Relapse and Stability of Surgically Assisted Rapid Maxillary Expansion: An Anatomic Biomechanical Study

Maarten Koudstaal, JBJ (Jan) Smeets, Gert-jan Kleinrensink, A Schulten, Karel Wal

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52 Citations (Scopus)


Purpose: This anatomic biomechanical study was undertaken to gain insight into the underlining mechanism of tipping of the maxillary segments during transverse expansion using tooth-borne and bone-borne distraction devices. Materials and Methods: An anatomic biomechanical study was performed on 10 dentate human cadaver heads using tooth-borne and bone-borne distraction devices. Results: The amount of tipping of the maxillary halves was greater in the tooth-borne group, but the difference was not significant. Four of the specimens demonstrated an asymmetrical widening of the maxilla. Conclusions: Segmental tipping was seen in both study groups. In this anatomic model, tooth-borne distraction led to greater segmental tipping compared with bone-borne distraction. Keep in mind, however, that this anatomic model by no means depicts a patient situation, and any extrapolation from it must be done with great care. The fact that the tooth-borne group demonstrated greater tipping might reflect the general opinion that bone-borne distraction causes less segmental angulation than tooth-borne distraction. Some tipping was seen in the bone-borne group, suggesting that overcorrection to counteract relapse will be necessary with this treatment modality. (c) 2009 American Association of Oral and Maxillofacial Surgeons
Original languageUndefined/Unknown
Pages (from-to)10-14
Number of pages5
JournalJournal of Oral and Maxillofacial Surgery
Issue number1
Publication statusPublished - 2009

Research programs

  • EMC ONWAR-01-94-01
  • EMC OR-01-59-01

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