The effects of maxillary movement on nasal septum and internal nasal valve following Le Fort I osteotomy: A CBCT study
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Abstract
Objective: Le Fort I osteotomy (LF-IO) is a technique for the correction of dentofacial deformities, resulting in significant anterior nasal change. This study aimed to investigate the effect of different maxillary movements on the nasal septum (NS) and internal nasal valve (INV) after LF-IO with cone beam computed tomography (CBCT) images. Materials and Methods: A retrospective study including 39 patients who underwent LF-IO and received CBCT pre-operatively and 6-to-12-month post-operative evaluation was performed. All patients were divided into three groups according to their maxillary movement direction. Group 1 underwent maxillary advancement, group 2 underwent maxillary impaction, and group 3 (combination) underwent both maxillary advancement and impaction. NS angle at nasion level, INV angle, and INV area at pre-operative and post-operative period on CBCT images were measured and evaluated. Results: The median of NS angle and the mean INV angle had a significant increase post-operatively in all three groups. However, INV area showed no statistically significant change after surgery. When the amount of the changes among the three groups were compared, the results revealed no statistically significant change in all three groups. Correlation between changes of NS angle and the magnitude of maxillary advancement was moderately positive with statistically significant difference. Conclusions: Advancement and impaction of maxilla in LF-IO influenced an increase in the NS angle and INV angle. A moderately positive correlation between changes of NS angle and the magnitude of maxillary advancement was found.
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