510(k) · Cleared
ClearedNightGuard Flex
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Sprintray, Inc. · MQC Mouthguard, Prescription
Cleared on Nov 12, 2021 as substantially equivalent to K183598 (Keystone Industries, 2019) after a 99-day review. Its family tree reaches back 1 generation to 2019. 2 later devices descend from it.
- Decided
- Nov 12, 2021
- Review
- 99 days
- Class
- Class U
- Product code
- MQC
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 1 generation to K183598 (2019). 2 later devices descend from it, 1 citing it directly.
- Root · 1 generation backK183598 KeyPrint KeySplint SoftKeystone Industries · 2019 · Recalled
- This deviceK212448 NightGuard FlexSprintray, Inc. · 2021
- Descendant · cites it directly · 1 of its ownK221022 NextDent Ortho FlexVertex-Dental B.V. · 2022
- Descendant · 2 generations on · 0 of its ownK251415 Additively Manufactured Aligner ResinAidite (Qinhuangdao) Technology Co., Ltd. · 2025
Most influential descendants
Showing 2 of 2 · See allView FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −1 | K183598 | KeyPrint KeySplint Soft | Keystone Industries | 2019 | 1 |
| 0 (this device) | K212448 | NightGuard Flex | Sprintray, Inc. | 2021 | — |
| +1 | K221022 | NextDent Ortho Flex | Vertex-Dental B.V. | 2022 | — |
| +2 | K251415 | Additively Manufactured Aligner Resin | Aidite (Qinhuangdao) Technology Co., Ltd. | 2025 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2022 | 1 | 0 |
| 2025 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in MQC? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new MQC device
- #1 K203000 KeyPrint KeySplint Hardscore 15.3 · 5 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (1)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K183598 | KeyPrint KeySplint SoftSummary page 5…ion Name: MouthGuard, Prescription Regulatory Class: Unclassified Product Code: MQC, KMY Predicate Device KeySprint’s KeySplint Soft (K183598) Reference Device EnvisonTech’s E-Guard (201173) Device Description The NightGuard Flex consists of a curable den… | 2019 |
| † | K201173 | E-Guard | 2020 |
What descends from it? (2)
1 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K221022 | NextDent Ortho Flex | 2022 | 1 |
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
How does its category compare?
All MQC devicesMQC Mouthguard, Prescription: FDA decisions, review times, recalls and adverse event reports over 20 years. 2021, this device’s year, is highlighted.
FDA decisions per year · MQC
4in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · MQC
185in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · MQC
1in 2023
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · MQC
7in 2025
MAUDE reports naming product code MQC, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 4 | 79 | 0 | 9 |
| 2008 | 0 | — | 0 | 6 |
| 2009 | 2 | — | 0 | 3 |
| 2010 | 1 | — | 0 | 5 |
| 2011 | 4 | 194 | 0 | 2 |
| 2012 | 2 | — | 0 | 0 |
| 2013 | 1 | — | 0 | 6 |
| 2014 | 1 | — | 0 | 2 |
| 2015 | 3 | 234 | 0 | 5 |
| 2016 | 0 | — | 0 | 9 |
| 2017 | 2 | — | 0 | 7 |
| 2018 | 0 | — | 0 | 71 |
| 2019 | 5 | 286 | 0 | 62 |
| 2020 | 4 | 204 | 0 | 46 |
| 2021 | 7 | 158 | 0 | 111 |
| 2022 | 5 | 120 | 0 | 137 |
| 2023 | 6 | 230 | 1 | 62 |
| 2024 | 8 | 249 | 0 | 8 |
| 2025 | 4 | 185 | 0 | 7 |
| 2026 | 2 | — | 0 | — |
What is it indicated for?
The SprintRay NightGuard Flex is indicated for the fabrication of orthodontic and dental appliances such as mouthguards, nightguards, splints and repositioners.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K212448 · printed Nov 6, 2026
Cite this page
510(k) Report. “K212448: NightGuard Flex.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K212448
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026