Condylar positioning changes following unilateral sagittal split ramus osteotomy in patients with mandibular prognathismReport as inadecuate




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Maxillofacial Plastic and Reconstructive Surgery

, 37:36

First Online: 16 October 2015Received: 27 August 2015Accepted: 08 October 2015

Abstract

BackgroundThis study was performed to evaluate three-dimensional positional change of the condyle using three-dimensional computed tomography 3D-CT following unilateral sagittal split ramus osteotomy USSRO in patients with mandibular prognathism.

MethodsThis study examined two patients exhibiting skeletal class III malocclusion with facial asymmetry who underwent USSRO for a mandibular setback. 3D-CT was performed before surgery, immediately after surgery, and 6 months postoperatively.

After creating 3D-CT images by using the In-vivo 5™ program, the axial plane, coronal plane, and sagittal plane were configured. Three-dimensional positional changes from each plane to the condyle, axial condylar head axis angle AHA, axial condylar head position AHP, frontal condylar head axis angle FHA, frontal condylar head position FHP, sagittal condylar head axis angle SHA, and sagittal condylar head position SHP of the two patients were measured before surgery, immediately after surgery, and 6 months postoperatively.

ResultsIn the first patient, medial rotation of the operated condyle in AHA and anterior rotation in SHA were observed. There were no significant changes after surgery in AHP, FHP, and SHP after surgery. In the second patient, medial rotation of the operated condyle in AHA and lateral rotation of the operated condyle in FHA were observed. There were no significant changes in AHP, FHP, and SHP postoperatively. This indicates that in USSRO, postoperative movement of the condylar head is insignificant; however, medial rotation of the condylar head is possible. Although three-dimensional changes were observed, these were not clinically significant.

ConclusionsThe results of this study suggest that although three-dimensional changes in condylar head position are observed in patients post SSRO, there are no significant changes that would clinically affect the patient.

Abbreviations3D-CTthree-dimensional computed tomography

AHAaxial condylar head long-axis angle

AHPaxial condylar head position

ANSanterior nasal spine

FHAfrontal condylar head long-axis angle

FHPfrontal condylar head position

Ororbitale

Poporion

SHAsagittal condylar head long-axis angle

SHPsagittal condylar head position

USSROunilateral sagittal split ramus osteotomy

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Author: Myung-In Kim - Jun-Hwa Kim - Seunggon Jung - Hong-Ju Park - Hee-Kyun Oh - Sun-Youl Ryu - Min-Suk Kook

Source: https://link.springer.com/



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