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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

Published in:

01-07-2021 | Original Article

Three-dimensional changes in the location of soft tissue landmarks following bimaxillary orthognathic surgery

Authors: Lecturer Gökhan Çoban, Professor İbrahim Yavuz, Associate Professor Ahmet Emin Demirbaş

Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Issue 4/2021

Abstract

Objectives

We sought to determine the amount of three-dimensional (3D) movement of soft tissue landmarks in patients who underwent bimaxillary orthognathic surgery.

Materials and methods

We recruited 28 patients (11 women and 17 men), who had received one-piece Le Fort I osteotomy with maxillary advancement and impaction, and bilateral sagittal split ramus osteotomy for mandibular setback. The 3D images were acquired 1–7 days before surgery and at least 6 months after surgery using stereophotogrammetry. We recorded 50 coordinate measurements and correlated the movements between soft and hard tissues. Paired samples t‑test, independent samples t‑test, and Pearson’s correlation analysis were used for statistical analysis.

Results

Patients’ ages ranged from 17–31 years (mean 20.4 ± 3.0 years). The mean advancement and impaction of the maxilla was 4.7 ± 1.2 and 2.2 ± 1.0 mm, respectively. The mean setback of the mandible was 4.2 ± 1.6 mm. Menton (Me) moved significantly closer to the midsagittal plane, and the bilateral alare (Al) and alar curvature (Ac) moved laterally. In addition, pronasale (Prn), bilateral Al, Ac, subnasale (Sn), subspinale (Ss), labiale superior (Ls), sublabiale (Sl), pogonion (Pog), and Me moved upwards. The bilateral cheek bone (Cbp), Al, Ac, Prn, Sn, Ss, Ls, and stomion (Sto) moved forward. Li, Sl, Pog, and Me moved backward. Interestingly, poor correlation was found between soft tissue landmarks and hard tissue movements.

Conclusion

We observed 3D coordinate changes in several soft tissue landmarks in the middle and lower thirds of the face. The results of this study may be useful for estimating postoperative changes in similar patients.

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Title: Three-dimensional changes in the location of soft tissue landmarks following bimaxillary orthognathic surgery
Authors: Lecturer Gökhan Çoban
Professor İbrahim Yavuz
Associate Professor Ahmet Emin Demirbaş
Publication date: 01-07-2021
Publisher: Springer Medizin
Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Issue 4/2021
Print ISSN: 1434-5293
Electronic ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-021-00279-1

At a glance: The STEP trials

Springer Medicine

Three-dimensional changes in the location of soft tissue landmarks following bimaxillary orthognathic surgery

Abstract

Objectives

Materials and methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusion

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