Evaluation of mandibular changes after rapid maxillary expansion: a CBCT study in youngsters with unilateral posterior crossbite using a surface-to-surface matching technique

Objectives The purpose of this study was to evaluate mandibular asymmetry in youngsters with posterior unilateral crossbite (PUXB), through cone-beam computed tomography and reverse engineering technique, before and after rapid maxillary expansion (RME) treatment. Materials and methods Forty cone-be...

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Veröffentlicht in:Clinical oral investigations 2021-04, Vol.25 (4), p.1775-1785
Hauptverfasser: Leonardi, Rosalia Maria, Aboulazm, Khaled, Giudice, Antonino Lo, Ronsivalle, Vincenzo, D’Antò, Vincenzo, Lagravère, Manuel, Isola, Gaetano
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Sprache:eng
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Zusammenfassung:Objectives The purpose of this study was to evaluate mandibular asymmetry in youngsters with posterior unilateral crossbite (PUXB), through cone-beam computed tomography and reverse engineering technique, before and after rapid maxillary expansion (RME) treatment. Materials and methods Forty cone-beam computed tomography (CBCT) images were obtained from all patients at two time points, namely T0 acquired before the placement of a Hyrax expander and T1 after appliance removal. The CBCT scans were segmented and volume rendered into a surface there-dimensional (3D) mesh model. Thereafter, mandibular models were digitally registered by using a “best-fit” algorithm. Surface and volumetric changes, between T0 and T1, were compared by using Student’s t tests. Results A slight increase of 0.45 cm 3 of the total mandibular volume was found at T1 when compared with T0 ( p < 0.001). The mandibular hemi-volume on the crossbite side (CB) was slightly smaller than the non-crossbite side both at T0 and T1. However, the mean differences of hemi-volume from the CB (crossbite) and non-CB side between T0 and T1 show a decrease of 0.26 cm 3 (p < 0.001). Findings for the surface-to-surface deviation analysis demonstrated a fine percentage of matching at T0 which slightly improved at T1 ( p < 0.001). Conclusions Youngsters affected by PUXB showed a very slight and not statistically significant volumetric and morphological asymmetry between CB side and non-CB side at T0. However, the change in mean differences of 0.26 cm cannot be considered clinically relevant. Clinical relevance Mandibles in young PUXB patients exhibit only a very mild mandibular asymmetry. Although the statistically significant mean change found right after RME removal cannot be considered clinically relevant, a more consistent sample and a longer follow-up could be of interest in explaining the short-term findings.
ISSN:1432-6981
1436-3771
DOI:10.1007/s00784-020-03480-5