Accuracy of Predicting the Pharyngeal Airway Space on the Cephalogram After Mandibular Setback Surgery

Muto, Toshitaka; Yamazaki, A.; Takeda, Shigehiro; Sato, Yasunori

doi:10.1016/j.joms.2008.01.003

Cited by 12 publications

(11 citation statements)

References 20 publications

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“…However, results were not uniform, with one study finding no significant airway narrowing and two studies describing significant oropharyngeal narrowing after incisor retraction. Of the two studies with significant airway narrowing, one reported an oropharyngeal narrowing of 0.40 mm, well within the error of cephalometric airway measurements …”

Section: Discussionsupporting

confidence: 62%

“…All except one East Asian study reported airway dimensional reduction at the oropharynx and sometimes the hypopharynx as well as inferior and/or posterior movement of the hyoid bone after incisor retraction. However, the stated linear airway narrowing and hyoid bone movements in lateral cephalometric studies were small and comparable to the estimated 1.0 mm to 1.55 mm error of cephalometric airway measurements and the 1.02 mm to 2.16 mm error for hyoid measurements …”

Section: Discussionsupporting

confidence: 50%

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Effects of bicuspid extractions and incisor retraction on upper airway of Asian adults and late adolescents: A systematic review

Song

Yap

2019

J of Oral Rehabilitation

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ObjectivesThis systematic review aimed to assess the effects of bicuspid extractions and incisor retraction on airway dimension, hyoid position and breathing of adults and late adolescents.MethodsThe review was conducted according to PRISMA guidelines. Eight databases including PubMed, EMBASE, Web of Science and Scopus were searched to August 2018. Minimum age of participants was 16 years. The intervention was dual‐arch bicuspid extractions with incisor retraction. Outcomes were airway dimension, hyoid position and breathing assessment.ResultsAll nine publications meeting inclusion criteria were from Asia. They were divided into three Asian subregions. All East Asian lateral cephalometric studies reported anteroposterior airway narrowing at the oropharynx and sometimes the hypopharynx. However, the narrowing was small, comparable to measurement errors, and highly variable. Two out of three East Asian computed tomography (CT) studies described reductions in airway dimensions. The single functional breathing study showed increased simulated flow resistance after incisor retraction in East Asians. South Asian studies had mixed findings, with some reporting significant airway narrowing. The single study from West Asia found no significant airway or hyoid changes.ConclusionsAirway response to bicuspid extractions and incisor retraction varied substantially when assessed with cephalometry. CT measurements present larger effect sizes and smaller variations, providing stronger evidence of airway narrowing. Orthodontic extractions for incisor retraction may be more frequently indicated in Asia, and East Asians seem particularly susceptible to airway narrowing and postero‐inferior hyoid movement with incisor retraction. Better designed CT studies are needed for confirmation due to small effect size and large variability.

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Section: Discussionsupporting

confidence: 62%

Section: Discussionsupporting

confidence: 50%

Effects of bicuspid extractions and incisor retraction on upper airway of Asian adults and late adolescents: A systematic review

Song

Yap

2019

J of Oral Rehabilitation

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“…The postoperative PAS dimension was calculated from the change of C3-Me using 2 cephalometric radiographs taken before and 1 year after surgery. The equation used was PAS = −21.105 + 0.402 C3-Me (r = 0.854) [20]. In our study, the cervical vertebra showed strong correlation with pharyngeal airway changes at almost all levels and can be the good predictors for PAS.…”

Section: Tablementioning

confidence: 48%

“…Therefore, the usage of C3-B as a predictor is visually easy for the surgeon. In a previous study, the prediction equations are somewhat complicated with many predictors except the formula by Muto that used C3-Me as a predictor [20]. Compared to C3-B, C3-Me is less practical, because Me point is not involved in surgical planning.…”

Section: Tablementioning

confidence: 99%

Prediction of pharyngeal airway changes in skeletal class III deformity patients after orthognathic surgery

Nguyen

Visuttiwattanakorn

Wongsirichat

2015

Journal of Oral and Maxillofacial Surgery, Medicine, and Pathol

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“…Many studies examined changes in the pharyngeal airway size utilizing lateral cephalograms which allow two dimensional measurements of a three dimensional object, and measurements are taken in the sagittal or antero-posterior dimension [3,[4][5][6]12]. In order to better understand how the airway is affected, it is important to study the size and shape of the airway in both antero-posterior and lateral direction.…”

Section: Introductionmentioning

confidence: 99%

The “Rubber Band” and “Slingshot” Effects of the Posterior Airway Space in Mandibular Orthognathic Surgeries

Balakrishna

Reddy²,

Kashyap

et al. 2013

J. Maxillofac. Oral Surg.

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Introduction Mandibular surgeries are the most common orthognathic procedures that are undertaken. The pharyngeal airway space (PAS) is influenced by the changes in the sagittal changes of the mandible. Mandibular advancement surgeries are used to an advantage in obstructive sleep apnea cases to improve the airway space. On the contrary, there can be a considerable decrease in the airway space during mandibular setback procedures. Numerous studies have been conducted to study the effect of changes in the PAS during mandibular procedures. However, a combined radiographic and endoscopic analysis of the airway space has been sparsely done in recent literature Materials and methods Thirty-one patients with mandibular discrepancies who needed mandibular surgeries were chosen. The assessment of PAS was done using both lateral cephalograms and endoscopic examination. Results As lateral cephalograms can study only the twodimensional changes in the PAS, endoscopic examination both pre operatively and post operatively enabled the exact assessment of mandibular surgeries on the PAS. The PAS responds to setback mandibular surgery by modifying itself-called the ''Rubber band'' effect and in advancement surgeries as ''Slingshot effect''.

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Accuracy of Predicting the Pharyngeal Airway Space on the Cephalogram After Mandibular Setback Surgery

Cited by 12 publications

References 20 publications

Effects of bicuspid extractions and incisor retraction on upper airway of Asian adults and late adolescents: A systematic review

Effects of bicuspid extractions and incisor retraction on upper airway of Asian adults and late adolescents: A systematic review

Prediction of pharyngeal airway changes in skeletal class III deformity patients after orthognathic surgery

The “Rubber Band” and “Slingshot” Effects of the Posterior Airway Space in Mandibular Orthognathic Surgeries

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