Skeletal and dental changes after rapid maxillary expansion: a computed tomography study
Online veröffentlicht: 14. Dez. 2023
Seitenbereich: 141 - 148
Eingereicht: 01. Dez. 2009
Akzeptiert: 01. Juni 2010
DOI: https://doi.org/10.2478/aoj-2010-0023
© 2010 Ahmed Ghoneima et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Objectives
To investigate the skeletal and dental changes induced by rapid maxillary expansion, using computed tomography (CT) scans and three-dimensional (3-D) reconstructed images.
Methods
Twenty patients (Mean age: 12.3 ± 1.9 years) who required rapid maxillary expansion as a part of their comprehensive orthodontic treatment underwent pretreatment (T1) and post-treatment (T2) CT scans. The T2 – T1 differences between selected skeletal and dental measurements on the coronal CT and 3-D volumetric images were compared using the Wilcoxon signed ranks test.
Results
At T2 the Maxillary alveolar width (4.5 ± 3.5 mm) was greater than the Maxillary base width (1.7 ± 0.9 mm). The greatest transverse dental change was in the Intermolar width (6.3 ± 2.1 mm and 2.7 ± 1.9 mm at the crown and the apex, respectively). On the 3-D volume, significant increases occurred in the Bicondylar width (1.2 ± 1.3 mm), Bimaxillo-mandibular width (2.1 ± 2.3 mm) and the Maxillary width (2.5 ± 1.6 mm). The greatest change in the dental measurements was in the Maxillary first molar width (6.4 ± 0.1 mm). The Maxillary central incisor angle decreased significantly (-7.9 ± 8.4 mm), indicating an increase in the distance between the apices of the central incisors.
Conclusion
Volumetric 3-D CT scanning provides a useful method for assessing skeletal and dental changes after rapid maxillary expansion. Although significant increases occurred in most skeletal and dental measures, it appears that dental tipping explains most of the expansion.