Three-dimensional assessment of transverse skeletal changes after surgically assisted rapid maxillary expansion and orthodontic treatment: A prospective computerized tomography study
2012 (English)In: American Journal of Orthodontics and Dentofacial Orthopedics, ISSN 0889-5406, E-ISSN 1097-6752, Vol. 142, no 6, 825-833 p.Article in journal (Refereed) Published
Introduction: The aim of this prospective longitudinal study was to evaluate transverse skeletal changes after surgically assisted rapid maxillary expansion. The changes were registered by using a 3-dimensional computerized tomography technique based on superimposition on the anterior base of the skull. Methods: The subjects comprised 35 patients (mean age, 19.7 years; range, 16.1-43.9 years). Low-dose, helical computerized tomography images were taken at treatment start and after orthodontic treatment. The 3-dimensional models were registered and superimposed at the anterior cranial base. Results: Surgically assisted rapid maxillary expansion had a significant transverse skeletal treatment effect, significantly greater posteriorly than anteriorly. The expansion was parallel anteriorly, but posteriorly there was significant transverse tipping. Although there was no statistically significant difference between the changes at the corresponding landmarks, the range of standard deviations was marked. Conclusions: The results showed that, for registering transverse skeletal changes after surgically assisted rapid maxillary expansion, 3-dimensional superimposition is a reliable method, circumventing projection and measurement errors. Surgically assisted rapid maxillary expansion had a significant but nonuniform skeletal treatment effect. Despite careful surgical separation, pronounced posterior tipping occurred. No correlation was found between the severity of tipping and the patients age. (Am J Orthod Dentofacial Orthop 2012;142:825-33)
Place, publisher, year, edition, pages
Elsevier Masson , 2012. Vol. 142, no 6, 825-833 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-87201DOI: 10.1016/j.ajodo.2012.08.015ISI: 000311635800011OAI: oai:DiVA.org:liu-87201DiVA: diva2:587464