In search of anatomic truth: 3-dimensional digital modeling and the future of orthodontics

Harrell, William E.; Hatcher, David; Bolt, Raymond L.

doi:10.1067/mod.2002.126147

Cited by 72 publications

(33 citation statements)

References 14 publications

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“…2,3,9,10 The complex movements during surgery for dentofacial deformities clearly need to be assessed in 3 dimensions to improve stability and reduce symptoms of temporomandibular joint disorder after surgery. [11][12][13][14][15][16][17][18][19][20] 3D reconstructions of the mandibular rami and condyles have been based on magnetic resonance imaging or computed tomography. 3,9,21,22 Cone-beam computed tomography (CBCT) scanners with lower radiation doses and lower costs, developed in the late 1990s, have been remarkably useful for their intended craniofacial applications.…”

Section: Conclusion-mentioning

confidence: 99%

Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery

Cevidanes

Bailey

Tucker

et al. 2007

American Journal of Orthodontics and Dentofacial Orthopedics

190

119

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Section: Conclusion-mentioning

confidence: 99%

Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery

Cevidanes

Bailey

Tucker

et al. 2007

American Journal of Orthodontics and Dentofacial Orthopedics

190

119

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“…Various techniques for the reconstruction of 3D CT images have been used in diagnosis, treatment planning and simulation. [5][6][7][8][9][10] Image superimposition for assessment of changes with treatment poses challenges not only because of registration and homology issues, but also because of the choice of landmark locations in anatomic surfaces that lack suitable operational definitions in the three planes of space. 11 -15 The purpose of this study was to evaluate a new system to register models constructed from 3D CBCT, utilizing the grey value image information of the cranial base, instead of landmarks to register pre-and post-surgery scans.…”

Section: Introductionmentioning

confidence: 99%

Superimposition of 3D cone-beam CT models of orthognathic surgery patients

Cevidanes¹,

Bailey²,

Tucker³

et al. 2005

Dentomaxillofacial Radiology

330

233

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Objectives-To evaluate the registration of 3D models from cone-beam CT (CBCT) images taken before and after orthognathic surgery for the assessment of mandibular anatomy and position.Methods-CBCT scans were taken before and after orthognathic surgery for ten patients with various malocclusions undergoing maxillary surgery only. 3D models were constructed from the CBCT images utilizing semi-automatic segmentation and manual editing. The cranial base was used to register 3D models of pre-and post-surgery scans (1 week). After registration, a novel tool allowed the visual and quantitative assessment of post-operative changes via 2D overlays of superimposed models and 3D coloured displacement maps.Results-3D changes in mandibular rami position after surgical procedures were clearly illustrated by the 3D colour-coded maps. The average displacement of all surfaces was 0.77 mm (SD = 0.17 mm), at the posterior border 0.78 mm (SD = 0.25 mm), and at the condyle 0.70 mm (SD = 0.07 mm). These displacements were close to the image spatial resolution of 0.60 mm. The average interobserver differences were negligible. The range of the interobserver errors for the average of all mandibular rami surface distances was 0.02 mm (SD = 0.01 mm).Conclusion-Our results suggest this method provides a valid and reproducible assessment of craniofacial structures for patients undergoing orthognathic surgery. This technique may be used to identify different patterns of ramus and condylar remodelling following orthognathic surgery.

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“…Various techniques for the reconstruction of 3D computed tomography (CT) images have been used in diagnosis, treatment planning, and simulation. [2][3][4][5][6][7][8][9][10][11] However, image superimposition for the assessment of changes with treatment poses many challenges. These challenges refer to registration and homology issues and also to the difficulty of landmark locations on anatomic surfaces.…”

mentioning

confidence: 99%

Image analysis and superimposition of 3-dimensional cone-beam computed tomography models

Cevidanes¹,

Styner²,

Proffit³

2006

American Journal of Orthodontics and Dentofacial Orthopedics

305

200

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Three-dimensional (3D) imaging techniques can provide valuable information to clinicians and researchers. But as we move from traditional 2-dimensional (2D) cephalometric analysis to new 3D techniques, it is often necessary to compare 2D with 3D data. Cone-beam computed tomography (CBCT) provides simulation tools that can help bridge the gap between image types. CBCT acquisitions can be made to simulate panoramic, lateral, and posteroanterior cephalometric radioagraphs so that they can be compared with preexisting cephalometric databases. Applications of 3D imaging in orthodontics include initial diagnosis and superimpositions for assessing growth, treatment changes, and stability. Three-dimensional CBCT images show dental root inclination and torque, impacted and supernumerary tooth positions, thickness and morphology of bone at sites of mini-implants for anchorage, and osteotomy sites in surgical planning. Findings such as resorption, hyperplasic growth, displacement, shape anomalies of mandibular condyles, and morphological differences between the right and left sides emphasize the diagnostic value of computed tomography acquisitions. Furthermore, relationships of soft tissues and the airway can be assessed in 3 dimensions.To routinely benefit from 3-dimensional (3D) imaging, which can provide stacks of axial, lateral, and anteroposterior slices, clinicians need userfriendly tools to construct virtual 3Dmodels. These can be used in initial diagnosis and assessing changes as a result of treatment. Although shape analysis tools have become more readily available, most current software requires some computer expertise.As new tools are developed, we can navigate away from the limitations of conventional cephalometrics, but we still need to allow comparisons to previously acquired cephalograms. 1 It is important to be able to use superimpositions and current images to evaluate growth changes. Various techniques for the reconstruction of 3D computed tomography (CT) images have been used in diagnosis, treatment planning, and simulation. [2][3][4][5][6][7][8][9][10][11] However, image superimposition for the assessment of changes with treatment poses many challenges. These challenges refer to registration and homology issues and also to the difficulty of landmark locations on anatomic surfaces. [12][13][14][15][16] NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript location in each of the 3 planes of space. We describe superimposition methods that do not depend on landmarks or planes but, rather, compare the cranial base structures voxel by voxel of each CT acquisition. These procedures allow us to calculate the rotation and translation parameters between 2 time-point images, display the superimposed 3D virtual models, and measure the distances between the 3D model's surfaces. CONE-BEAM CT DEVICESNewTom 3G (Aperio Services, Sarasota, Fla), i-CAT (Imaging Sciences International, Hatfield, Pa), and CB MercuRay (Hitachi Medical Corporation, Tokyo, Japan) are the conebeam (CB) CT (CBCT) sc...

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In search of anatomic truth: 3-dimensional digital modeling and the future of orthodontics

Cited by 72 publications

References 14 publications

Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery

Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery

Superimposition of 3D cone-beam CT models of orthognathic surgery patients

Image analysis and superimposition of 3-dimensional cone-beam computed tomography models

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