title: Reply.
authors.affiliation: Clinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine, University of Zurich, Switzerland.|Department of Oral Technology, School of Dentistry, University of Bonn.
authors.forename: Spyridon N
authors.initials: SN
authors.lastname: Papageorgiou
authors.affiliation: Department of Orthodontics, School of Dentistry, University Medical Centre Regensburg and.
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Koretsi
authors.affiliation: Department of Orthodontics, School of Dentistry, University of Bonn, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Jäger