Although intraoral scanners can replace traditional impressions in the majority of cases, certain complex clinical situations still benefit from combining both methods. This hybrid approach offers the highest level of accuracy assurance.
Recommended Scenarios for Combined Use
Long-span implant restorations (4 or more implants)
Conventional intraoral scan stitching error increases with span length. An open-tray silicone impression can serve as the gold-standard verification of implant positions. Scan soft tissue and adjacent teeth digitally first, then capture precise implant positions with silicone. The laboratory can fuse both datasets.
Fully edentulous implant cases
High soft-tissue mobility and lack of anatomical landmarks limit conventional intraoral scanner accuracy. Silicone impressions should be the primary method, with digital data used as a secondary reference for mucosal texture and aesthetics. Photogrammetry is preferred when available.
Unstable occlusion
Patients with multiple free-end saddles, severe wear, or temporomandibular joint issues often cannot provide a reliable intraoral bite. A stable physical bite registration (e.g., Blu-Mousse or similar silicone) combined with the digital scan provides more dependable jaw relation data.
Large inter-implant angulation differences
When implant angles diverge significantly, scan bodies may interfere with each other or become difficult for the software to recognize correctly. Silicone impressions remain more reliable in these situations.
Deeply subgingival margins
When gingival retraction is difficult and bleeding is hard to control, conventional silicone impression material can flow into the sulcus and capture fine margin details that digital scanning may miss.
High-precision aesthetic restorations
Multiple anterior veneers or full crowns demand extremely high marginal accuracy. Some clinicians still prefer dual verification with both digital and conventional impressions.
Practical Combination Methods
Method 1: Complete a full intraoral scan first, then take a silicone impression and pour a stone model. Scan the stone model with a laboratory scanner and compare or fuse the two datasets.
Method 2: Use the intraoral scan for the arches and a silicone bite registration for the occlusal relationship (bite data taken from the physical record).
Method 3 (implants): Digitally capture soft tissue and adjacent structures, then record implant positions with an open-tray silicone impression. The laboratory merges the datasets.
Current Perspective
As intraoral scanner accuracy and photogrammetry technology continue to improve, the number of cases requiring dual verification is steadily decreasing. Nevertheless, in complex or high-stakes situations, the "dual insurance" approach remains a prudent clinical choice.
How the Aident Digital Workflow Supports Hybrid Cases
Even when a hybrid technique is chosen, a high-performance intraoral scanner still plays a valuable role in capturing soft tissue, adjacent teeth, and aesthetic information. The Aident AI-30 Intraoral Scanner integrates smoothly into combined workflows with:
≤10 μm accuracy for reliable soft-tissue and preparation data
20–25 mm ultra-deep depth of field
Powder-free true-color imaging with intelligent anti-fog heating
Lightweight design (156–198 g) for efficient clinical use
Fully open STL/PLY/OBJ output that allows easy data fusion with laboratory scanners and CAD systems
Aident's complete digital ecosystem (intraoral scanner + lab scanner + 3D printers) further supports efficient model production and verification when hybrid data are used.
Achieve Maximum Confidence in Complex Cases
Knowing when to combine digital and conventional impressions helps clinicians deliver the highest possible accuracy for challenging restorations. Pair clinical judgment with reliable scanning technology for the best outcomes.
Explore the Aident AI-30 and complete digital dentistry solutions:
https://www.aident3d.com/3d-scanner/intraoral-scanner/
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https://www.aident3d.com/contact-us
Complex cases deserve the highest level of accuracy assurance - choose technology and protocols that support both pure digital and hybrid approaches.
