Validation of conventional 2D lateral cephalometry using 3D cone beam CT

Shaw, Karen; McIntyre, Grant T; Mossey, Peter; Menhinick, Alison; Thomson, Donald

doi:10.1179/1465313312y.0000000009

Cited by 18 publications

(14 citation statements)

References 24 publications

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“…Measurement of soft-tissue models obtained from CBCTor CT imaging using Mimics has been confirmed as a valid method in various studies [ 49 , 50 ]. Correlation of the initial measurements and follow-up measurements in the present study also showed that the measurement method is extremely accurate.…”

Section: Discussionmentioning

confidence: 99%

Influence of maxillary advancement surgery on skeletal and soft-tissue changes in the nose — a retrospective cone-beam computed tomography study

et al. 2015

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ObjectivesSurgical correction of skeletal maxillary retroposition is often associated with changes in the morphology of the nose. Unwanted alar flaring of the nose is observed in many cases. The aim of the present study was therefore to investigate the influence of surgical advancement of the maxilla on changes in the soft-tissue morphology of the nose. Having a coefficient that allows prediction of change in the nasal width in Caucasian patients after surgery would be helpful for treatment planning.Materials and methodsAll 33 patients included in this retrospective study were of Caucasian descent and had skeletal Class III with maxillary retrognathia. They were all treated with maxillary advancement using a combination of orthodontic and maxillofacial surgery methods. Two cone-beam computed tomography (CBCT) datasets were available for all of the study's participants (16 female, 17 male; age 24.3 ± 10.4 years): the first CBCT imaging was obtained before the planned procedure (T0) and the second 14.1 ± 6.4 months postoperatively (T1). Morphological changes were recorded three-dimensionally using computer-aided methods (Mimics (Materialise NV, Leuven/Belgium), Geomagic (Geomagics, Morrisville/USA)). Statistical analysis was carried out using SPSS 21 for Mac.ResultsThe mean sagittal advancement of the maxilla was 5.58 mm. The width of the nose at the alar base (Alb) changed by a mean of + 2.59 mm (±1.26 mm) and at the ala (Al) by a mean of + 3.17 mm (±1.32 mm). Both of these changes were statistically highly significant (P = 0.000). The increase in the width of the nose corresponded to approximately half of the maxillary advancement distance in over 80 % of the patients. The nasolabial angle declined by an average of −6.65° (±7.71°).ConclusionsMaxillary advancement correlates with a distinct morphological change in nasal width. This should be taken into account in the treatment approach and in the information provided to patients.

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Section: Discussionmentioning

confidence: 99%

Influence of maxillary advancement surgery on skeletal and soft-tissue changes in the nose — a retrospective cone-beam computed tomography study

et al. 2015

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“…This difference can be justified by the fact that the measurements obtained from the 2D technique determine a projection of the points, which in reality are placed on different planes. Differently, the planes measured using the 3D technique are based on a real measurement (an oblique plane on the sagittal axis) rather than prospective ones [6–8]. Hence, the real measurement for the two-dimensional technique is represented by its projection with the consequent result that measurements obtained from the 2D radiographs are less accurate than the ones obtained from the 3D radiographs [19, 20].…”

Section: Discussionmentioning

confidence: 99%

Assessment of inter- and intra-operator cephalometric tracings on cone beam CT radiographs: comparison of the precision of the cone beam CT versus the latero-lateral radiograph tracing

et al. 2014

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BackgroundIn this study we aimed at quantifying the possible errors which may occur when assessing specific reference planes and linear derivants on cephalometric radiographs traced manually and digitally. Furthermore, we have compared the precision of the tracings according to both the two- and three-dimensional (2D and 3D respectively) techniques and between clinicians.FindingsWe have obtained via cone beam computed tomography (CBCT) archive of the orthodontics department of the University of Milan 20 cone beam CT radiographs from which we have obtained 20 latero-lateral radiographs. Five independent clinicians referred to as A, B, C, D, E have been randomly selected to trace both radiographs maintaining the same working and lighting conditions to minimize the possibility of operator- and environment-dependent errors from occurring. The results have been statistically assessed by Student’s t test. The comparison of the data gathered from the tracings in 2D and 3D shows that certain measurements have statistically significant differences. Particularly, the difference in the measurements of the sagittal dimension of the mandible and the anterior and posterior nasal spines has resulted to be statistically significant. The results of the intra-operator comparison proved that the 3D technique is extremely precise.ConclusionOur study determines that the 3D technique allows to obtain more precise results and with several advantages when compared to the conventional technique such as a true representation of the anatomical structures, less risk of errors occurring due to clinician skills and absence of overlapping anatomical structures.

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“…CBCT exposes patients to greater radiation doses than conventional lateral cephalograms [44–47] and therefore its application in the context of cross-sectional studies is not ethically justifiable. Furthermore, conventional lateral cephalograms and those derived from 3D CBCTs demonstrated no significant differences in most linear and angular cephalometric measurements [48–50] and more specifically in the UAS area [51]. Linear 2D cephalometric measurements relate well to three-dimensional magnetic resonance imaging measurements [52].…”

Section: Discussionmentioning

confidence: 99%

Cephalometrics of Pharyngeal Airway Space in Lebanese Adults

Daraze

Delatte

Liistro

et al. 2017

International Journal of Dentistry

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Purpose. The upper airway space is significant in orthodontic diagnosis and treatment planning. The objectives of this study are to assess the dimensions of soft tissue elements of the upper pharyngeal space and evaluate potential correlations with modifying variables such as gender, skeletal class, and anthropometric parameters. Materials and Methods. Lateral cephalograms were obtained from 117 healthy young adult Lebanese subjects. Nineteen cephalometric linear/angular measurements of the nasopharynx, oropharynx, and hypopharynx were recorded. Anthropometric parameters including body mass index and neck circumference were measured. Results. Significant differences were demonstrated for 12 out of the 19 parameters considered between genders. Uvula and tongue dimensions and the distances between epiglottis-posterior pharyngeal wall and epiglottis-posterior nasal spine were significantly larger in males. The anteroposterior inclination of the uvula and the distances between the uvula and posterior pharyngeal wall were significantly greater in females. No significant differences were found between skeletal classes relative to most of the variables. Body mass index and neck circumference were positively correlated with the dimensions of tongue and uvula. Conclusions. Sexual dimorphism relative to some cephalometric variables and anthropometric parameters may account partly for larger oronasopharyngeal spaces in females. Anthropometric data need to be accounted for in population-related comparisons.

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Validation of conventional 2D lateral cephalometry using 3D cone beam CT

Abstract: Measurements used in the Eastman cephalometric analysis derived from 2D cephalometric lateral skull images are comparable to those derived from 3D CBCT images.

Cited by 18 publications

References 24 publications

Influence of maxillary advancement surgery on skeletal and soft-tissue changes in the nose — a retrospective cone-beam computed tomography study

Influence of maxillary advancement surgery on skeletal and soft-tissue changes in the nose — a retrospective cone-beam computed tomography study

Assessment of inter- and intra-operator cephalometric tracings on cone beam CT radiographs: comparison of the precision of the cone beam CT versus the latero-lateral radiograph tracing

Cephalometrics of Pharyngeal Airway Space in Lebanese Adults

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