tresD DICOM viewer opens DICOM and DICOMDIR files and intraoral scans, and in seconds you can move through the MPR slices and see the 3D render, the panoramic, the TMJ, the airway and the superimposition of two studies. Research and teaching software.
Open tresD DICOM viewerYour files are never uploaded: everything is processed on your own computer.
Created by Dr Manuel Fernández Cano, orthodontist
Builds a 3D soft-tissue file from a single photo
Soft tissue and bone, each with its own transparency.
automatically, with no thresholds to fiddle with.
STL, PLY or OBJ placed automatically on the bone.
Volume, minimum area and a heat map by cross-section.
In a few seconds: open the case, the 3 MPR slices, the 3D, the cephalograms and the panoramic.
Get everything out of the CBCT
Load the initial and the final CBCT and tresD DICOM viewer superimposes them automatically, with no landmarks. A colour map shows how much each area moved and in which direction.
A panoramic taken from the CBCT itself, with a hand-editable arch curve and the thickness you choose, up to the condyles.
A dedicated view with the sagittal and coronal slices of the cervical vertebrae, located automatically behind the airway. The wheel scrolls through the slices and the middle button adjusts the CBCT area.
A high-resolution coronal slice through the first molars. Rotate and move it from the axial thumbnail, and use the wheel to move it forwards or backwards.
A slice parallel to the ANS-PNS plane, found automatically, halfway through the palate thickness. Rotate it from the sagittal thumbnail and adjust the height with a slider.
From the same CBCT you get the 2D lateral and frontal cephalograms, projected with parallel rays at 1:1 scale, in MIP or radiograph mode. No extra radiation to obtain the cephalogram.
One click on each condyle and you get the sagittal, coronal and axial slices perpendicular to its axis, 1 mm apart, scrollable and with distance and angle measurements.
Screenshots, measurements and notes go into a PDF or PowerPoint report. And the whole case is saved in one file so you can reopen it exactly as you left it.
Each feature, step by step: Panoramic · Airway · TMJ · Superimposition · Cephalogram · Intraoral scan · DICOM to STL · Suture, transverse and vertebrae · iPad and phone · All
17 short step-by-step videos to get the most out of it, from the first CBCT to the report. The videos are in Spanish: turn on YouTube subtitles and auto-translate them.
From the makers of tresD DICOM
Do you also work with intraoral scans?
Try tresD Models, our free orthodontic models program, also in the browser with nothing to install: realistic colour on your STLs, scan editing, measurements, virtual model bases ready to print and T0 – T1 superimposition.
Try tresD Models for free
At our in-person courses, every attendee works with tresD DICOM on their own computer or tablet, in the browser.
Upcoming in-person tresD courses. Each course is taught in its own language.
Orthodontist · Clínica Áncora, Málaga (Spain)
tresD DICOM viewer has been developed by Dr Manuel Fernández Cano, an orthodontist at Clínica Áncora in Málaga, Spain, as part of tresD Ortodoncia Digital, the same brand behind tresD Models. Each version takes in the ratings, comments and anonymous error reports of the people who use it.
4.95 / 5 · average rating from 223 users
In my day-to-day practice I look for tools that add precision and simplicity. What tends to be tedious in other programs works very intuitively here: superimposing DICOM and STL is straightforward, and outlining and measuring the airway takes a couple of clicks. Being able to take free measurements and angles in such a visual 3D environment gives you an immediate, simple overall view of the case. And above all, it works with my operating system, so I can keep a digital workflow and review cases outside the practice with complete ease (one of the biggest advantages I find).
All in all, a fast and very practical diagnostic tool. If they keep up this pace with the coming updates it will be «a must» in my planning protocol.
Paola Laguarda · Gran Canaria (Spain)
I love the software because it lets me look at CBCT scans on any device without downloading those huge files. And every day I find new tools that make diagnosis quicker and more effective.
Ana María Martínez · Quito (Ecuador)
It is a very complete software that makes reading and interpreting CT scans easier, allowing detailed analysis of anatomical structures. Its interface is intuitive and easy to use, and since it is an online platform, all you need to access its tools is an internet connection.
Natalia López · Bogotá (Colombia)
Anonymous, sent together with the rating from the program or this page.
★★★★★“Excellent software: user-friendly, fast and with everything you could need. Congratulations, Dr. Manuel.” (translated)
03-11-2026
★★★★★“Perfect viewer. Very easy to use. At the same time, very complete.” (translated)
03-11-2026
★★★★★“Very complete, intuitive and with an incredible level of detail. A real contribution to the profession!!” (translated)
03-11-2026
★★★★★“It is an excellent tool, 100% recommended.” (translated)
30-10-2026
★★★★★“An online viewer as complete as the best one you could have installed taking up space on your PC, or even more so.” (translated)
29-10-2026
★★★★☆“I think you could add this: when a point is selected, all the views could go to that point, to look at it in every plane.” (translated)
29-10-2026
Directories and websites that feature tresD DICOM.
With the DICOM files your machine exports: loose, in a folder, with a DICOMDIR, or inside a ZIP or RAR. And with intraoral scans in STL, PLY and OBJ.
Step-by-step guides: Carestream · Planmeca · Morita · Vatech · NewTom · Sirona · i-CAT · Acteon · KaVo · Gendex · Soredex · Owandy · a CT scan CD · opening a CBCT on a Mac
Tested with files from these machines. The names belong to their owners and only indicate file compatibility: there is no affiliation or sponsorship.
A free CBCT and DICOM viewer that runs in the browser with nothing to install: slices, 3D render, panoramic, airway, TMJ, superimposition of two CBCTs, intraoral scans and a PDF report. It was developed by Dr Manuel Fernández Cano, an orthodontist, for visualisation and teaching.
Because «tres» is Spanish for «three»: «tresD» means «3D», and it is a 3D DICOM viewer. When you search for it on Google or ask an AI assistant, type «tresD DICOM» (tresD as one word) or go straight to tresddicom.com. It is not related to other programs with similar names.
Yes. No account, no 15-day trial, no hidden paid tier.
No. The browser reads the files straight from your disk and all the computation happens on your computer. No server receives images or photos, so there is nothing to delete afterwards.
There is nothing to install: it works in Chrome, Edge, Safari and Firefox, on Windows, Mac and Linux. On iPad, iPhone and Android the CBCT is opened from a ZIP: this is how.
DICOM with or without the .dcm extension, DICOMDIR, multiframe and compressed (JPEG, lossless JPEG, JPEG 2000, JPEG-LS, RLE), loose, in a folder or inside a ZIP or RAR. Also intraoral scans in STL, PLY and OBJ and photos in JPG or PNG.
View the slices and the 3D render, measure, get the panoramic and the cephalogram, segment the airway, look at the TMJ, superimpose two CBCTs, place the intraoral scans, download the bone as STL and make a PDF report. Measurements are indicative. All features.
No. tresD DICOM is a visualisation and teaching tool: it is not a CE-marked medical device. Measurements and alignments are indicative and the professional's judgement always comes first.
If it exports standard DICOM, yes, whatever the brand. It reads folders, DICOMDIR, ZIP and RAR, and repairs series with slices out of place. If yours gives trouble, write to us and we will look into it.
A few seconds before you see slices: they appear while it loads. A large 800-slice study takes a bit longer to have the full 3D.
Yes. The whole case is saved in a .tresd file and reopens exactly as you left it. And with .tresdz you can pass it to a colleague with the CBCT inside.
Yes: 17 short step-by-step tutorials (in Spanish) in the «Video tutorials» section of this page and in the viewer's Help (? button), where each topic has its video.
If the CBCT needs more graphics memory than is available, the viewer offers light mode (half the graphics memory): accept it first. If it fails again, it is usually the graphics card driver after a Windows or browser update. Turn off graphics acceleration: in Chrome, Settings → System → «Use graphics acceleration when available»; in Edge, Settings → System and performance → «Use graphics acceleration when available»; in Firefox, Settings → General → Performance. Restart the browser and open the case again. The 3D render will be slower (it moves in light mode and sharpens when you let go), but everything works.
In Spanish, English, Brazilian Portuguese and Russian: the viewer, the legal texts, the report and this website. Change the language with the flag at the top.
Dr Manuel Fernández Cano, an orthodontist at Clínica Áncora in Málaga (Spain) and collaborating lecturer on the UCAM Master’s in Orthodontics. His page.
There is no server receiving the DICOM files or the photos: the browser reads them straight from disk and all the computation happens on your machine. That is why it works just as well with no internet at all, and why there is no sign-up.
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The program updates itself: just reload the page.
Tell me what is missing or what does not work for you: almost everything in the program came from a suggestion.
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Drag in the CBCT folder and that is it.
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