Assessing the length of the mandibular ramus and the condylar process: a comparison of OPG, CBCT, CT, MRI, and lateral cephalometric measurements

Markic, Goran; Müller, Lukas; Patcas, Raphael; Roos, Małgorzata; Lochbühler, Nina; Peltomäki, Timo; Karlo, Christoph; Ullrich, Oliver; Kellenberger, Christian J.

doi:10.1093/ejo/cju008

Cited by 46 publications

(35 citation statements)

References 53 publications

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“…Considering that studies comparing conventional computed tomography (CT) or cone-beam computed tomography (CBCT) to LCR showed very similar differences in lateral cephalometric measurements [21, 27, 28] and that CT-techniques are geometrically accurate under normal conditions [29], it is legitimate to compare these results to ours. The hypothesis that intrinsic limitations of LCR were the main error source in the present study is strongly supported by ex vivo studies, which showed very high concordance between measurements on MRI and CT [30] or MRI and CBCT [31] [32]. …”

Section: Discussionsupporting

confidence: 72%

Lateral cephalometric analysis for treatment planning in orthodontics based on MRI compared with radiographs: A feasibility study in children and adolescents

et al. 2017

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ObjectiveThe objective of this prospective study was to evaluate whether magnetic resonance imaging (MRI) is equivalent to lateral cephalometric radiographs (LCR, “gold standard”) in cephalometric analysis.MethodsThe applied MRI technique was optimized for short scanning time, high resolution, high contrast and geometric accuracy. Prior to orthodontic treatment, 20 patients (mean age ± SD, 13.95 years ± 5.34) received MRI and LCR. MRI datasets were postprocessed into lateral cephalograms. Cephalometric analysis was performed twice by two independent observers for both modalities with an interval of 4 weeks. Eight bilateral and 10 midsagittal landmarks were identified, and 24 widely used measurements (14 angles, 10 distances) were calculated. Statistical analysis was performed by using intraclass correlation coefficient (ICC), Bland-Altman analysis and two one-sided tests (TOST) within the predefined equivalence margin of ± 2°/mm.ResultsGeometric accuracy of the MRI technique was confirmed by phantom measurements. Mean intraobserver ICC were 0.977/0.975 for MRI and 0.975/0.961 for LCR. Average interobserver ICC were 0.980 for MRI and 0.929 for LCR. Bland-Altman analysis showed high levels of agreement between the two modalities, bias range (mean ± SD) was -0.66 to 0.61 mm (0.06 ± 0.44) for distances and -1.33 to 1.14° (0.06 ± 0.71) for angles. Except for the interincisal angle (p = 0.17) all measurements were statistically equivalent (p < 0.05).ConclusionsThis study demonstrates feasibility of orthodontic treatment planning without radiation exposure based on MRI. High-resolution isotropic MRI datasets can be transformed into lateral cephalograms allowing reliable measurements as applied in orthodontic routine with high concordance to the corresponding measurements on LCR.

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Section: Discussionsupporting

confidence: 72%

Lateral cephalometric analysis for treatment planning in orthodontics based on MRI compared with radiographs: A feasibility study in children and adolescents

et al. 2017

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“…The observed accuracies (in terms of mean, distribution and range of the average differences) are similar to the results portrayed in various other investigations for linear measurements performed with isosurface (Periago et al, 2008), direct volume rendering (Fernandes et al, 2014), MPR (Sun et al, 2011, Patcas et al, 2012, Patel et al, 2014 and maximum intensity projection (Markic et al, 2015), all demonstrating insufficient sub-millimetre accuracy for sub-millimetre voxel data.…”

Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 86%

Method of visualisation influences accuracy of measurements in cone-beam computed tomography

Patcas

Angst

Kellenberger

et al. 2015

Journal of Cranio-Maxillofacial Surgery

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“…Moreover, these studies have used magnetic resonance imaging and laser scans to measure facial morphology. 27,28 The present study, to our knowledge, is the first to report a relationship between GHR gene variants and threedimensional mandibular morphology using CBCT imaging, which accurately measures not only soft tissues but also bone morphology, 29 and is therefore useful for examining the complex structure of the mandible.…”

Section: Discussionmentioning

confidence: 71%

Growth hormone receptor gene variant and three-dimensional mandibular morphology

Nakawaki

Yamaguchi

Isa

et al. 2016

The Angle Orthodontist

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Objective: To examine the relationship between three-dimensional mandibular morphology and growth hormone receptor (GHR) gene variants in a healthy Japanese population. Materials and Methods: The subjects, who were unrelated Japanese orthodontic patients, consisted of 64 men and 114 women. Using the Taqman genotyping assay, GHR gene rs6184 and rs6180 variants were detected in genomic DNA extracted from saliva. Mandibular volume and length were measured from cone-beam computed tomography images that were analyzed using Analyze image-processing software. The relationship between GHR gene variants and threedimensional mandibular morphology was statistically examined. Results: Statistical significance for the relationship between the distance between the left and right coronoid processes and rs6180 was noted (P , .05). Conclusion: Our results indicate that the GHR variant rs6180 is associated with the distance between the left and right coronoid process in the Japanese subjects. (Angle Orthod. 2017;87:68-73)

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Assessing the length of the mandibular ramus and the condylar process: a comparison of OPG, CBCT, CT, MRI, and lateral cephalometric measurements

Cited by 46 publications

References 53 publications

Lateral cephalometric analysis for treatment planning in orthodontics based on MRI compared with radiographs: A feasibility study in children and adolescents

Lateral cephalometric analysis for treatment planning in orthodontics based on MRI compared with radiographs: A feasibility study in children and adolescents

Method of visualisation influences accuracy of measurements in cone-beam computed tomography

Growth hormone receptor gene variant and three-dimensional mandibular morphology

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