---
kind: "section"
citation: "21 C.F.R. § 872.3670"
title: "21"
number: "872.3670"
heading: "Resin impression tray material."
url: "https://uscodex.org/cfr/21/872.3670"
---

# §872.3670. Resin impression tray material.

- (a) **Identification.** Resin impression tray material is a device intended for use in a two-step dental mold fabricating process. The device consists of a resin material, such as methyl methacrylate, and is used to form a custom impression tray for use in cases in which a preformed impression tray is not suitable, such as the fabrication of crowns, bridges, or full dentures. A preliminary plaster or stone model of the patient's teeth and gums is made. The resin impression tray material is applied to this preliminary study model to form a custom tray. This tray is then filled with impression material and inserted into the patient's mouth to make an impression, from which a final, more precise, model of the patient's mouth is cast.
- (b) **Classification.** Class I (general controls). The device is exempt from the premarket notification procedures in [subpart E of part 807](/cfr/21/part807-subpartE.md) of this chapter subject to the limitations in [§ 872.9](/cfr/21/872.9.md). If the device is not labeled or otherwise represented as sterile, it is exempt from the current good manufacturing practice requirements of the quality management system regulation in [part 820](/cfr/21/part820.md) of this chapter, except for requirements concerning records and complaint files under [§ 820.35](/cfr/21/820.35.md) of this chapter.

## Notes

### Amendments

[52 FR 30097, Aug. 12, 1987, as amended at 59 FR 63008, Dec. 7, 1994; 66 FR 38798, July 25, 2001; 90 FR 55983, Dec. 4, 2025]

### Authority

Authority: 21 U.S.C. 351, 360, 360c, 360e, 360j, 360 l, 371.

### Source

Source: 52 FR 30097, Aug. 12, 1987, unless otherwise noted.

### Amendments

[52 FR 30097, Aug. 12, 1987, as amended at 59 FR 63008, Dec. 7, 1994; 66 FR 38798, July 25, 2001; 90 FR 55983, Dec. 4, 2025]