ORTHO-AMSTERDAM 2026
10 International Keynote Speakers
Thursday 24 June – Friday 25 June 2026 – Heineken Experience – Amsterdam
Curriculum Vitae – Hans Booij
Hans Booij was born March 19, 1954, in Groningen, the Netherlands. After graduating from the ‘Heymans lyceum’ in 1971, he started studying dentistry at the University of Utrecht and was active in the dental students association ‘John Tomes’. He graduated in 1977 and became a dental officer in the Royal Dutch Navy for a period of almost two years. From 1979 to 1983 he took the postgraduate course at the Department of Orthodontics of the University of Utrecht. In that period this department was under the leadership of Dolf Hoeksema, who taught him the enthusiasm and love for orthodontics. Before starting his orthodontic practice in the province town of Gorinchem, just south of Utrecht, he made an orthodontic study tour in the USA. There he met, among others, Raleigh Williams, who introduced the treatment method for Class II malocclusions after upper first permanent molar extractions. Inspired by the good long-term treatment results of this method, the enthusiasm arose to do research into it. With the indispensable and inspiring support of Anne Marie Kuijpers-Jagtman and Christos Katsaros, the framework for this dissertation was designed. The realization took quite some time, partly because the long term results were also investigated. He defended his PhD thesis on 10 March 2021.
From 1985 to 2000 he has been the Honorary Secretary of “de Nederlandse Vereniging voor Orthodontische Studie” and in 1997 he was the President of the European Begg Society and organized an international congress in Maastricht. Since 2002 to present he is the Honorary Secretary of the Booy Foundation. In 2005 he became an active member of the Angle Society Europe.
He married Marina Rose den Uijl and they got three children: Coen, Lex and Laurine. Since its foundation, he has been chairman of the IKTFC cooking club and in 1997 he won the title of best amateur chef in the Netherlands.
Abstract
Lecture: Maxillary first versus second permanent molar extractions in Class II/1 patients
Class II division 1 malocclusion is the most frequent orthodontic anomaly treated. The orthodontist can choose between a wide range of treatment methods based on jaw orthopedics and/or dento- alveolar compensation. Alternatives offered in the literature, are the use of miniscrew implants and sub-mucosal bone anchored miniplates.
The dento-alveolar compensation with extraction of maxillary first permanent molars can be very effective. It facilitates the rearrangement of the dentition and the occlusion incorporating the natural tendency for mesial drift of the maxillary second molars and the distal drift of the premolars.
Advantages of Class II treatment using maxillary second permanent molar extractions are shorter treatment time and easy distalisation of the first molars through the extraction site.
Which differences in indication and in treatment outcome can be found between patient groups treated after these different extractions?
