Table 2.

Overview of retainer materials used in the biomechanical bending test

Material	Manufacturing process	Dimension	Manufacturer	Sample size (n)
Twisted steel	Conventional	Round, 0.44 mm	Dentaurum, Ispringen, Germany	Maxillary arch: 8 Mandibular arch: 8
NiTi, cut	Cut and laser polished	Rectangular, 0.35 × 0.35 mm	CA Digital, Hilden, Germany	Maxillary arch: 10 Mandibular arch: 10
Titanium, cut	Cut	Rectangular, 0.60 × 0.50 mm	Teeth & Tech, Wiesbaden, Germany	Maxillary arch: 10 Mandibular arch: 10
Titanium, printed	Printed	Rectangular, 1.00 × 0.50 mm	Medical Additive Manufacturing Laboratory, FH Nordwestschweiz, Muttenz, Switzerland	Maxillary arch: 10 Mandibular arch: 10

NiTi, nickel-titanium.