Posterior transpalatal distraction with pterygoid disjunction: A short-term model study

Claudio Matteini, Maurice Y. Mommaerts

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)


The transpalatal distractor (TPD) allows for maxillary expansion according to the concepts of distraction osteogenesis. Unlike tooth-borne, surgically assisted rapid palatal expansion devices, the bone-borne TPD is designed to avoid periodontal ligament compression, buccal root resorption, fenestration, tooth tipping, and orthodontic relapse during and after the expansion. When the distractor is placed on the palate at the level of the second premolar and pterygomaxillary disjunction is not performed, more expansion occurs in the anterior part of the maxilla than it does in the posterior. The aim of this investigation was to test the hypothesis that pterygomaxillary disjunction and placement of the TPD on the palate at the level of the first molars result in more parallel expansion of the maxillary segments. Twenty consecutive patients were included in a prospective way, and their predistraction and postdistraction models were electronically analyzed. The change in resistance and force application resulted, on average, in parallel segment expansion. The results showed that pterygomaxillary disjunction and posterior placement of the TPD are indicated for patients having transverse maxillary deficiency with lateroposterior crossbite.

Original languageEnglish
Pages (from-to)498-502
Number of pages5
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Issue number5
Publication statusPublished - 1 Jan 2001


Dive into the research topics of 'Posterior transpalatal distraction with pterygoid disjunction: A short-term model study'. Together they form a unique fingerprint.

Cite this