title: Correction of severe tooth rotations using clear aligners: a case report.
abstract: BACKGROUND
  The present adult patient case report shows the correction of a crossbite malocclusion and severe tooth rotations treated with the Invisalign system.
  
  
  METHODS
  A 27-year-old female with a dental crossbite (24, 34), severe rotations of two lower incisors (more than 40 degrees) and malalignment of the upper and lower arches is described. The Invisalign system was treatment planned to correct the malocclusion.
  
  
  RESULTS
  The treatment goals of crossbite, rotation and malalignment correction were achieved after 12 months of active aligner therapy. The overbite improved (2.5 mm before treatment, 1 mm at the end); the dental crossbite, the crowding and the severe tooth rotations (with a mean of 2 degrees of improvement per aligner) were corrected.
  
  
  CONCLUSIONS
  After treatment, the dental alignment was considered excellent. The presented case indicates that the Invisalign system can be a useful appliance to correct a dental malocclusion involving severe rotations.
authors.affiliation: gianluigi_frongia@msn.com
authors.forename: Gianluigi
authors.initials: G
authors.lastname: Frongia
authors.forename: Tommaso
authors.initials: T
authors.lastname: Castroflorio
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D002508:Cephalometry / Q000379:methods; D003724:Dental Arch / Q000473:pathology; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology; D008310:Malocclusion / Q000628:therapy*; D016382:Orthodontic Appliance Design; D057887:Overbite / Q000628:therapy; D012399:Rotation; D014087:Tooth Movement Techniques / Q000295:instrumentation*