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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/25489

Title: Short-term hard and soft tissue changes after mandibular advancement surgery in Class II patients: a retrospective cephalometric study
Authors: Storms, A. S.
Miclotte, A.
Grosjean, L.
de Llano-Perula, M. Cadenas
Alqerban, A.
Fieuws, Steffen
Sun, Yi
Politis, Constantinus
Verdonck, A.
Willems, Gert
Issue Date: 2017
Citation: EUROPEAN JOURNAL OF ORTHODONTICS, 39(5), p. 567-576
Abstract: Aim:The aim of this study was to describe hard and soft tissue changes after mandibular advancement surgery and to investigate the possible differences between Class II facial patterns. Materials and methods:Lateral cephalograms of 109 patients who underwent combined orthodontic treatment and bilateral sagittal split osteotomy (BSSO) were studied. Radiographs were taken within 6 weeks before surgery (T0) and at least 6 months postoperatively (T1). Patients were classified into 3 groups according to the preoperative mandibular plane angle. Hard- and soft-tissue changes were analysed with an x-y cranial base coordinate system. Measurements were evaluated statistically. Results:Soft and hard tissues of the chin moved forward and downward. The position of the upper lip remained unchanged, while the lower lip moved forward and upward and decreased in thickness. The soft tissue points of the chin follow their corresponding skeletal points almost completely, while the change of the lower lip was only 76 per cent of the movement of the underlying hard tissue. The increase of SNB was more evident in the low-angle group, as well as improvement of the facial convexity. Stomium superius moved more forward in the low-and medium-angle cases. Ratios of hard and soft tissue changes showed no differences for different facial patterns. Limitations:Limitations derived from the retrospective study design. Only short-term changes could be addressed. The distinction between surgical changes and changes due to skeletal relapse is difficult to assess. Also, the difficulty to reproduce a relaxed lip position during imaging may influence our results. Conclusion:Class II characteristics improved after mandibular advancement. Soft tissues of the chin follow their skeletal structures almost in a 1:1 relationship, while movement of the lower lip was less predictable. The facial pattern of Class II patients should be considered in treatment planning.
Notes: [Storms, A. S.; Miclotte, A.; de Llano-Perula, M. Cadenas; Verdonck, A.; Willems, G.] Katholieke Univ Leuven, Dept Oral Hlth Sci Orthodont, Kapucijnenvoer 7, B-3000 Leuven, Belgium. [Storms, A. S.; Miclotte, A.; de Llano-Perula, M. Cadenas; Verdonck, A.; Willems, G.] Univ Hosp Leuven, Dent, Leuven, Belgium. [Grosjean, L.; Sun, Y.; Politis, C.] Univ Hosp Leuven, Dept Oral & Maxillofacial Surg, Leuven, Belgium. [Alqerban, A.] Prince Sattam Bin Abdulaziz Univ, Dept Prevent Dent Sci, Coll Dent, Al Kharj, Saudi Arabia. [Fieuws, S.] Katholieke Univ Leuven, Interunivers Inst Biostat & Stat Bioinformat, Leuven, Belgium. [Fieuws, S.] Univ Hasselt, Hasselt, Belgium.
URI: http://hdl.handle.net/1942/25489
DOI: 10.1093/ejo/cjx003
ISI #: 000412223000016
ISSN: 0141-5387
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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