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Short- and long-term changes of the pharyngeal airway after surgical mandibular advancement in Class II patients-a
Oliver Ristow1, Thomas Rückschloß1, Moritz Berger1
1University of Heidelberg, Department of Oral and Maxillofacial Surgery (Head of Department: Prof. Dr. Dr. J. Hoffmann), Im Neuenheimer Feld 400, D-69120, Heidelberg, Germany.
Purpose:
To evaluate the short- and long-term impact of mandibular-only advancement on pharyngeal airway space (PAS) changes by using cone-beam computed tomography (CBCT) and a new segmentation software. Furthermore, to determine whether a correlation exists between forward movement and PAS gain.
Materials And Methods:
A retrospective evaluation of a homogeneous cohort of Class II patients who had undergone mandibular-only advancement was performed. Pre- (T0), post- (T1), and 1-year post-operative (T2) CBCT scans were obtained in each case, and the changes in PAS parameters (volume and smallest cross-sectional area) were compared with new segmentation software. Mandibular advancement was measured and correlated with PAS parameters.
Results:
A significant postoperative gain in all airway parameters compared with baseline was shown for T1 (p = 0.02), with an additional increase for T2 (p < 0.001). No significant linear association between the movement of the measurement points and any other PAS parameters could be discerned (p > 0.05).
Conclusion:
Our findings indicate that bilateral mandibular-only advancement surgery results in a significant widening of the PAS in Class II patients. Long-term adaption of the PAS also occurs after surgery implying an additional gain of PAS over time. Sicat Air® software seems to be a sufficient and promising tool for PAS evaluation.
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