Table 1. Materials used by different brands of clear aligners.

Source: Ref. [6]

Product name	Components
Bioplast (Scheu-Dental, GmbH, Iserlohn, Germany)	Ethylene-vinyl acetate copolymer
Copyplast (Scheu-Dental, GmbH)	Polyethylene
Duran (Scheu-Dental, GmbH)	Polyethylene terephthalate glycol
Hardcast (Scheu-Dental, GmbH)	Polypropylene
Imprelon S (Scheu-Dental, GmbH)	Polycarbonate
Essix A+ (Dentsply Raintree Essix, Inc.)	Copolyester
Essix G+ (Dentsply Raintree Essix, Inc.)	Polypropylene/ethylene copolymer (>95%)
Invisalign (Align Technology, San Jose, CA)	Polyurethane from methylene diphenyl diisocyanate and 1,6-hexanediol