STL, EXOCAD, 3Shape: What File Formats Should Your Dental Lab Support?

In digital dentistry, file compatibility issues still cause unnecessary delays, remakes, and communication problems. A case may begin with a 3Shape TRIOS scan, move into exocad for design, and then be sent to another lab for production - only for problems to appear when the files are opened, color data is missing, or margin details do not transfer cleanly.

This article looks at the real-world role of STL, PLY, OBJ, and the file types commonly involved in 3Shape and exocad workflows. The goal is to clarify which formats matter most, where compatibility problems still happen, and what to look for when choosing a long-term outsourcing partner.

STL – The Universal Standard Every Dental Lab Must Support

STL (Standard Tessellation Language) remains the baseline format in digital dentistry. It stores only surface geometry as a mesh of triangles. No color, no texture, no material information - just the shape.

Most intraoral scanners export STL by default. Nearly every CAD software, including exocad and 3Shape, and almost all milling machines and 3D printers accept it without issues. For everyday crown, bridge, and implant cases, STL is still the safest and most efficient choice for production.

Its biggest advantage is universal compatibility and small file size. Its main limitation is obvious: it carries no color data. Soft tissue margins, shade information, and aesthetic references are lost. In many routine posterior restorations this doesn't matter much. In anterior or high-aesthetic cases, it becomes a real constraint.

From our production floor, any professional dental lab that claims to be digital must support STL at the highest quality level. If a lab struggles with clean STL files, you will face problems later.

PLY and OBJ – When Color and Texture Actually Matter

When color information becomes important, labs need to move beyond STL.

PLY (Polygon File Format) and OBJ both store geometry plus color and texture data. PLY has become particularly popular in dental because exocad handles it well for importing intraoral scans. Newer intraoral scanners now offer PLY and OBJ exports as standard options.

These formats shine in cases where the technician needs to see gingival contours, shade transitions, or soft tissue details clearly during design. Full-arch aesthetic restorations and complex implant cases often benefit from them.

However, support is not as universal as STL. Some CAD systems require additional plug-ins to read PLY or OBJ properly, and file sizes are noticeably larger. Not every milling machine or printer needs the color data, so many workflows still convert back to STL for final manufacturing.

In practice, we recommend sending PLY when the case involves high aesthetics or when the dentist specifically wants the lab to reference color information. For standard restorations, a good STL file is usually enough.

3Shape Formats: DCM, STL, and PLY from TRIOS Workflows

3Shape users, especially those working with TRIOS scanners and Dental System, typically generate two main types of files: DCM and STL.

DCM is 3Shape's proprietary format. It preserves high detail and rich color information, which is excellent when staying entirely inside the 3Shape ecosystem. The downside is its closed nature. Many external labs, including those running exocad, cannot open DCM files directly.

That is why 3Shape allows exporting to STL and, on newer systems, to PLY. From our experience, the exported STL quality depends heavily on the export settings chosen in Dental Manager. Poor settings lead to heavy meshes or loss of fine detail.

If you are sending cases from 3Shape to an external lab, always verify that the lab can handle both clean STL files and, when needed, PLY for color-critical work.

exocad and Open File Formats

exocad takes a different approach. Built as an open system, it works natively with STL and handles PLY and OBJ very well. This open architecture makes exocad especially popular among labs offering outsourcing services and among dentists who want flexibility across different scanners and production partners.

Because exocad is less locked into one hardware brand, it gives both the clinic and the lab more freedom. Technicians can receive STL or PLY files from various scanners - TRIOS, Medit, iTero, and others - and start designing with minimal conversion steps.

This openness is exactly why many overseas clinics prefer working with labs that have strong exocad capabilities. Fewer file conversions usually mean better accuracy and faster turnaround.

Compatibility Between 3Shape and exocad – What Actually Happens in Real Cases

Here is the reality most users discover:

• STL files exported from 3Shape can be imported into exocad in most cases.
• Color information is usually lost unless PLY or OBJ is used.
• Some fine detail can degrade during conversion if export settings are not optimized.
• Certain complex implant libraries or dynamic occlusion data transfer more smoothly when staying closer to native formats.

From years of processing mixed cases, the cleanest results come when the lab supports both ecosystems without forcing heavy conversions. A lab that insists on only one software or format creates unnecessary friction for international clients.

Quick Comparison Table:

What File Formats Should Your Dental Lab Support?

After handling thousands of overseas cases, our clear recommendation is:

• STL – Non-negotiable. Every capable digital dental lab must support high-quality STL import and processing without excuses.
• PLY and OBJ – Strongly recommended. Modern workflows increasingly include color data, and exocad users especially benefit from it.
• Ability to handle files coming from both 3Shape and exocad environments.

A lab that only accepts one format or one software ecosystem limits your options and increases risk. The best outsourcing partners adapt to your current equipment and software rather than forcing you to change your workflow.

At ADS Dental Laboratory Ltd, we have built our digital workflow around exactly this principle. We fully support STL as the production backbone, routinely work with PLY and OBJ for aesthetic and complex cases, and maintain strong compatibility with both 3Shape and exocad projects. This flexibility allows us to serve clinics and labs using different scanners and design software without constant back-and-forth.

Practical Guide: How to Send Digital Cases Successfully

To avoid common headaches when outsourcing:

1. For standard restorations - export and send STL.
2. For anterior aesthetics or cases where shade and tissue details matter - send PLY whenever possible.
3. Check export settings in 3Shape carefully. Higher resolution settings improve quality but increase file size.
4. Always include basic case information (tooth numbers, material preference, special instructions) together with the files.
5. Name files clearly so our team can match them quickly.

Following these simple steps dramatically reduces communication rounds and speeds up production.

In daily practice, the combination of a clean STL file plus optional PLY for reference has proven to be the most reliable approach for long-term outsourcing.

Ready to Work with a Lab That Actually Speaks Your File Language?

File format compatibility might seem like a technical detail, but it directly affects fit, aesthetics, turnaround time, and how smoothly your overseas partnership runs.

If you are looking for a stable, long-term digital dental laboratory in China that truly understands STL, PLY, exocad, and 3Shape workflows, we are ready to help.

Send us a test case - STL or PLY format is perfect. Our team will review it and return feedback quickly so you can evaluate the quality yourself.

Contact ADS Dental Laboratory Ltd today. Let's discuss how we can support your growing digital cases with reliable file handling and consistent production quality.