The purpose of this article is to present the tip-back mechanics. This appliance allows leveling of the curve of Spee by extrusion and rotation of premolars and molars as well as correcting their axial inclination. This is usually associated with a non-extraction approach to treatment in an effort to gain additional arch length. This segmented approach therefor allows avoiding extraction of premolars in several cases.
(Rev Esp Ortod. 2016;46(2):053-057)