caa a22 4500 445347694 CHVBK 20180317142834.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00056-011-0025-4 doi (NATIONALLICENCE)springer-10.1007/s00056-011-0025-4 Overjet correction and space closure mechanisms for ClassII treatment by extracting the maxillary first molars [Elektronische Daten] [J.W. Booij, J. Goeke, E.M. Bronkhorst, H. Pancherz, S. Ruf, C. Katsaros] Mechanismus der Overjet-Korrektur und des Lückenschlusses bei der Klasse-II-Behandlung mittels Extraktion der ersten Oberkiefermolaren Objective: To analyze the mechanism of overjet correction and space closure when treating ClassII Division1 patients by extracting the maxillary first molars. Patients and methods: A total of 100prospective, consecutively treated ClassII Division1 patients (45female, 55male; 10.5-17.2years old). Standardized lateral cephalograms prior to and after treatment were evaluated via a modified sagittal occlusion analysis (SO analysis). Results: The mean degree of overjet correction was 5.2mm (95%CI=4.8-5.6mm) and was on average achieved by means of 1.7mm skeletal and 3.5mm dental changes. The relationship between the premolars improved by 4.8mm toward a ClassI relationship, facilitated by 1.7mm skeletal and 3.1mm dental changes. The 11.3mm space closure in the maxillary first-molar extraction area resulted from distalization of the second premolars (1.4mm) and a mesialization of the second molars (9.9mm). Conclusions: Overjet correction was essentially achieved by a retrusion of the upper incisors, as well as by ventral growth of the lower jaw and protrusion of the lower incisors. Space closure was only partly achieved by distalization of the premolars. Urban &amp; Vogel, Muenchen, 2011 Class II treatment nationallicence Maxillary molar extraction nationallicence Treatment effects nationallicence Klasse-II-Behandlung nationallicence Oberkiefermolarenextraktion nationallicence Behandlungseffekte nationallicence Booij J.W. Department of Orthodontics and Oral Biology, Radboud University Nijmegen, Medical Center, Nijmegen, The Netherlands aut Goeke J. Private Practice, Hamburg, Germany aut Bronkhorst E.M. Department of Preventive and Curative Dentistry, Radboud University Nijmegen, Medical Center, Nijmegen, The Netherlands aut Pancherz H. Poliklinik für Kieferorthopädie, Zentrum für Zahn-, Mund- und Kieferheilkunde, Justus-Liebig-Universität Gießen, Schlangenzahl 14, 35392, Gießen, Deutschland aut Ruf S. Poliklinik für Kieferorthopädie, Zentrum für Zahn-, Mund- und Kieferheilkunde, Justus-Liebig-Universität Gießen, Schlangenzahl 14, 35392, Gießen, Deutschland aut Katsaros C. Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Bern, Switzerland aut Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Springer-Verlag 72/3(2011-07-01), 196-203 1434-5293 72:3<196 2011 72 56 https://doi.org/10.1007/s00056-011-0025-4 text/html Onlinezugriff via DOI 1 article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00056-011-0025-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Booij J.W. Department of Orthodontics and Oral Biology, Radboud University Nijmegen, Medical Center, Nijmegen, The Netherlands aut NATIONALLICENCE 700 1- Goeke J. Private Practice, Hamburg, Germany aut NATIONALLICENCE 700 1- Bronkhorst E.M. Department of Preventive and Curative Dentistry, Radboud University Nijmegen, Medical Center, Nijmegen, The Netherlands aut NATIONALLICENCE 700 1- Pancherz H. Poliklinik für Kieferorthopädie, Zentrum für Zahn-, Mund- und Kieferheilkunde, Justus-Liebig-Universität Gießen, Schlangenzahl 14, 35392, Gießen, Deutschland aut NATIONALLICENCE 700 1- Ruf S. Poliklinik für Kieferorthopädie, Zentrum für Zahn-, Mund- und Kieferheilkunde, Justus-Liebig-Universität Gießen, Schlangenzahl 14, 35392, Gießen, Deutschland aut NATIONALLICENCE 700 1- Katsaros C. Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Bern, Switzerland aut NATIONALLICENCE 773 0- Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Springer-Verlag 72/3(2011-07-01), 196-203 1434-5293 72:3<196 2011 72 56 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer