Wear resistance of four types of vacuum-formed retainer materials: a laboratory study.

Objective: To investigate the resistance to wear of four different vacuum-formed retainer (VFR) materials: Essix C+, Essix ACE, Duran, and Tru-Tain. Essix C+ is a polypropylene polymer; the other materials are polyethylene co-polymers.

Materials And Methods: The study was undertaken at the Leeds Dental Institute, Leeds, UK, with 26 samples in each group.