Evaluation of upper airway obstruction in Class II children with fluid-mechanical simulation

Iwasaki, Tomonori; Saitoh, Issei; Takemoto, Yoshihiko; Inada, Emi; Kanomi, Ryuzo; Hayasaki, Haruaki; Yamasaki, Yuichi

doi:10.1016/j.ajodo.2010.08.014

Cited by 52 publications

(51 citation statements)

References 21 publications

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“…Iwasaki et al 28 showed that while the size of the upper airway did not differ statistically among facial types, the simulated maximal pressure and velocity of the dolichofacial type were significantly higher than those of the brachyfacial type. The higher velocities and lower pressures found in the vertical skeletal types indicate a constriction of flow consistent with a narrowing of the airway.…”

Section: Discussionmentioning

confidence: 99%

“…Other anatomical factors exist that have an influence upon airway patency, but they are not fully understood. [25][26][27][28] The present study was designed to clarify the relationship between airway shape, craniofacial morphology, and the hyoid using i-CATH (Imaging Sciences International, Hatfield, Pa) CBCT images of adults that presented for orthodontic treatment. The specific aims were to (1) determine if the airway is laterally elliptical when the hyoid is lower, further back, angled, or smaller in width and (2) determine the correlation with vertical and horizontal facial morphology.…”

Section: Introductionmentioning

confidence: 99%

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The relationship of vertical skeletofacial morphology to oropharyngeal airway shape using cone beam computed tomography: Possible implications for airway restriction

Haskell¹,

Haskell

Spoon

et al. 2013

The Angle Orthodontist

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Objective: To determine if the shape of the oropharyngeal airway is related to the vertical morphology of the skeletofacial complex, including the hyoid bone. Materials and Methods: Cone beam computed tomography scans from 50 pretreatment adult orthodontic records were used to obtain skeletal and airway measurements. Linear regression statistics were used to compare soft tissue variables to hard tissue predictor variables. Results: Transverse airway widening was significantly increased when the distance between the hyoid and vertebrae was reduced; when the three-dimensional (3D) facial axis angle decreased (became more vertical); when the 3D mandibular plane angle increased; when the width of the hyoid increased, or when the calculated length of the geniohyoid decreased. Conclusions: A laterally elliptical airway-found when the face is more vertical and when the hyoid is closer to the cervical vertebrae-is hypothetically more resistant to collapse. Patients with a retrognathic, skeletal deep bite and a rounded oropharynx should be identified and corrected early to prevent potential airway problems. (Angle Orthod. 2014;84:548-554.)

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The relationship of vertical skeletofacial morphology to oropharyngeal airway shape using cone beam computed tomography: Possible implications for airway restriction

Haskell¹,

Haskell

Spoon

et al. 2013

The Angle Orthodontist

View full text Add to dashboard Cite

show abstract

“…9 Study design Only a few of the studies 9,12,21 were randomized, and a sample size of more than 30 was found in only 5 studies. 9,16,18,19,25 Accordingly, these studies should have had less bias in their measurements. In three articles, 10,16,27 the authors attempted to use reconstruction algorithms instead of commercial software.…”

Section: Discussionmentioning

confidence: 99%

“…Most articles analysed subjects with healthy upper airways. Five articles 7,12,23,25,26 analysed constricted airways of subjects with OSA. Studies by Lenza et al, 16 Cheng et al 10 and Celenk et al 27 did not report whether the analysed airway was that of a healthy subject or an OSA patient.…”

Section: Discussionmentioning

confidence: 99%

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Three-dimensional segmentation of the upper airway using cone beam CT: a systematic review

Alsufyani¹,

Flores-Mir²,

Major³

2012

Dentomaxillofacial Radiology

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The objectives of this study were to systematically review the literature for studies that used cone beam CT (CBCT) to automatically or semi-automatically model the upper airway (including the pharyngeal, nasal and paranasal airways), and to assess their validity and reliability. Several electronic databases (MEDLINEH, MEDLINE In-Process & Other NonIndexed Citations, all evidence-based medicine reviews including the Cochrane database, and Scopus) were searched. Abstracts that appeared to meet the initial selection criteria were selected by consensus. The original articles were then retrieved and their references were searched manually for potentially suitable articles that were missed during the electronic search. Final articles that met all the selection criteria were evaluated using a customized evaluation checklist. 16 articles were finally selected. From these, five scored more than 50% based on their methodology. Although eight articles reported the reliability of the airway model generated, only three used intraclass correlation (ICC). Two articles tested the accuracy/validity of airway models against the gold standard, manual segmentation, using volumetric measurements; however, neither used ICC. Only three articles properly tested the reliability of the three-dimensional (3D) upper airway model generated from CBCT and only one article had sufficiently sound methodology to test the airway model's accuracy/validity. The literature lacks proper scientific justification of a solid and optimized CBCT protocol for airway imaging. Owing to the limited number of adequate studies, it is difficult to generate a strong conclusion regarding the current validity and reliability of CBCT-generated 3D models.

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Orthodontic and Orthognathic Planning Using Cone Beam Computed Tomography

Cevidanes

Styner²,

Paniagua³

et al. 2013

Cone Beam Computed Tomography

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Evaluation of upper airway obstruction in Class II children with fluid-mechanical simulation

Cited by 52 publications

References 21 publications

The relationship of vertical skeletofacial morphology to oropharyngeal airway shape using cone beam computed tomography: Possible implications for airway restriction

The relationship of vertical skeletofacial morphology to oropharyngeal airway shape using cone beam computed tomography: Possible implications for airway restriction

Three-dimensional segmentation of the upper airway using cone beam CT: a systematic review

Orthodontic and Orthognathic Planning Using Cone Beam Computed Tomography

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