One year postoperative hard and soft tissue volumetric changes after a BSSO mandibular advancement

Abstract In this study, cone beam computed tomography (CBCT) and three dimensional (3D) stereophotogrammetry are used to compare the 3D skeletal and soft tissue changes caused by a bilateral sagittal split osteotomy (BSSO) 1 year after a mandibular advancement. Eighteen consecutive patients with a h...

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Bibliographic Details
Published in:International journal of oral and maxillofacial surgery 2012-09, Vol.41 (9), p.1137-1145
Main Authors: Maal, T.J.J, de Koning, M.J.J, Plooij, J.M, Verhamme, L.M, Rangel, F.A, Bergé, S.J, Borstlap, W.A
Format: Article
Language:English
Subjects:
Adolescent
Adult
Biological and medical sciences
Cephalometry - instrumentation
Cone-Beam Computed Tomography
cone-beam CT
Dentistry
Face - anatomy & histology
Female
Humans
Imaging, Three-Dimensional
Male
Malocclusion, Angle Class II - surgery
Mandibular Advancement - methods
Mandibular Condyle - physiology
Medical sciences
Middle Aged
oral and maxillofacial surgery
orthognathic surgery
Osteotomy, Sagittal Split Ramus - methods
Otorhinolaryngology. Stomatology
Outcome Assessment (Health Care) - methods
stereophotogrammetry
Surgery
surgical evaluation and simulation
three-dimensional imaging
Young Adult
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Summary:Abstract In this study, cone beam computed tomography (CBCT) and three dimensional (3D) stereophotogrammetry are used to compare the 3D skeletal and soft tissue changes caused by a bilateral sagittal split osteotomy (BSSO) 1 year after a mandibular advancement. Eighteen consecutive patients with a hypoplastic mandible were treated with a BSSO according to the Hunsuck modification. Preoperatively and 1 year postoperatively, a CBCT scan was acquired and a 3D photograph. The pre- and postoperative CBCT scans were matched using voxel based registration. After registration, the mandible could be segmented in the pre- and postoperative scans. The preoperative scan was subtracted from the postoperative scan, resulting in the hard tissue difference. To investigate the soft tissue changes, the pre- and postoperative 3D photographs were registered using surface based registration. After registration the preoperative surface could be subtracted from the postoperative surface, resulting in the overall volumetric difference. As expected, a correlation between mandibular advancent and volumetric changes of the hard tissues was found. The correlation between advancement and soft tissues was weak. The labial mental fold stretched after surgery. This study proved that using 3D imaging techniques it is possible to document volumetric surgical changes accurately and objectively.
ISSN:0901-5027
1399-0020
DOI:10.1016/j.ijom.2012.04.004