"Direct DICOM Slice Landmarking” A Novel Research Technique to Quantify Skeletal Changes in Orthognathic Surgery

Almukhtar, Anas; Khambay, Balvinder; Ayoub, Ashraf; Ju, Xiangyang; Al-Hiyali, Ali; MacDonald, J. G.; Jabar, Norhayati; Goto, Tazuko K.

doi:10.1371/journal.pone.0131540

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…Color-coded distances are an analytical tool incorporated in most computer-aided design software packages to measure the relative distance or deviation between two 3D surface meshes (23). Previous studies had used the color mapping method to assess 3D hard tissue displacement (8,24).…”

Section: Discussionmentioning

confidence: 99%

Accuracy between virtual surgical planning and actual outcomes in orthognathic surgery by iterative closest point algorithm and color maps: A retrospective cohort study

Marlière¹,

Demétrio²,

Schmitt³

et al. 2019

Med Oral

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Background To evaluate the accuracy between actual outcomes and virtual surgical planning (VSP) in orthognathic surgery regarding the use of three-dimensional (3D) surface models for registration using iterative closest point (ICP) algorithm and generated color maps. Material and Methods Construction of planning and postoperative 3D models in STL files format (M0 and M1, respectively) from CBCT of 25 subjects who had been submitted to bimaxillary orthognathic surgery was performed. M0 and M1 were sent to Geomagic software in semi-automatic alignment surface mesh order of M0 and M1 for registration using ICP algorithm to calculate mean deviation (MD, MD+, MD-, SD) and root mean square (RMS – 3D Error). Color maps were generated to assess qualitative congruence between M0 and M1. From deviation analysis, 3D Error was defined as accuracy measurement. To assess the reproducibility, the workflow was performed by two evaluators multiple times. t-tests were used to assess whether all means of MD, MD+, MD-, SD and 3D Error values would be ≤ - 2 mm and ≥ 2 mm. Results High intra and inter evaluators correlation were found, supporting the reproducibility of the workflow. t-tests proved that all MDs and 3D Error values were > - 2 mm and < 2 mm. Conclusions 3D error mean was within the standards of clinical success lower than 2 mm. ICP algorithm provided a reproducible method of alignment between 3D models and generated color maps to evaluate 3D congruence but did not answer all methodological parameters regarding the assessment of accuracy in orthognathic surgery. Key words: Accuracy, Cone-Beam computed tomography, CAD-CAM, Orthognathic surgery, three-dimensional imaging.

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Section: Discussionmentioning

confidence: 99%

Accuracy between virtual surgical planning and actual outcomes in orthognathic surgery by iterative closest point algorithm and color maps: A retrospective cohort study

Marlière¹,

Demétrio²,

Schmitt³

et al. 2019

Med Oral

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“…17 This was mainly due to the absence of information related to the 3D directional changes. The earlier landmmark based analysis helped in identifying the direction of the displacement at selected regions [16][17][18][19] but it was difficult to determine the extent of these changes. Researchers modified this approach to overcome this problem, four horizontal and two vertical planes were anatomically oriented to segment the facial surface into ten regions.…”

Section: Discussionmentioning

confidence: 99%

“…16 To quantify maxillary movements measurements were taken as the mean displacement of three anatomical landmarks on the maxilla (incisive foramen, right and left greater palatine foramina) and the mean of three landmarks on the mandible (genial tubercle, right and left mental foramina) due to surgery. The differences between the preoperative and postoperative position of these points in relation to the common reference planes in the x, y, z directions were recorded as the skeletal displacements.…”

Section: Methodsmentioning

confidence: 99%

State-of-the-art three-dimensional analysis of soft tissue changes following Le Fort I maxillary advancement

Almukhtar

Ayoub

Khambay

et al. 2016

British Journal of Oral and Maxillofacial Surgery

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Abstract:Aim; This study was carried out to provide a comprehensive description of facial changes following Le Fort I osteotomy and introducing a novel tool for facial anthropometric analysis. Materials & methods; This study was carried out on 33 patients who had had Le Fort I maxillary advancement with or without posterior vertical impaction. The investigation was conducted on the CBCT images which were captured one month before surgery and 6 to 12 months postoperatively. Two types of the analysis were applied in this study, the Euclidian corresponding

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“…cheek area. Based on a recently published study it will be possible to determine the 3D soft tissue changes of the soft tissue as a result of the underlying 3D hard tissue changes following orthognathic surgery using conebeam CT (CBCT) data [ 14 ]. This was however beyond the scope of the present study and taking CBCT of healthy volunteers to assess mandibular changes was unethical.…”

Section: Discussionmentioning

confidence: 99%

The Accuracy of Conformation of a Generic Surface Mesh for the Analysis of Facial Soft Tissue Changes

et al. 2016

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PurposeThree dimensional analysis of the face is required for the assessment of complex changes following surgery, pathological conditions and to monitor facial growth. The most suitable method may be “dense surface correspondence”.Materials and MethodsThis method utilizes a generic facial mesh and “conformation process” to establish anatomical correspondences between two facial images. The aim of this study was to validate the use of conformed meshes to measure simulated maxillary and mandibular surgical movements. The “simulation” was performed by deforming the actual soft tissues of the participant during image acquisition. The study was conducted on 20 volunteers and used 77 facial landmarks pre-marked over six anatomical regions; left cheek, right cheek, left upper lip, philtrum, right upper lip and chin region. Each volunteer was imaged at rest and after performing 5 different simulated surgical procedures using 3D stereophotogrammetry. The simulated surgical movement was determined by measuring the Euclidean distances and the mean absolute x, y and z distances of the landmarks making up the six regions following digitization. A generic mesh was then conformed to each of the aligned six facial 3D images. The same six regions were selected on the aligned conformed simulated meshes and the surgical movement determined by determining the Euclidean distances and the mean absolute x, y and z distances of the mesh points making up the six regions were determined.ResultsIn all cases the mean Euclidian distance between the simulated movement and conformed region was less than 0.7mm. For the x, y and z directions the majority of differences in the mean absolute distances were less than 1.0mm except in the x-direction for the left and right cheek regions, which was above 2.0mm.ConclusionsThis concludes that the conformation process has an acceptable level of accuracy and is a valid method of measuring facial change between two images i.e. pre- and post-surgery. The conformation accuracy is higher toward the center of the face than the peripheral regions.

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"Direct DICOM Slice Landmarking” A Novel Research Technique to Quantify Skeletal Changes in Orthognathic Surgery

Cited by 11 publications

References 15 publications

Accuracy between virtual surgical planning and actual outcomes in orthognathic surgery by iterative closest point algorithm and color maps: A retrospective cohort study

Accuracy between virtual surgical planning and actual outcomes in orthognathic surgery by iterative closest point algorithm and color maps: A retrospective cohort study

State-of-the-art three-dimensional analysis of soft tissue changes following Le Fort I maxillary advancement

The Accuracy of Conformation of a Generic Surface Mesh for the Analysis of Facial Soft Tissue Changes

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