So uprighting of second molar is performed before aligning and levelling of arches.
Extraction of all first premolars (14,24,34,44) for correction of crowding and proclination and extraction of 38 for uprighting of 37.
To potentiate the tipping movement of the root in the mesial direction, a elastic chain is inserted between the second molar hook and the wire which is bent downwards from the mesial end of the uprighting spring (Figure 6).
In the literature there are many devices used for molar uprighting, however, with some deficiency in control from the mechanical point of view.
In the present article a special type of uprighting spring is used for molar uprighting.