening, or heavy bleeding can still be difficult to scan reliably. In these situations, a well-executed conventional impression may provide more complete and usable data. Additionally, some clinicians prefer traditional methods for specific implant cases or when working with certain types of provisional restorations.

Many practices adopt a hybrid approach. They use intraoral scanning for the majority of cases where it performs well, while keeping traditional impression materials available for situations where scanning proves challenging. This flexibility allows teams to maintain efficiency without compromising on case quality.

Conclusion

Both intraoral scanning and traditional impressions can deliver good clinical results when used appropriately. Digital scanning generally offers better patient comfort, improved chairside efficiency, and more consistent data for downstream CAD/CAM workflows. However, it requires attention to technique, especially regarding moisture control and full-arch cases. The decision is rarely about choosing one method forever, but rather about matching the tool to the demands of each individual case.

High-performance scanners help overcome many of these challenges, while reliable milling systems ensure that accurate data translates into well-fitting restorations. For most practices, a thoughtful combination of digital and conventional methods — chosen based on the specific demands of each case — provides the best balance of efficiency and clinical quality. This flexible approach allows teams to take advantage of digital benefits without forcing every case into a single workflow.

Clinicians looking to strengthen their digital capabilities often find value in evaluating scanners and milling equipment that work well together as part of a complete workflow. Solutions from providers like Besmile are developed with these practical considerations in mind. More information is available at bsmdental.com for teams interested in exploring options suited to their clinical needs and case mix.