What Is the 3Shape TRIOS Intraoral Scanner?
The 3Shape TRIOS is a handheld digital scanner that creates a precise 3D model of your teeth, gums, and bite. Your dentist or prosthodontist moves a small wand slowly across your teeth. The wand projects structured light onto the tooth surfaces and captures thousands of images per second. Software stitches those images together into a detailed, full-color digital impression.
Traditional dental impressions use a tray filled with putty or alginate. You bite into the material, hold still for several minutes, and wait for it to set. Many patients find this uncomfortable, especially those with a strong gag reflex. Digital scanners like TRIOS were developed to eliminate that step.
3Shape, a Danish company, first released the TRIOS system in 2010. It has since gone through several generations, including TRIOS 3, TRIOS 4, and TRIOS 5. Each version has refined the scanning speed, color capture, and software features. The system is widely used in prosthodontics, orthodontics, and general dentistry worldwide.
How the TRIOS Scanner Creates a Digital Impression
The scanner uses structured light and rapid image capture to build a three-dimensional model of your mouth. Here is what happens during a typical scan.
The Light and Camera System
TRIOS uses a technology called confocal imaging combined with ultrafast optical sectioning. In simpler terms, the wand projects patterns of light onto your teeth. A camera inside the wand reads how that light bounces back. The software uses these light patterns to calculate the exact shape and depth of each surface.
The scanner captures color information at the same time. This means the 3D model on screen looks realistic, with natural tooth shades and gum tones. Some TRIOS models also include a shade measurement feature that assigns a specific shade value to each tooth. A 2023 systematic review of 20 studies found that intraoral scanners showed high reliability in shade selection, comparable to spectrophotometer readings and generally better than conventional visual shade guides. [5]
What You Experience in the Chair
Your provider dries the area being scanned with a gentle air stream. They then guide the wand across your teeth in a specific pattern, typically starting on the biting surfaces, then moving to the cheek side and tongue side. The scan appears on a nearby screen in real time.
The full process typically takes two to five minutes for a single arch (upper or lower teeth). Both arches plus a bite registration may take five to ten minutes. If the scanner misses a spot, the provider simply rescans that area. An in vitro study found that brief scanning interruptions did not significantly affect the overall accuracy of full-arch implant scans, suggesting the software handles gaps in data well. [1]
No powder or spray is required on newer TRIOS models. Earlier generations of some intraoral scanners needed a light coating of titanium dioxide powder on the teeth. The TRIOS system was designed to be powder-free from its introduction.
From Scan to Restoration
Once the scan is complete, the digital file is sent to a dental laboratory or to an in-office milling machine. Lab technicians use CAD software (computer-aided design) to design your crown, bridge, veneer, or other restoration on a computer screen. The design file then guides a milling machine or 3D printer to produce the final restoration.
This digital workflow can reduce turnaround time. Some offices with in-house milling machines can deliver same-day crowns. Others send the file electronically to a lab, skipping the step of physically shipping a putty impression.
What Procedures Use the TRIOS Scanner?
TRIOS is used for any procedure that requires an impression of your teeth, gums, or implants. Below are the most common applications.
Crowns and Bridges
This is the most established use of intraoral scanners. After a tooth is prepared (reshaped) for a crown, the scanner captures the preparation, the neighboring teeth, and the opposing arch. The digital file guides the fabrication of a crown or bridge that fits precisely. A 2021 systematic review of in vitro studies found that digital impressions appear to be as accurate as conventional impressions for single crowns and short-span fixed dental prostheses (bridges of three to four units). [2]
Dental Implants
For implant-supported restorations, the scanner captures the position of implant scan bodies, which are small metal posts placed on top of implants during the scanning appointment. A 2021 study comparing in vitro and in vivo full-arch implant scans found that in vitro (benchtop) accuracy was higher than in vivo (in-mouth) accuracy, and that results varied by scanner brand and number of implants. [10] A systematic review confirmed that factors like the number of implants, their angulation, the scanning strategy, and the type of scanner all influence the accuracy of full-arch implant scans. [7]
Orthodontics and Clear Aligners
TRIOS scans are widely used to plan orthodontic treatment and fabricate clear aligners. The scanner captures the current position of every tooth. Software then simulates tooth movements and generates a series of aligner trays. TRIOS is compatible with several aligner systems, including ClearCorrect and other third-party platforms.
Monitoring and Other Uses
Beyond making restorations, digital scans can track changes over time. A feasibility study used intraoral 3D scans to monitor erosive tooth wear (gradual loss of enamel from acid exposure). Researchers found the scanner could detect and quantify small surface changes between appointments. [8] Another study explored whether intraoral scan data could help detect dental plaque, finding moderate agreement between scanner-based assessments and traditional clinical plaque scoring. [6] These applications are still being developed but show the expanding role of scanner technology.
Accuracy, FDA Status, and Research Evidence
TRIOS is FDA-cleared as a Class II medical device through the 510(k) pathway. This means the FDA found it substantially equivalent to an existing legally marketed device. FDA clearance is different from FDA approval, which involves a more rigorous premarket review typically required for higher-risk devices.
What the Research Shows About Accuracy
A 2021 study compared the accuracy of ten commercially available intraoral scanners, including TRIOS 3, by scanning a reference model and measuring deviations. TRIOS 3 was among the scanners that demonstrated high trueness and precision for partial-arch scans. [9] However, the study also showed that accuracy varied between brands and that no single scanner outperformed all others in every scenario.
A 2021 systematic review by Mangano et al., which analyzed in vitro studies comparing digital and conventional impression methods, concluded that for single crowns and short-span fixed dental prostheses, digital impressions appear to be as accurate as conventional impressions. For long-span prostheses and full-arch rehabilitations, conventional impressions may still be more accurate than digital methods. [2]
A 2024 in vitro study highlighted that regular calibration of intraoral scanners significantly affects their accuracy. Scanners tested before calibration showed higher deviation from the reference model compared to scanners tested after calibration. [3] This finding underscores that how well the equipment is maintained matters as much as the brand of scanner.
Evidence in Specialized Populations
Researchers have also tested intraoral scanners in less common clinical settings. A 2024 study by Chatborirak et al. evaluated the accuracy and trueness of intraoral scanners used on neonates with cleft lip and palate. The study found that digital scans produced clinically acceptable 3D models, suggesting potential applications in pediatric craniofacial care. [4] While this study did not use TRIOS specifically, it reflects the broader trend of intraoral scanning technology expanding into specialized fields.
Professional Society Perspectives
The American College of Prosthodontists recognizes digital impressions as an accepted tool in prosthetic dentistry. [11] The American Dental Association provides patient education resources that include digital impressions as a modern alternative to traditional molds. [12] Neither organization endorses a specific scanner brand, but both acknowledge the clinical role of digital impression technology.
Benefits and Limitations of TRIOS vs. Traditional Impressions
Digital scanning offers clear advantages in comfort and workflow, but it is not the best choice for every clinical situation. A fair comparison requires looking at both sides.
Advantages of Digital Scanning
Patient comfort is the most obvious benefit. There is no putty, no gagging, and no waiting for material to set. Patients with a strong gag reflex or dental anxiety often tolerate the wand much better than a loaded impression tray.
Speed and efficiency also improve. The scan file is sent electronically, so there is no risk of a physical impression being damaged or distorted in transit. If a scan is incomplete, the provider can add to it immediately rather than repeating the entire impression. Digital files can be stored indefinitely and retrieved for future treatment planning.
The built-in shade matching feature of TRIOS may improve color accuracy for restorations. A 2023 systematic review of 20 studies found that digital shade tools show strong consistency with instrumental shade measurement, potentially reducing the subjective variability of visual shade selection. [5]
- No putty trays or impression material in the mouth
- Scan completed in roughly two to five minutes per arch
- Instant re-scan of missed areas without starting over
- Electronic file transfer eliminates shipping delays and physical distortion
- Integrated shade measurement for more consistent restoration color
Limitations and Considerations
Full-arch accuracy remains a challenge for all intraoral scanners. When scanning an entire arch, especially one with multiple implants, small errors can accumulate across the span. A systematic review identified the number and angulation of implants, the scanning protocol, and the specific scanner used as key factors affecting full-arch accuracy. [7] In some full-arch implant cases, a conventional impression or a verification method may still be preferred.
Scanner calibration and maintenance matter. A 2024 in vitro study found measurable differences in accuracy between calibrated and uncalibrated scanners. [3] Patients have no easy way to check this, but asking your provider about their calibration schedule is reasonable.
Moisture, blood, and saliva can interfere with scanning. The provider needs a relatively dry field, which can be difficult in certain areas of the mouth. Subgingival margins (preparation edges below the gumline) can be harder to capture digitally than with certain impression materials that flow under the gum tissue.
Cost of the scanner itself is significant for the dental practice. TRIOS units typically range from $20,000 to $45,000 or more depending on the model and software package. This cost is absorbed into the practice's overhead and is not typically itemized on a patient bill.
- Accuracy may decrease across full-arch scans, especially with many implants
- Scanner requires regular calibration to maintain precision
- Moisture and blood can interfere with data capture
- Deep subgingival margins may be harder to capture digitally
- Not every dental office has invested in this technology
Cost and Insurance Coverage
In most cases, you will not see a separate line item on your bill for a digital scan. The cost of scanning is typically included in the overall fee for the restoration or treatment being planned. For example, the fee for a porcelain crown includes the impression step, whether digital or conventional.
Crown fees generally range from $800 to $3,000 per tooth. Implant-supported restorations may range from $3,000 to $6,000 or more per implant site. Clear aligner treatment typically costs between $3,000 and $8,000. All of these figures vary by location, provider, and case complexity.
Dental insurance plans do not distinguish between digital and conventional impressions in their coverage policies. If your plan covers a crown at a certain percentage, it covers that crown regardless of the impression method used. However, some plans cap annual benefits, so check your plan details for any restoration.
Not all dental offices own an intraoral scanner. Prosthodontists and orthodontists are more likely to have this technology than general dental practices, though adoption is growing across all practice types.
Questions to Ask Your Specialist About Digital Scanning
If you are considering a crown, bridge, implant, or aligner treatment, you may want to ask your provider about their impression method. Here are specific questions that can help you understand what to expect.
- Do you use an intraoral scanner for impressions? If so, which system? Experience with the specific scanner matters for accuracy.
- How often is the scanner calibrated? Regular calibration helps maintain accuracy. [3]
- For my specific case, is a digital scan the best option? In some full-arch or complex implant cases, a conventional impression or a combination approach may still be recommended. [7]
- Will the scan be sent to an outside lab or used with an in-office milling machine? This affects turnaround time for your restoration.
- Is there any additional cost for a digital scan versus a traditional impression? Typically not, but it is worth confirming.
- Can I see the scan on screen? One advantage of digital impressions is that you can view the 3D model of your own teeth and understand the treatment plan visually.
Find a Prosthodontist Near You
If you need a crown, bridge, implant, or other restoration and want a provider who uses current digital impression technology, search our directory to find a qualified prosthodontist in your area. You can filter by location and specialty to connect with a provider who fits your needs.
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