Inside the Sentinel lab
Updated September 21, 2026
“3D printed night guard” sounds simple, but it can describe two very different things: a guard printed directly from resin, or a guard made over a 3D-printed model of your teeth. At Sentinel, we use the second approach—digital production where it helps, followed by hands-on finishing where it matters.
Quick answer
Sentinel does not currently make fully resin-printed night guards. We use 3D printing to create an accurate model of your teeth, then thermoform your chosen guard material over that model. Each guard is trimmed, smoothed, and fit-checked by hand before it leaves our Florida lab.
What does “3D printed night guard” actually mean?
The phrase is used broadly online, which can make it difficult to know what you are buying. A lab may use 3D printing in one part of the process—or it may print the final appliance itself.
Fully 3D-printed guard
The finished guard is printed directly, usually from a dental resin, then cleaned and cured. Some laboratories use this approach.
3D-printed model with a thermoformed guard
A digital model of the teeth is printed, then a guard is formed over that model using the selected guard material. This is Sentinel’s current process.
Neither label alone tells you whether a guard is right for you. The more useful question is how the appliance is made, finished, and checked before you wear it.
How Sentinel uses 3D printing
Once Sentinel receives an accepted at-home impression or qualifying digital scan, our lab prepares a working model of your teeth. We 3D print that model and use it as the foundation for fabrication.
Your night guard is then thermoformed over the model in your selected material. After forming, it is cut, shaped, smoothed, and checked by hand. That hands-on step lets our technicians see how the guard seats on the model and refine the edges before shipping.
Why we use a hybrid process
Digital tools are excellent for creating a consistent working model. But a night guard is still a physical appliance that needs clean edges, comfortable contours, and careful finishing. For Sentinel, printing the model and hand-finishing the guard gives us more control over the final appliance than direct resin printing alone.
Does 3D printing automatically mean a better night guard?
No. 3D printing is a production method, not a blanket promise of comfort, durability, or fit. A guard still depends on accurate dental anatomy, appropriate material selection, and thoughtful finishing.
A digital workflow can be useful, but it does not eliminate the need for a complete impression or current scan. If your teeth or dental work have changed, the model needs to reflect those changes. A beautiful digital file based on outdated anatomy is still outdated.
What this means for your order
You do not need to understand dental software to order a custom night guard from Sentinel. Most customers use our at-home impression kit. If your dentist or orthodontist has already provided a current digital scan, Sentinel also accepts qualifying .STL and .PLY files.
Those are two ways to provide your dental anatomy to the lab. The scan-upload article explains how to submit an existing file; this article is simply about what happens on the production side once the lab has what it needs.
What stays the same, no matter how the model begins
- Your guard is made for one arch of your own teeth.
- You choose the material and thickness that best suit your grinding habits and comfort preferences.
- The final guard is trimmed and smoothed in Sentinel’s Florida lab.
- The goal is a protective barrier between your upper and lower teeth during grinding or clenching.
Explore our custom night guard options to compare the Comfort, Hard, Hybrid, and Durability Guard designs.
What this article does not cover
To keep this guide useful and precise, it does not walk through choosing a scanner, uploading a file, comparing digital scans with impressions, or claiming that one manufacturing method is universally better than another. Those are separate questions with their own guides.
If you are deciding whether a custom guard is right for you generally, start with What Is a Custom Night Guard? If you already have a scan and want to use it, read How to Send a Digital Scan for a Night Guard.
Digital where it helps. Hands-on where it counts.
Sentinel combines 3D-printed dental models with careful, in-house finishing to make custom guards for real teeth—not generic shapes.
Explore custom night guardsFrequently asked questions
Does Sentinel make fully 3D-printed resin night guards?
No. Sentinel currently 3D prints the model of your teeth, then thermoforms the night guard over that model and finishes it by hand.
Are 3D-printed models used for every Sentinel guard?
Our digital workflow is used to prepare a working model from accepted impressions or qualifying digital scans. The finished guard is then formed and hand-finished in our lab.
Can I send a digital dental scan instead of taking an impression?
Yes, Sentinel accepts qualifying current .STL and .PLY files. Visit our digital-scan guide for file requirements and ordering steps.
Will a digital scan make my guard fit perfectly?
No manufacturing method can promise a perfect outcome for every mouth. A scan must accurately reflect your current teeth and dental work, and the final appliance still needs appropriate material selection and careful finishing.
Does 3D printing change which guard material I can choose?
No. You can still choose among Sentinel’s custom guard materials and thicknesses based on your grinding habits and comfort preferences.
Dental note
This article explains Sentinel’s current lab process and is for general education. A night guard is a protective appliance, not a replacement for dental diagnosis or treatment. See your dentist for new pain, loose teeth or restorations, bite changes, or active dental work.