Published by on 22 de julho de 2026 Use pre-stress to avoid the risk of screw loosening and fracture. FDA for Handpiece: 510(K) Number: K181900, Regulation Number: 872.4200, Classification Product Code: EFB. FDA for Portable Dental Unit: 510(K) Number: K111907, Regulation Number: 872.6640, Product Code: EIA.