Intermolar Mandibular Distraction Osteogenesis-A Preliminary Report

Suen A. N. Lie*, Britt H. B. T. Engelen, Veronique C. M. L. Timmer, Nico M. P. Vrijens, Paolo Asperio, Peter A. W. H. Kessler

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Background: Dental Class II is the most common indication for combined orthodontic-orthognathic treatment. Intermolar mandibular distraction osteogenesis (IMDO) treatment was performed during the growth spurt, to avoid surgery at a later age. The aim of this study is to present our first experience with IMDO. Methods: This is a retrospective case series of patients who underwent an IMDO. All patients showed mandibular retrognathism, and orthodontic treatment with functional appliances was not successful. Results: In total, 20 patients (mean age of 14.8 years (SD = 0.9 ys) were included. All patients achieved a Class I occlusion. An average length gain of 9.6 mm (SD = 3.7 mm) was reached. In one patient an abscess occurred. Nine patients presented with root fractures of the second molar; three were lost, one treated endodontically. The average time between insertion and removal of the distractors was 4.6 months (SD = 1.5 mths). In one case a premature consolidation was seen. Conclusion: We achieved satisfactory results with IMDO, although undesirable effects occurred. An advantage is the manageable overall treatment time. Open questions concern the occurrence of root fractures. Furthermore, the question of long-term stability is open. The question of dynamic distraction treatment in relation to temporomandibular joint changes can only be answered in the long term.

Original languageEnglish
Article number4118
Number of pages12
JournalApplied sciences-Basel
Issue number9
Publication statusPublished - May 2021


  • distraction osteogenesis
  • osteotomy
  • orthognathic surgery
  • mandibular retrognathism
  • class II jaw relation

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