Tooth #19 (mandibular left first molar) is in lingual version. What is the most appropriate orthodontic management?

A tooth in lingual version (linguoversion) is displaced toward the tongue from its normal arch position. To correct linguoversion, adequate arch space must first be created — either by arch expansion, dental tipping, or extraction of adjacent teeth — because the tooth needs room to move buccally into proper arch alignment. A simple finger spring could move the tooth but only if space is already available. Without creating adequate arch space first, attempting to move the tooth would result in uncontrolled forces, poor anchorage, and potential relapse.