Unilateral. A band/crown loop is attached to one side of the mouth usually only replacing one tooth. It guides the permanent tooth to erupt in the right position. A distal shoe also holds space for a posterior tooth but is used when there is no tooth behind the one removed.
Bilateral. Two types can be used: one for the lower arch called a “lower lingual holding arch” and one for the upper arch called a “nance” or a “transpalatal arch”. They are used when more than one tooth is missing or on a patient with a mixed dentition.
Pedi Partial. Anterior space maintainer used when maxillary or mandibular teeth are extracted. Consists of a combination of an arch wire and resin replacement teeth. It can also be removable.