Virtual Surgical Analysis: Long-Term Cone Beam Computed Tomography Stability Assessment of Segmental Bimaxillary Surgery

Virtual Surgical Analysis Mar 26, 2022


Holte MB, Diaconu A, Ingerslev J, Thorn JJ & Pinholt EM

Published in: International Journal of Oral and Maxillofacial Surgery; March 26, 2022
Virtual surgical analysis: long-term cone beam computed tomography stability assessment of segmental bimaxillary surgery
The assessment of the stability of orthognathic surgery is often time-consuming, relieson manual re-identification of anatomical landmarks, and has been based on short-termfollow-up. The purpose of this study was to propose and validate a semi-automatedapproach for three-dimensional (3D) assessme…


Stability assessment of orthognathic surgery is often time consuming, relies on manual re-identification of anatomical landmarks and on short-term follow-up. The purpose of the present study was to propose and validate a semi-automatic approach for three-dimensional assessment of long-term stability of segmental bimaxillary surgery. The approach was developed and validated using postoperative two weeks and two years cone-beam computerized tomography scans. The stability of the surgical outcome was calculated as three-dimensional translational and rotational differences between the short- and long-term postoperative positions of the individual bone segments. For reliability evaluation, intra-class correlation coefficients were calculated at a 95% confidence interval on measurements of two observers. Ten subjects (six male; four female; mean age 24.4 years) class II and III, who underwent a combined three-piece Le Fort I osteotomy, bilateral sagittal split osteotomy and genioplasty, were included in the study. The intra- and inter-observer reliability was excellent, range [0.82 – 0.99]. The range of the mean absolute difference of the intra- and inter-observer translational and rotational measurements were [0.14 mm (0.13) – 0.44 mm (0.50)] and [0.20˚ (0.16) – 0.92˚ (0.78)]. The approach has excellent reliability for three-dimensional assessment of long-term stability of segmental bimaxillary surgery.


Michael Boelstoft Holte

Along with Alexandru Diaconu, Janne Ingerslev, Jens Jørgen Thorn, Else Marie Pinholt

Head of 3D Lab Denmark