Short- and long-term skeletal relapse after mandibular advancement surgery

Eggensperger, N; Smolka, K; Luder, J; Iizuka, T (2006). Short- and long-term skeletal relapse after mandibular advancement surgery. International journal of oral & maxillofacial surgery, 35(1), pp. 36-42. Maryland Heights, Mo.: Elsevier 10.1016/j.ijom.2005.04.008

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This study analyzes short- and long-term skeletal relapse after mandibular advancement surgery and determines its contributing factors. Thirty-two consecutive patients were treated for skeletal Class II malocclusion during the period between 1986 and 1989. They all had combined orthodontic and surgical treatment with BSSO and rigid fixation excluding other surgery. Of these, 15 patients (47%) were available for a long-term cephalography in 2000. The measurement was performed based on the serial cephalograms taken preoperatively; 1 week, 6 months and 14 months postoperatively; and at the final evaluation after an average of 12 years. Mean mandibular advancement was 4.1 mm at B-point and 4.9 mm at pogonion. Representing surgical mandibular ramus displacement, gonion moved downwards 2 mm immediately after surgery. During the short-term postoperative period, mandibular corpus length decreased only 0.5 mm, indicating that there was no osteotomy slippage. After the first year of observation, skeletal relapse was 1.3 mm at B-point and pogonion. The relapse continued, reaching a total of 2.3 mm after 12 years, corresponding to 50% of the mandibular advancement. Mandibular ramus length continuously decreased 1 mm during the same observation period, indicating progressive condylar resorption. No significant relationship between the amount of initial surgical advancement and skeletal relapse was found. Preoperative high mandibulo-nasal plane (ML-NL) angle appears to be associated with long-term skeletal relapse.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Craniomaxillofacial Surgery
UniBE Contributor:	Eggensperger, Nicole, Smolka, Koord Maximilian Wilke, Iizuka, Tateyuki
ISSN:	0901-5027
ISBN:	16344217
Publisher:	Elsevier
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:46
Last Modified:	05 Dec 2022 14:14
Publisher DOI:	10.1016/j.ijom.2005.04.008
PubMed ID:	16344217
Web of Science ID:	000234262800005
URI:	https://boris.unibe.ch/id/eprint/19305 (FactScience: 1835)