{"data":{"id":"us/21-cfr-872.3660","jurisdiction":"us","citation":"21 CFR 872.3660","heading":"Impression material.","body":"(a) Identification. Impression material is a device composed of materials such as alginate or polysulfide intended to be placed on a preformed impression tray and used to reproduce the structure of a patient's teeth and gums. The device is intended to provide models for study and for production of restorative prosthetic devices, such as gold inlays and dentures.\n(b) Classification. Class II (Special Controls).","path":["Title 21—Food and Drugs","CHAPTER I—FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER H—MEDICAL DEVICES","PART 872—DENTAL DEVICES","Subpart D—Prosthetic Devices"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-21.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:47Z","sha256":"b0191d21aaeb9d5a4aefa006528f1a3de499cde40e01c1a8403a042175d93e65","source_id":"us-cfr","stale":true,"prev":"us/21-cfr-872.3645","next":"us/21-cfr-872.3661"},"notice":"GroundRules: Original legal text. Not legal advice."}