1 and San Mater arch 3 and 5 are one of the different arch types of orthodontic wires. According to the shape and bending degree of orthodontic wires, different arch types are suitable for different tooth movement needs.

2. Orthodontic wires can also be divided into upper tooth type (U) and lower tooth type (L) according to the use position. St. Matt's arches 3 and 5 can be used for orthodontic treatment of maxilla or mandible.