Author explains an orthodontic appliance which permits uprighting of horizontal impacted mandibular second molar teeth, associating a mandibular anchorage and an uprighting auxiliary spring. The anchorage consist in a Mollin lower lingual arch. The auxiliary spring will upright the tooth in two steps. First one, it will induce a distal movement of the second molar. Second one it will induce the crown tipping. The significant benefit of this appliance is to permit an only orthodontic approach, without necessity of any surgical assistance.
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